Terminology as Topic
Polycyclic Hydrocarbons, Aromatic
A major group of unsaturated cyclic hydrocarbons containing two or more rings. The vast number of compounds of this important group, derived chiefly from petroleum and coal tar, are rather highly reactive and chemically versatile. The name is due to the strong and not unpleasant odor characteristic of most substances of this nature. (From Hawley's Condensed Chemical Dictionary, 12th ed, p96)
Receptors, Aryl Hydrocarbon
Cytoplasmic proteins that bind certain aryl hydrocarbons, translocate to the nucleus, and activate transcription of particular DNA segments. AH receptors are identified by their high-affinity binding to several carcinogenic or teratogenic environmental chemicals including polycyclic aromatic hydrocarbons found in cigarette smoke and smog, heterocyclic amines found in cooked foods, and halogenated hydrocarbons including dioxins and polychlorinated biphenyls. No endogenous ligand has been identified, but an unknown natural messenger with a role in cell differentiation and development is suspected.
National Institute of General Medical Sciences (U.S.)
Component of the NATIONAL INSTITUTES OF HEALTH. It conducts and supports basic biomedical research that is not targeted to specific diseases and funds studies on genes, proteins, and cells, as well as on fundamental processes like communication within and between cells and metabolism. It was established in 1962.
NIH 3T3 Cells
A continuous cell line of high contact-inhibition established from NIH Swiss mouse embryo cultures. The cells are useful for DNA transfection and transformation studies. (From ATCC [Internet]. Virginia: American Type Culture Collection; c2002 [cited 2002 Sept 26]. Available from http://www.atcc.org/)
United States Dept. of Health and Human Services
An autosomal recessive neurodegenerative disorder caused by the absence or deficiency of BETA-GALACTOSIDASE. It is characterized by intralysosomal accumulation of G(M1) GANGLIOSIDE and oligosaccharides, primarily in neurons of the central nervous system. The infantile form is characterized by MUSCLE HYPOTONIA, poor psychomotor development, HIRSUTISM, hepatosplenomegaly, and facial abnormalities. The juvenile form features HYPERACUSIS; SEIZURES; and psychomotor retardation. The adult form features progressive DEMENTIA; ATAXIA; and MUSCLE SPASTICITY. (From Menkes, Textbook of Child Neurology, 5th ed, pp96-7)
Property, such as patents, trademarks, and copyright, that results from creative effort. The Patent and Copyright Clause (Art. 1, Sec. 8, cl. 8) of the United States Constitution provides for promoting the progress of science and useful arts by securing for limited times to authors and inventors, the exclusive right to their respective writings and discoveries. (From Black's Law Dictionary, 5th ed, p1014)
Critical and exhaustive investigation or experimentation, having for its aim the discovery of new facts and their correct interpretation, the revision of accepted conclusions, theories, or laws in the light of newly discovered facts, or the practical application of such new or revised conclusions, theories, or laws. (Webster, 3d ed)
Flammable, amorphous, vegetable products of secretion or disintegration, usually formed in special cavities of plants. They are generally insoluble in water and soluble in alcohol, carbon tetrachloride, ether, or volatile oils. They are fusible and have a conchoidal fracture. They are the oxidation or polymerization products of the terpenes, and are mixtures of aromatic acids and esters. Most are soft and sticky, but harden after exposure to cold. (From Grant & Hackh's Chemical Dictionary, 5th ed & Dorland, 28th ed)
A plastic substance deposited by insects or obtained from plants. Waxes are esters of various fatty acids with higher, usually monohydric alcohols. The wax of pharmacy is principally yellow wax (beeswax), the material of which honeycomb is made. It consists chiefly of cerotic acid and myricin and is used in making ointments, cerates, etc. (Dorland, 27th ed)
Evidence of a cyclooxygenase-related prostaglandin synthesis in coral. The allene oxide pathway is not involved in prostaglandin biosynthesis. (1/176)Certain corals are rich natural sources of prostaglandins, the metabolic origin of which has remained undefined. By analogy with the lipoxygenase/allene oxide synthase pathway to jasmonic acid in plants, the presence of (8R)-lipoxygenase and allene oxide synthase in the coral Plexaura homomalla suggested a potential metabolic route to prostaglandins (Brash, A. R., Baertshi, S. W., Ingram, C.D., and Harris, T. M. (1987) J. Biol. Chem. 262, 15829-15839). Other evidence, from the Arctic coral Gersemia fruticosa, has indicated a cyclooxygenase intermediate in the biosynthesis (Varvas, K., Koljak, R., Jarving, I., Pehk, T., and Samel, N. (1994) Tetrahedron Lett. 35, 8267-8270). In the present study, active preparations of G. fruticosa have been used to identify both types of arachidonic acid metabolism and specific inhibitors were used to establish the enzyme type involved in the prostaglandin biosynthesis. The synthesis of prostaglandins and (11R)-hydroxyeicosatetraenoic acid was inhibited by mammalian cyclooxygenase inhibitors (indomethacin, aspirin, and tolfenamic acid), while the formation of the products of the 8-lipoxygenase/allene oxide pathway was not affected or was increased. The specific cyclooxygenase-2 inhibitor, nimesulide, did not inhibit the synthesis of prostaglandins in coral. We conclude that coral uses two parallel routes for the initial oxidation of polyenoic acids: the cyclooxygenase route, which leads to optically active prostaglandins, and the lipoxygenase/allene oxide synthase metabolism, the role of which remains to be established. An enzyme related to mammalian cyclooxygenases is the key to prostaglandin synthesis in coral. Based on our inhibitor data, the catalytic site of this evolutionary early cyclooxygenase appears to differ significantly from both known mammalian cyclooxygenases. (+info)
Biosynthesis of depudecin, a metabolite of Nimbya scirpicola. (2/176)Feeding experiments of labeled acetates to Nimbya scirpicola proved the carbon origin of the straight-chain polyketide, depudecin. Differential hydrogen exchange of the 2H label originating from 2H labeled acetate along the polyketide chain occurred. In particular, the deuterium of an epoxide methine at C-3 was lost to a substantial extent in the formation of depudecin. (+info)
Female Attacus atlas respond to pheromones of Antheraea polyphemus: a comparative electrophysiological and biochemical study. (3/176)Female Attacus atlas respond electrophysiologically to both of the Antheraea polyphemus pheromone components (E,Z)-6,11-hexadecadienyl acetate and (E,Z)-6,11-hexadecadienal. Moreover, they possess a pheromone-binding protein (PBP) and general odorant-binding proteins (GOBPs), as well as a pheromone-degrading sensillar esterase and aldehyde oxidase enzymes. They show no electroantennogram responses to their own gland extract. In contrast, female A. polyphemus do not respond to their own or to A. atlas pheromone. Male A. atlas do not detect any of the A. polyphemus compounds but only the conspecific female gland extracts. Both male A. atlas and female A. polyphemus possess PBP and GOBP but lack the pheromone-degrading esterases of male Antheraea. The results indicate that the two species use quite distinct classes of chemicals as pheromones. In spite of this, the N-terminal amino acid sequences of the PBPs show homology of 68%. (+info)
Using electroactive substrates to pattern the attachment of two different cell populations. (4/176)This report describes the development of an electroactive mask that permits the patterning of two different cell populations to a single substrate. This mask is based on a self-assembled monolayer of alkanethiolates on gold that could be switched from a state that prevents the attachment of cells to a state that promotes the integrin-mediated attachment of cells. Monolayers were patterned into regions having this electroactive monolayer and a second set of regions that were adhesive. After Swiss 3T3 fibroblasts had attached to the adhesive regions of this substrate, the second set of regions was activated electrically to permit the attachment of a second population of fibroblast cells. This method provides a general strategy for patterning the attachment of multiple cell types and will be important for studying heterotypic cell-cell interactions. (+info)
Activation and inhibition of the transduction process in silkmoth olfactory receptor neurons. (5/176)Electrophysiological responses of olfactory receptor neurons in both male and female silkmoths (Bombyx mori) were investigated. In both sexes, the G-protein activator sodium fluoride and 1,2-dioctanoyl-sn-glycerol, a membrane-permeable analog of the protein kinase C activator diacylglycerol, elicited nerve impulse responses similar to those elicited by weak continuous stimulation with odorants. Therefore, G(q)-proteins and diacylglycerol-activated ion channels seem to be involved in the transduction process in both pheromone-sensitive neurons in males and general odorant-sensitive neurons in females. Decyl-thio-trifluoro-propanone is known to inhibit electrophysiological responses of male moths to pheromones, but has no effect in females. Application of this inhibitor reduced the frequency, but not the amplitude of elementary receptor potentials. It had no inhibitory effect on nerve impulse responses elicited by sodium fluoride or 1,2-dioctanoyl-sn-glycerol. This supports the idea that decyl-thio-trifluoro-propanone acts on a prior step of the transduction cascade, e.g. on the pheromone receptor molecules. General odorants, such as (+/-)-linalool and 1-heptanol, excite olfactory receptor neurons in females, but inhibit the pheromone-sensitive neurons in males. Both (+/-)-linalool and 1-heptanol inhibited the responses of male neurons elicited by sodium fluoride or 1,2-dioctanoyl-sn-glycerol. (+/-)-Linalool reduced the amplitude of elementary receptor potentials. In contrast to decyl-thio-trifluoro-propanone, (+/-)-linalool and 1-heptanol seem to interfere with later processes of the transduction cascade, possibly the opening of ion channels. (+info)
A novel push-pull Diels-Alder diene: reactions of 4-alkoxy- or 4-phenylsulfenyl-5-chalcogene-substituted 1-phenylpenta-2,4-dien-1-one with electron-deficient dienophiles. (6/176)5-(phenylselenenyl)- and 5-(phenylsulfenyl)-4-ethoxy-1-phenyl-2,4-pentadien-1-ones (2) and (3) underwent [4+2] cycloaddition with N-methyl and N-phenylmaleimides and successive isomerization to give the 7-benzoyl-3a,4,5,7a-tetrahydro-1H-isoindole-1,3(2H)-diones 5, 8 and 9 in good yields. The 4-ethoxy group on the 2,4-pentadien-1-one was found to be effective to facilitate the cycloaddition with dienophiles. We also performed other [4+2] cycloadditions of 2,4-pentadien-1-ones with DMAD or naphthoquinone. (+info)
Adaptation in pheromone-sensitive trichoid sensilla of the hawkmoth Manduca sexta. (7/176)In extracellular tip recordings from long trichoid sensilla of male Manduca sexta moths, we studied dose-response relationships in response to bombykal stimuli of two different durations in the adapted and the non-adapted state. Bombykal-responsive cells could be distinguished from non-bombykal-sensitive cells in each trichoid sensillum because the bombykal-responsive cell always generated the action potentials of larger initial amplitude. The bombykal cell, which was recorded at a defined location within a distal flagellar annulus, can resolve at least four log(10)-units of pheromone concentrations but is apparently unable to encode all stimulus durations tested. Parameters of the amplitude-modulated sensillar potential and the frequency-modulated action potential responses were examined in different states of adaptation. Evidence is presented for the existence of several mechanisms of adaptation, which affect distinct steps of the transduction cascade. After adapting pheromone stimuli, the sensillar potential rises to a lower amplitude and declines faster compared with the non-adapted response. In addition, the frequency of the adapted action potential response is reduced. Only the time of rise of the sensillar potential is differentially affected by adapting pheromone stimuli of different duration. The time of rise does not increase after short, but only after long, adapting stimuli. Both short and long adapting stimuli shift the dose-response curves of the sensillar potential amplitude, as well as the initial slope of its rising phase, to higher stimulus concentrations by approximately one log(10)-unit. The shift in the dose-response curve of the action potential response is larger than for the sensillar potential response, suggesting that an additional adaptation mechanism acts at the level of action potential generation. Furthermore, a faster decline of the sensillar potential after short and long adapting stimuli suggests that the resting potential of the olfactory receptor neuron is stabilized. (+info)
Synthesis and characterization of hexadecadienyl compounds with a conjugated diene system, sex pheromone of the persimmon fruit moth and related compounds. (8/176)Hexadecadien-1-ol and the derivatives (acetate and aldehyde) with a conjugated diene system have recently been identified from a pheromone gland extract of the persimmon fruit moth (Stathmopoda masinissa), a pest insect of persimmon fruits distributed in East Asia. The alcohol and acetate showed their base peaks at m/z 79 in a GC-MS analysis by electron impact ionization, but the aldehyde produced a unique base peak at m/z 84, suggesting a 4,6-diene structure. To confirm this inference, four geometrical isomers of each 4,6-hexadecadienyl compound were synthesized by two different routes in which one of two double bonds was furnished in a highly stereoselective manner. Separation of the two isomers synthesized together by each route was facilely accomplished by preparative HPLC. Their mass spectra coincided well with those of natural components, indicating that they were available for use as authentic standards for determining the configuration of the natural pheromone. Furthermore, other hexadecadienyl compounds, including the conjugated diene system between the 3- and 10-positions, were synthesized to accumulate the spectral data of pheromone candidates. 5,7-Hexadecadienal interestingly showed the base peak at m/z 80; meanwhile, the base peaks of its alcohol and acetate were detected at m/z 79 like the corresponding 4,6-dienes. The base peaks of all 6,8-, 7,9-, and 8,10-dienes universally appeared at m/z 67 like 9,11-, 10,12-, and 13,15-dienes, the spectra of which have already been published. Although 3,5-hexadecadienal was not prepared, base peaks at m/z 67 and 79 were recorded for the alcohol and acetate, respectively. (+info)
Cooperative catalysis approach to intramolecular hydroacylation<...
TY - JOUR. T1 - Cooperative catalysis approach to intramolecular hydroacylation. AU - Beletskiy, Evgeny V.. AU - Chava, Sudheer. AU - Douglas, Christopher J. PY - 2012/7/20. Y1 - 2012/7/20. N2 - Prior examples of hydroacylation to form six- and seven-membered ring ketones require either embedded chelating groups or other substrate design strategies to circumvent competitive aldehyde decarbonylation. A cooperative catalysis strategy enabled intramolecular hydroacylation of disubstituted alkenes to form seven- and six-membered rings without requiring substrate-embedded chelating groups.. AB - Prior examples of hydroacylation to form six- and seven-membered ring ketones require either embedded chelating groups or other substrate design strategies to circumvent competitive aldehyde decarbonylation. A cooperative catalysis strategy enabled intramolecular hydroacylation of disubstituted alkenes to form seven- and six-membered rings without requiring substrate-embedded chelating groups.. UR - ...
Recent advances in transition metal-catalysed hydroacylation of alkene by Avipsa Ghosh, Kirsten F. Johnson et al.
This highlight discusses developments in transition metal-catalysed alkene and alkyne hydroacylation reactions over the past three years. The discussion summarizes the development of new catalyst systems for alkene and alkyne hydroacylation and applications to the synthesis of important ketone building blocks. The highlight captures transition metal-catalysed alkene and alkyne hydroacylation at a time of impressive growth when cobalt, nickel, ruthenium, and iridium catalysts are emerging as complements or replacements for traditional rhodium catalysts.
Hydroacylation of 1-alkene with heteroaromatic aldehyde by Rh(I) and additives<...
TY - JOUR. T1 - Hydroacylation of 1-alkene with heteroaromatic aldehyde by Rh(I) and additives. AU - Jun, Chul Ho. AU - Lee, Dae Yon. AU - Hong, Jun Bae. N1 - Funding Information: This study was supported in part by the Basic Science Research Institute Program, Ministry of Education (Project No. BSRI-96-3422) and the Korea Science and Engineering Foundation (Grant 961-0306-054-2). PY - 1997/9/22. Y1 - 1997/9/22. N2 - Hydroacylation of 1-alkene with a heteroaromatic aldehyde such as pyridinecarboxaldehyde, thiophenecarboxaldehyde and furfural derivatives under cocatalyst of Wilkinsons complex and 2-amino-3-picoline gave poor yield of hydroacylated product. The addition of a catalytic amount of bis(cyclopentadienyl)zirconium dichloride or bis(cyclopentadienyl)titanium dichloride as an additive dramatically increased the yield of the hydroacylated ketone product.. AB - Hydroacylation of 1-alkene with a heteroaromatic aldehyde such as pyridinecarboxaldehyde, thiophenecarboxaldehyde and furfural ...
Discount China Wholesale Piperine 99%(CAS#94-62-2) 20MG/vial, FREE SHIPPING [PTC-RP0-1561]- US$103.00 - Allcosmeticsource.com
Allcosmeticsource.com Piperine 99%(CAS#94-62-2) 20MG/vial, FREE SHIPPING [PTC-RP0-1561]- Piperine 99%(CAS#94-62-2) 20MG/vial, FREE SHIPPING CAS No.: 94-62-2 Specifications Formula:C17H19NO3 Molecular Weight:285.37 Deleted CAS:147030-08-8 Synonyms:1-[(2E,4E)-5-(1,3-benzodioxol-5-yl)penta-2,4-dienoyl]piperidine;FEMA No. 2909;Bioperine;Piperine (aliphatic);Piperidine, 1-((2E,4E)-5-(1,3-benzodioxol-5-yl)-1-oxo-2,4-pentadienyl)-;1-Piperoyl-piperidine;(E,E)-1-[5-(1,3-Benzodioxol-5-yl)-1-oxo-2,4-pentadienyl]-piperidine;Piperidine,1-[(2E,4E)-5-(1,3-benzodioxol-5- yl)-1-oxo-2,4-pentadienyl]-;N-[(E,E)-Piperoyl]piperidine;Piperidine, 1-(5-(1,3-benzodioxol-5-yl)-1-oxo-2,4-pentadienyl)-, (E,E)- (9CI); EINECS:202-348-0 Density:1.211 g/cm3 Melting Point:131-135 °C(lit.) Boiling Point:498.5 °C at 760 mmHg Flash Point:255.3 °C Solubility:40 mg/L (18 °C) inwater Appearance:slightly yellow powder Hazard Symbols:Xn Risk Codes:21/22 Safety:36/37 Details AvailableForms:Powder
Stereoselective allylboration of imines and indoles under mild conditions. An in situ E/Z isomerization of imines by...
This thesis is focused on two main areas of organic synthesis, palladium-catalyzed functionalization of alkenes and allylic alcohols, as well as development of new allylboration reactions.. We have developed a palladium-catalyzed selective allylic trifluoroacetoxylation reaction based on C−H functionalization. Allylic trifluoroacetates were synthesized from functionalized olefins under oxidative conditions. The reactions proceed under mild conditions with a high level of diastereoselectivity. Mechanistic studies of the allylic C−H trifluoroacetoxylation indicate that the reaction proceeds via (η3-allyl)palladium(IV) intermediate.. Palladium-catalyzed regio- and stereoselective synthesis of allylboronic acids from allylic alcohols has been demonstrated. Diboronic acid B2(OH)4 was used as the boron source in this process.. The reactivity of the allylboronic acids were studied in three types of allylboration reactions: allylboration of ketones, imines and acyl hydrazones. All three processes ...
Phthalides by rhodium-catalyzed ketone hydroacylation. - MySci...
Phthalides by rhodium-catalyzed ketone hydroacylation.: Phthalides are biologically relevant five-membered lactones found in herbs, fruits, and vegetables. Here
Rh-Catalyzed Enantioselective Diboration of Simple Alkenes: Reaction Development and Substrate Scope
Abstract. A rhodium-catalyzed enantioselective syn addition of bis(catecholato)diboron to simple alkenes in the presence of (S)-Quinap provides enantioenriched 1,2-diols after subsequent oxidation. The substrate scope, the reaction mechanism, and competing pathways are discussed.. ...
The effects of amine and acid catalysts on efficient chelation-assisted hydroacylation of alkene with aliphatic aldehyde -...
Fingerprint Dive into the research topics of The effects of amine and acid catalysts on efficient chelation-assisted hydroacylation of alkene with aliphatic aldehyde. Together they form a unique fingerprint. ...
ENHANCEMENT OF THE CYTOTOXIC ACTIVITY OF SOME α,β-UNSATURATED KETONES THROUGH AUXILIARY BINDING
The antineoplastic properties of α,β-unsaturated ketones, such as curcumin and related analogs, have been investigated for a number of years. Due to the high light sensitivity and the low bioavailability of curcumin and its analogs, there was a need to modify its structural features for clinical usage as a chemotherapeutic candidate. The emphasis on synthetic curcumin analogs which have the 1,5-diaryl-3-oxo-1,4-pentadienyl pharmacophore (Figure 2-1, page 32) and its importance for eliciting antineoplastic activity was made from this laboratory. It was proven that one way these agents exert their activity is through a thiol-alkylating mechanism. In order to increase the cytotoxic activity of these candidate agents, three target compounds containing the 1,5-diaryl-3-oxo-1,4-pentadienyl pharmacophore were designed by incorporating potential auxiliary binder groups (Figure 2-2, page 33). The auxiliary binders may display antineoplastic properties, or they may act only to enhance the bonding at the ...
Chapter 10 Conjugation in Alkadienes and Allylic Systems - PDF
. 0 onjugated Systems hapter 0 onjugation in Alkadienes and Allylic Systems onjugated systems are those in which a π-bond is connected or conjugated (from the Latin conjugare which means to link r yoke
Alkadienes, allylic systems, and pigments - The WikiPremed MCAT Course
A page within the free MCAT Learning Program produced by Wisebridge Learning Systems. The topic under discussion here is Alkadienes, allylic systems, and pigments - The WikiPremed MCAT Course
Mechanism of the C5 stereoinversion reaction in the biosynthesis of carbapenem antibiotics<...
TY - JOUR. T1 - Mechanism of the C5 stereoinversion reaction in the biosynthesis of carbapenem antibiotics. AU - Chang, Wei Chen. AU - Guo, Yisong. AU - Wang, Chen. AU - Butch, Susan E.. AU - Rosenzweig, Amy C.. AU - Boal, Amie K.. AU - Krebs, Carsten. AU - Bollinger, J. Martin. PY - 2014. Y1 - 2014. N2 - The bicyclic β-lactam/2-pyrrolidine precursor to all carbapenem antibiotics is biosynthesized by attachment of a carboxymethylene unit to C5 of L-proline followed by β-lactam ring closure. Carbapenem synthase (CarC), an Fe(II) and 2-(oxo)glutarate (Fe/2OG)-dependent oxygenase, then inverts the C5 configuration. Here we report the structure of CarC in complex with its substrate and biophysical dissection of its reaction to reveal the stereoinversion mechanism. An Fe(IV)-oxo intermediate abstracts the hydrogen (H•) from C5, and tyrosine 165, a residue not visualized in the published structures of CarC lacking bound substrate, donates H• to the opposite face of the resultant radical. The ...
中国科学院上海有机化学研究所机构知识库(SIOC OpenIR): Pd-catalyzed intramolecular aminofluorination of allylic sulfamides
A facile Pd-catalyzed intramolecular aminofluorination reaction of allylic sulfamides was developed that can be used to prepare fluorinated 1,3-diamine derivatives. Acetic acid was essential for regulation to give the major 6-endo cyclization products ...
1）Su, Y., Petersen, J. L.,Gregg, T. L.,Shi, X.*, Ambient 1,2,3-Triazole Ring Opening through Intermolecular Radical Addition to Vinyl-Triazole. Org. Lett., 2015, 17, 1208-1211.； 2）Dong, B.‡, Su, Y.‡, Ye, X., Petersen, J. L., Shi, X.*, Synthesis and Characterization of Fluorescent-Active Triazole-Gold Complexes. Sci. China Chem., 2015, 58, 1-4.； 3）Su, Y., Lu, M., Dong, B., Chen, H.*, Shi, X.* Silver Catalyzed Alkyne Activation: the Surprising Ligand Effect Adv. Syn. Cat., 2014, 356, 692-696.； 4）Su, Y., Zhang, Y., Akhmedov, N. G., Petersen, J. L., Shi, X.*, Ambient Intermolecular [2 + 2] Cycloaddition: An Example of Carbophilicity and Oxophilicity Competition in Au/Ag Catalysis. Org. Lett., 2014, 16, 2478-2481.； 5）Xi, Y.‡, Su, Y.‡, Yu, Z., Dong, B., McClain, E. J., Yu, L.*, Shi, X.*, Chemoselective Carbophilic Addition of α-Diazoesters through Ligand-Controlled Gold Catalysis. Angew. Chem. Int. Ed., 2014, 53, 9817-9821； 6) Su, Y.‡, Sun, X.‡, Wu, G., Jiao, ...
Asymmetric α-Photoalkylation of β-Ketocarbonyls by Primary Amine Catalysis: Facile Access to Acyclic All-Carbon Quaternary...
摘要. Merging photoredox catalysis and chiral primary amine catalysis enables the coupling of phenacyl radicals and enamine carbonyls to generate acyclic all-carbon quaternary centers with excellent enantioselectivity under visible light irradiation. See Luo and co-workers, p 14642. ...
N-Heterocyclic Carbene-Catalyzed Cascade Reaction Involving the Hydroacylation of Unactivated Alkynes
Cascade reaction - Wikipedia
A cascade reaction, also known as a domino reaction or tandem reaction, is a chemical process that comprises at least two consecutive reactions such that each subsequent reaction occurs only in virtue of the chemical functionality formed in the previous step. In cascade reactions, isolation of intermediates is not required, as each reaction composing the sequence occurs spontaneously. In the strictest definition of the term, the reaction conditions do not change among the consecutive steps of a cascade and no new reagents are added after the initial step. By contrast, one-pot procedures similarly allow at least two reactions to be carried out consecutively without any isolation of intermediates, but do not preclude the addition of new reagents or the change of conditions after the first reaction. Thus, any cascade reaction is also a one-pot procedure, while the reverse does not hold true. Although often composed solely of intramolecular transformations, cascade reactions can also occur ...
Download A Clinical Application Of Bions Concepts Volume 1 Dreaming Transformation Containment And Change
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Vibeke Henriette Lauridsen - Research outputs - Research - Aarhus University
Organocatalytic Formation of Chiral Trisubstituted Allenes and Chiral Furan Derivatives. / Poulsen, Pernille H.; Li, Yang; Lauridsen, Vibeke H.; Jørgensen, Danny K.B.; Palazzo, Teresa A.; Meazza, Marta; Jørgensen, Karl Anker.. In: Angewandte Chemie - International Edition, Vol. 57, No. 33, 13.08.2018, p. 10661-10665.. Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review ...
Platinum catalysed 1,4-diboration of α,β-unsaturated ketones<...
TY - JOUR. T1 - Platinum catalysed 1,4-diboration of α,β-unsaturated ketones. AU - Lawson, YG. AU - Lesley, MJG. AU - Marder, TB. AU - Norman, NC. AU - Rice, CR. PY - 1997. Y1 - 1997. M3 - Article (Academic Journal). SP - 2051. EP - 2052. JO - Chemical Communications. JF - Chemical Communications. SN - 1359-7345. ER - ...
Magnus Haugaard Rønne - Publikationer - Forskning - Aarhus Universitet
Ligand-Controlled Product Selectivity in Electrochemical Carbon Dioxide Reduction Using Manganese Bipyridine Catalysts. / Rønne, Magnus H.; Cho, Dasol; Madsen, Monica R.; Jakobsen, Joakim B.; Eom, Seunghwan; Escoudé, Émile; Hammershøj, Hans Christian D.; Nielsen, Dennis U.; Pedersen, Steen U.; Baik, Mu Hyun; Skrydstrup, Troels; Daasbjerg, Kim.. I: Journal of the American Chemical Society, Bind 142, Nr. 9, 03.2020, s. 4265-4275.. Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review ...
Highly facile and regio-selective synthesis of pyrazolo[1,5-a]pyrimidines via reactions of 1,2-allenic ketones with...
An efficient procedure for the syntheses of pyrazolo[1,5-a]pyrimidines through reactions of 1,2-allenic ketones with aminopyrazoles under extremely mild conditions without using any catalyst or promoter has been developed. The reactions showed excellent regio-selectivity with all the allenic ketone substrate
US6036890A - Diaryl-2H-naphthopyrans - Google Patents
Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their spacial structures, have a reduced tendency of the molecules to migrate in plastics.
A DFT study of endocyclic allenes: unprecedentedly superbasic hydrocarbons
A free platform for explaining your research in plain language, and managing how you communicate around it - so you can understand how best to increase its impact.
Stereoselective Synthesis of Monofluoroalkyl α,β-Unsaturated Ketones From Allenyl Carbinol Esters Mediated by Gold and...
see article for more reactions. Abstract. Allenyl carbinol esters isomerize to an E,Z mixture of the corresponding dienes in the presence of a gold catalyst. In a subsequent reaction with Selectfluor, this mixture can be converted to monofluoroalkyl α,β-unsaturated ketones with exclusive E selectivity in high yields.. ...
In this study, pericolic lymph nodes from individuals with an observed immune response to the central domain of p53 were used to construct recombinant antibody libraries. From these libraries, we were able to isolate a Fab with specificity for the central domain of p53. We subsequently showed that this antibody bound the denatured form of whole p53 and also recognized an epitope that was close to, or perhaps overlapped, the binding site of the murine antibody DO11 (181-190). This is the first report of the isolation of a human antibody to the central domain of p53, and highlights the ability of antibody phage display to isolate antibodies with novel reactivity to p53.. Approximately 10% of individuals in this study had serum antibodies to the central domain of p53, a frequency that is almost twice that found in previous studies of cancer patients (12 , 16 , 26) . There are a number of methodological differences in published studies that may account for this discrepancy. These include the type of ...
Stoichiometric and Catalytic Dimerization of Conjugated Dienes with (C|sub|5|/sub|R|sub|5|/sub|)Ru(diene)|sup|+|/sup| -...
Fingerprint Dive into the research topics of Stoichiometric and Catalytic Dimerization of Conjugated Dienes with (C,sub,5,/sub,R,sub,5,/sub,)Ru(diene),sup,+,/sup,. Together they form a unique fingerprint. ...
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The School-wide PBIS& PSM/RtI Link - ppt download
Session Objectives: Recognize the NHCS PBS-PSM/RtI Unified Plan Identify NHCS current Knowledge Creation Enterprises Critique the NHCS Unified Plan and Knowledge Creation Enterprises BT
2.4.2015 г. 1 Лекция 5 Алкадиени-класификация, строеж, изомерия, химични свойства, полимеризация на диени Органична химия Пантелей Денев Струпани Спрегнати Изо…
Preventing Chronic Cluster Headaches - Cluster Headache Pain Can Be Relieved | HowStuffWorks
Preventing Chronic Cluster Headaches - Cluster headache treatment can help you feel better. Learn great information on treating your cluster headaches from HowStuffWorks.
Revised ICHD-3 Criteria Identifies Distinct Features of Chronic Cluster Headache - Neurology Advisor
Revised criteria from the third edition of the International Classification of Headache Disorders (ICHD-3), can differentiate between chronic cluster headache (CCH) and episodic cluster headache (ECH) and may increase the number of CCH diagnoses.
Chronic cluster headache sufferer of 8yrs Esa failed assesment | OUCH(uk) - Cluster Headache Charity
Hi. Ive been a chronic cluster headache sufferer for around 10yrs. I was only diagnosed by a neurologist in 2012. Living by myself and unable to hold down employment due to my condition, i have claimed esa since 2013(won by tribunal appeal), and pip since 2015(also won by tribunal appeal).
intractable chronic cluster headache Archives - Reed Migraine Centers
by Reed Migraine Centers , Apr 21, 2018. Reed Migraine Centers - Founders and Inventors of the Omega Procedure , Reed Procedure , 4-Lead Procedure , » chronic cluster headache » Page 2 Click on the image to view the full file. FREE WEBINAR Learn more about the Reed and Omega migraine procedure treatment ...
Implantation of a sphenopalatine ganglion stimulation device for chronic cluster headache | NICE
Current evidence on the efficacy of implantation of a sphenopalatine ganglion stimulation device for chronic cluster headache, in the short term (up to 2 months), is adequate. With regard to safety, a variety of complications have been documented, most of which occur early and resolve; surgical revision of the implanted system is sometimes needed. Therefore, this procedure should only be used with special arrangements for clinical governance, consent and audit or research. ...
Ir(I)-catalyzed intermolecular regio- and enantioselective hydroamination of alkenes with heteroaromatic amines<...
TY - JOUR. T1 - Ir(I)-catalyzed intermolecular regio- and enantioselective hydroamination of alkenes with heteroaromatic amines. AU - Pan, Shiguang. AU - Endo, Kohei. AU - Shibata, Takanori. PY - 2012/2/3. Y1 - 2012/2/3. N2 - A cationic Ir(I)-C 3-TUNEPHOS complex catalyzed an intermolecular hydroamination of styrene derivatives with various heteroaromatic amines. The reaction gave Markovnikov products with perfect regioselectivity and good enantioselectivity under solvent-free conditions.. AB - A cationic Ir(I)-C 3-TUNEPHOS complex catalyzed an intermolecular hydroamination of styrene derivatives with various heteroaromatic amines. The reaction gave Markovnikov products with perfect regioselectivity and good enantioselectivity under solvent-free conditions.. UR - http://www.scopus.com/inward/record.url?scp=84856714192&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=84856714192&partnerID=8YFLogxK. U2 - 10.1021/ol203318z. DO - 10.1021/ol203318z. M3 - Article. C2 - ...
Percutaneous Bioelectric Current Stimulation for Chronic Cluster Heada | JPR
Percutaneous Bioelectric Current Stimulation for Chronic Cluster Headache – A Possible Transformative Approach to Cluster Headache
Palladium-Catalysed Construction of All-Carbon Quaternary Centres with Propargylic Electrophiles:Challenges in the Simultaneous...
This article describes the palladium-catalysed three-component coupling of 1,3-dicarbonyl compounds with nucleophiles and propargylic electrophiles for the generation of quaternary all-carbon centres in a single step, which necessitates the simultaneous control of regio-, chemo- and enantioselectivity. The use of propargyl enol carbonates, the source of two of the components, was found to be essential in maintaining high levels of regiocontrol and chemoselectivity, whereas a careful analysis of pKa trends of O-, C- and N-nucleophiles as the other coupling partner indicates that the highest levels of selectivity are likely to be obtained with relatively acidic species, such as phenols, 1,3-dicarbonyl compounds and aromatic N-heterocycles. Finally, studies towards the development of the catalytic enantioselective construction of quaternary all-carbon centres by means of alkenylation and allylic alkylation are disclosed.. ...
Bions, Protocells, Biogenesis, Pleomorphism and Genetics
In the early 1940s in Norway, while on the run from the Nazis, Wilhelm Reich was observing, via high-magnification microscopy, the disintegration of organic materials into small energy vesicles, which he called bions. These bions, upon further observation and as documented with time-lapse movies, would organize themselves into basic life forms such as amoeba and paramecia. Various control procedures, involving high temperature, pressurized sterilization, demonstrated the reality of this natural organization of protozoa. Reich came to believe that life did not originate only in some ancient, dark corner of history, but that life is being recreated every day, right under our noses, through the specific process of bionous disintegration and reorganization. He observed bions develop not only from organic materials, but also from inorganic materials as well. Before and since Reich, other scientists have also discovered what Reich called bions, giving them other names. However, Reich had one of the ...
Ligand-controlled palladium catalysis enables switch between mono- and di-arylation of primary aromatic amines with 2...
Herein, a wide range of mono- and di-arylated products were efficiently prepared from C-N coupling of 2-halobenzothiazoles and primary aromatic amines, and representative compounds 3b and 4b were further confirmed by X-ray crystallography. It was noteworthy that the di-arylated products, denoted as di(benzot
Monosubstituted alkene | Article about monosubstituted alkene by The Free Dictionary
Looking for monosubstituted alkene? Find out information about monosubstituted alkene. An alkene with the general formula RHC=CH2, where R is any organic group; only one carbon atom is bonded directly to one of the carbons of the... Explanation of monosubstituted alkene
Allenes as carbon nucleophiles in palladium-catalyzed reactions : Observation of anti attack of allenes on (pi-allyl)palladium...
In the palladium-catalyzed cyclization of allenic allylic esters using Pd(dba)2 as catalyst, it was shown that the allene acts as a carbon nucleophile. Intermediates were isolated and stereochemical studies established that the double bond of the allene has attacked the (π-allyl)palladium intermediate on the face opposite to that of palladium.. ...
Unprecedented Cu-Catalyzed Coupling of Internal 1,3-Diynes with Azides: One-Pot Tandem Cyclizations Involving 1,3-Dipolar...
A one-pot protocol for the synthesis of triazole-annulated polyheterocycles via metal-catalyzed coupling of internal 1,4-disubstituted 1,3-diynes and organic azides has been described. The mechanistic rationale for the reaction suggests tandem cycliz
Connectivity of an effective hypothalamic surgical target for cluster headache. - SCNi
The purpose of this study was to look at the connectivity of the posterior inferior hypothalamus in a patient implanted with a deep brain stimulating electrode using probabilistic tractography in conjunction with postoperative MRI scans. In a patient with chronic cluster headache we implanted a deep brain stimulating electrode into the ipsilateral postero-medial hypothalamus to successfully control his pain. To explore the connectivity, we used the surgical target from the postoperative MRI scan as a seed for probabilistic tractography, which was then linked to diffusion weighted imaging data acquired in a group of healthy control subjects. We found highly consistent connections with the reticular nucleus and cerebellum. In some subjects, connections were also seen with the parietal cortices, and the inferior medial frontal gyrus. Our results illustrate important anatomical connections that may explain the functional changes associated with cluster headaches and elucidate possible mechanisms responsible
Henley-In-Arden Medical Practice - Library - Health A-Z
If youve had cluster headaches for a long time and other treatments havent worked, surgery to implant a stimulation device may be recommended.. Under general anaesthetic, a small electrical device is implanted in a cavity in the side of your face. It emits electrical currents which stimulate an area of the parasympathetic nervous system thought to be associated with cluster headaches.. When you get a headache, you activate the device (up to a pre-determined maximum dose) by placing a handheld unit on your cheek over the place where the device is located.. As with TVNS, the aim of treatment is to relieve pain and reduce the frequency of cluster headache attacks.. NICE have recommended that the treatment is safe for short-term use (up to two months) under close specialist supervision.. For more information, read the NICE guidance about implantation of a sphenopalatine ganglion stimulation device for chronic cluster headache. ...
Hoffmann, R.; Tantillo, D. J. Angew. Chem. Int. Ed. 2003, 42, 5877-5882: Breaking Down Barriers: The Liaison Between Sigmatropic Shifts, Electrocyclic Reactions and 3-Center Cations. Ponec, R.; Bultinck, P.; Van Damme, S.; Carbo, R.; Tantillo, D. J. Theor. Chem. Acc. 2005, 113, 205-211: Geometric and Electronic Similarities between Transition Structures for Electrocyclizations and Sigmatropic Hydrogen Shifts. Tantillo, D. J. Annu. Rep. Prog. Chem., Sect. B 2006, 102, 269-289: Reaction Mechanisms. Part (ii) Pericyclic Reactions. Tantillo, D. J.; Lee, J. K. Annu. Rep. Prog. Chem., Sect. B 2007, 103, 272-293: Reaction Mechanisms. Pericyclic Reactions. Lee, J. K.; Tantillo, D. J. Annu. Rep. Prog. Chem., Sect. B 2008, 104, 260-283: Reaction Mechanisms. Pericyclic Reactions. Nouri, D. H.; Tantillo, D. J. Tetrahedron 2008, 64, 5672-5679: Sigmatropic Shifts and Cycloadditions on Neutral, Cationic, and Anionic Pentadienyl + Butadiene Potential Energy Surfaces. Tantillo, D. J. Angew. Chem. ...
Interview With Wayne Perry The Sinus Buster ! | Allentrepreneur
It all started in 1995 when I was traveling the country (US) advocating street style self defense. I produced a self-defense video teaching people how to use ordinary items and dirty tricks to defend themselves from criminal assaults. One of my gimmicks for getting publicity was to be sprayed with real police pepper spray. I ended up on the Oprah Winfrey show and I taught Oprah how to use self-defense pepper spray. After that show, I was bombarded with appearance requests from all over the country. Suddenly I was getting sprayed with pepper spray for small tv stations around the country while promoting my self defense videos. I had suffered from chronic cluster headaches and allergy problems for 20 years, but I never had a headache attack during one of my self defense demos. Then one day I was about to be sprayed by a television reporter at a local FOX News affiliate, and minutes before I had to go on the air I was hit with a cluster attack. Since the show had to go on, I let the reporter spray ...
PPT - HCS 446 Academic Coach/uophelp PowerPoint Presentation - ID:7237938
For more course tutorials visit\nwww.uophelp.com\n\nHCS 446 Week 1 Discussion Question 1\nHCS 446 Week 1 Discussion Question 2\nHCS 446 Week 1 Individual Assignment Facility Planning - Part I\nHCS 446 Week 2 Discussion Question 1 \nHCS 446 Week 2 Discussion Question 2 \nHCS 446 Week 2 Team Assignment Environmental Impact Outline\nHCS 446 Week 3 Discussion Question 1 \nHCS 446 Week 3 Discussion Question 2\nHCS 446 Week 3 Individual Assignment Facility Planning - Part II\nHCS 446 Week 4 Discussion Question 1\nHCS 446 Week 4 Discussion Question 2\nHCS 446 Week 4 Team Assignment Facility Planning - Part III\nHCS 446 Week 5 Discussion Question 1\nHCS 446 Week 5 Discussion Question 2\nHCS 446 Week 5 Team Assignment Environmental Impact Presentation\n\n\n Slideshow 7237938 by bagyanagar3
Enantioselective synthesis of bioactive molecules via metal-catalysed kinetic resolution of benzylic alcohols and azido...
Enantioselective synthesis of bioactive molecules via metal-catalysed kinetic resolution of benzylic alcohols and azido epoxides, alpha-aminoxylation of aldehydes and methodology involving diazidation of ...
Ruthenium-Catalyzed Alkene-Alkyne Coupling of Disubstituted Olefins: Application to the Stereoselective Synthesis of...
Ruthenium-Catalyzed Alkene-Alkyne Coupling of Disubstituted Olefins: Application to the Stereoselective Synthesis of Trisubstituted Enecarbamates
Difference between revisions of Smolke:Research - OpenWetWare
Researchers: Andrew Babiskin, Travis Bayer, Chase Beisel, Stephanie Culler, Katie Galloway, Kevin Hoff, Maung Nyan Win We are exploring the design strategies for constructing molecular switches that act in vivo as both biosensors and ligand-controlled regulators of gene expression in bacteria, yeast, and mammalian cell culture. Much of our effort is focused on the design of nucleic acid-based molecular sensors, although the design of some protein-based sensors is being explored as well. In the area of trans-acting molecular switches, we are exploring the design of sensors that act through diverse gene regulation mechanisms such as the RNA interference (RNAi) pathway, ribozyme-based cleavage, and the antisense pathway. In the area of cis-acting molecular switches, we are exploring the design of sensors that act through regulatory mechanisms such as alternative splicing, RNase III cleavage, ribozyme-based cleavage, and internal ribosome entry site (IRES) activity. In order to effectively monitor ...
Progress towards the synthesis of perophoramidine : formation of the contiguous quaternary centres
Perophoramidine 1 is a halogenated natural product which contains two contiguous quaternary centres within its structure. In this thesis, approaches towards the synthesis of perophoramidine are described. In particular, the synthesis of the tetracyclic core structure and the formation of the quaternary centres have been examined. In Chapter 1, the natural product perophoramidine 1 is introduced and its isolation, structure and biological activity is discussed. The structurally related communesin family of natural products are also introduced before the literature published on both the biosynthesis and laboratory synthesis of perophoramidine 1, is reviewed. Finally the Westwood groups approach towards the synthesis of perophoramidine 1 is introduced with a summary of non-halogenated model system investigations previously carried out within the group being provided. Chapter 2 describes studies towards the synthesis of an appropriately halogenated indolo[2,3-b]quinoline core structure of ...
Hydroamination via organocatalysis « Naturalproductmans Blog
Eric Jacobsen and co-workers published in JACS on a hydroamination using a thiourea catalyst. Its refreshing to see a hydroamination without a transition metal. JACS paper
Alkoxycarbonylation of allenes - regioselective switching by ligand « Naturalproductmans Blog
Matthias Beller and co-workers have reported in JACS on a ligand controlled regioselectivitiy switching of an alkoxycarbonylation of an allene substrate. JACS paper
Polynuclear lanthanide-diketonato clusters for the catalytic hydroboration of carboxamides and esters<...
TY - JOUR. T1 - Polynuclear lanthanide-diketonato clusters for the catalytic hydroboration of carboxamides and esters. AU - Tamang, Sem Raj. AU - Singh, Arpita. AU - Bedi, Deepika. AU - Bazkiaei, Adineh Rezaei. AU - Warner, Audrey A.. AU - Glogau, Keeley. AU - McDonald, Corey. AU - Unruh, Daniel K.. AU - Findlater, Michael. PY - 2019. Y1 - 2019. U2 - 10.1038/s41929-019-0405-5. DO - 10.1038/s41929-019-0405-5. M3 - Article. JO - Nature Catalysis. JF - Nature Catalysis. SN - 2520-1158. ER - ...
Bronsted Acids and Bases - CHEMISTRY COMMUNITY
Can someone pls explain how H2SO3 is a bronsted acid? I thought the sulfur could accept a proton with its lone pair making it a bronsted base but that is not correct. Thank you ...
Addition Of Halogen To Dienes Assignment Help
Get 24/7 Addition Of Halogen To Dienes Assignment Help / Homework Help Online from experts on Transtutors.com. ✓20% discount ✓100% Cashback* ✓4374+ Addition Of Halogen To Dienes Experts. Ask Now ! Get 100% error-free solutions at affordable prices
TDMS Study 93023-06 Pathology Tables
NTP Experiment-Test: 93023-06 INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a) Report: PEIRPT03 Study Type: CHRONIC 2,4-HEXADIENAL Date: 03/14/01 Route: GAVAGE Time: 15:11:34 FINAL#1/RATS Facility: Southern Research Institute Chemical CAS #: 142-83-6 Lock Date: 02/28/00 Cage Range: All Reasons For Removal: All Removal Date Range: All Treatment Groups: Include All a Number of animals examined microscopically at site and number of animals with lesion Page 1 NTP Experiment-Test: 93023-06 INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a) Report: PEIRPT03 Study Type: CHRONIC 2,4-HEXADIENAL Date: 03/14/01 Route: GAVAGE Time: 15:11:34 ____________________________________________________________________________________________________________________________________ FISCHER 344 RATS FEMALE 0 22.5 45 90 MG/KG/DY MG/KG/DY MG/KG/DY MG/KG/DY ____________________________________________________________________________________________________________________________________ ...
Enantioselective synthesis of atorvastatin
ALL ABOUT DRUGS BY DR ANTHONY MELVIN CRASTO, WORLD DRUG TRACKER HELPING MILLIONS, MILLION HITS ON GOOGLE..............................................
Professor John Bower - People in the School of Chemistry publications
Highly branch-selective, carbonyl-directed hydroarylations of monosubstituted alkenes are described. The chemistry relies upon a cationic Ir(I) catalyst modified with an electron deficient, wide bite angle bisphosphine ligand. This work provides a regioisomeric alternative to the Murai hydroarylation protocol.. Full details in the University publications repository. ...
PROCORE - France/Hong Kong Joint Research Scheme 2008/2009 Supported Applications
Development of anionic cascade reactions and other novel reactions of conjugated, acetylenic and allenic esters and thioesters. Toward the synthesis of biologically active ...
CHEMISTRY COMMUNITY - Search
If a compound has a proton it can donate it can act as a Bronsted acid. For example, HCO3 - can donate a proton and form CO3 2-. A compound can act as a Bronsted base if it can accept a proton, which it can only do if it has a lone pair of electrons it can donate. For example, HC03- can accept a pro ...
"3.4: Alkenes, Cycloalkenes, and Alkadienes". Chemistry LibreTexts. 2014-11-26. Retrieved 2021-03-20. "12.7: Cycloalkenes and ...
Friedrich, E. C.; Niyati-Shirkhodaee, F. (1991). "Regioselectivity and Solvent Effects in Cyclopropanation of Alkadienes". J. ...
"Cyclopentadiene Dimerization Kinetics in the Presence of C5 Alkenes and Alkadienes". Industrial & Engineering Chemistry ...
The A race produces alkadienes and alkatrienes (derivatives of fatty acids) wherein n is an odd number 23 through 31. The B ... see vegetable oil refining). Botryococcenes are preferred over alkadienes and alkatrienes for hydrocracking as botryococcenes ... The vast majority of these hydrocarbons are botryocuccus oils: botryococcenes, alkadienes and alkatrienes. Transesterification ...
The book also described 16 original methods of industrial synthesis and polymerization of dialkenes (alkadienes). In 1910s, ...
In systematic chemical nomenclature, alkynes are named with the Greek prefix system without any additional letters. Examples include ethyne or octyne. In parent chains with four or more carbons, it is necessary to say where the triple bond is located. For octyne, one can either write 3-octyne or oct-3-yne when the bond starts at the third carbon. The lowest number possible is given to the triple bond. When no superior functional groups are present, the parent chain must include the triple bond even if it is not the longest possible carbon chain in the molecule. Ethyne is commonly called by its trivial name acetylene.. In chemistry, the suffix -yne is used to denote the presence of a triple bond. In organic chemistry, the suffix often follows IUPAC nomenclature. However, inorganic compounds featuring unsaturation in the form of triple bonds may be denoted by substitutive nomenclature with the same methods used with alkynes (i.e. the name of the corresponding saturated compound is modified by ...
Alkadienes, allylic systems, and pigments - The WikiPremed MCAT Course
Chapter 10 Conjugation in Alkadienes and Allylic Systems - PDF
0 onjugated Systems hapter 0 onjugation in Alkadienes and Allylic Systems onjugated systems are those in which a π-bond is ... Conjugation in Alkadienes and Allylic Systems. Class Notes. B. The allyl group is both a common name and an accepted IUPAC name ... 1 . 0 onjugated Systems hapter 0 onjugation in Alkadienes and Allylic Systems onjugated systems are those in which a π-bond is ... Chapter 10 Conjugation in Alkadienes and Allylic Systems Chapter 10 suggested problems: I. The allyl group Class Notes A. B. ...
Stereochemistry, Bonding and Formation
Supercritical Algal Extracts: A Source of Biologically Active Compounds from Nature
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Brønsted acid catalyzed asymmetric propargylation of aldehydes.
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Patent US5182107 - Transferrin receptor specific antibody-neuropharmaceutical or diagnostic ... - Google Patents
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Publications] H.Ishii, et al.: Stereoselective Tandem Cyclization of l, l-Diphenyl-l, n-alkadienes via Photoinduced Electron ... Publications] H.Ishii, et al.: Stereoselective Tandem Cyclization of 1, 1-Diphenyl-1, n-alkadienes via Photoinduced Electron ... Publications] H.Ishii,et al.: Stereoselective Tandem Cyclization of 1,1-Diphenyl-1,n-alkadienes via Photoinduced Electron ...
US5085741A - Extractive distillation of low boiling alkene/alkane mixtures - Google Patents
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Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced...
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Get PDF - Characterization and distribution of the hydrocarbons found in diapausing pupae tissues of the tobacco hornworm,...
Patent US6431591 - Airbag sensor deactivator suitable for use in smart airbag system - Google Patents
Application # 2007/0122729. TONER, AND IMAGE FORMING METHOD, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE USING THE...
- Straight chain alkenes, alkadienes and alkatrienes from 23-44 C atoms were partially characterized. (eurekamag.com)
- Among the unsaturated cuticular hydrocarbons characteristic of queens, there were differences in amounts of alkenes/alkadienes between non-reproductive polygyne queens of different Gp-9 genotypes, between non-reproductive and reproductive queens, and between polygyne and monogyne reproductive queens, with the amounts increasing at a relatively higher rate through reproductive ontogeny in queens bearing the Gp-9 b allele. (eurekamag.com)
- The cuticle of physogastric queens presented a chemical profile that was distinct from all other groups in the analysis, with high relative abundances of alkenes and alkadienes with 27, 29, and 31 carbon atoms. (nih.gov)
- Their functional isomers are alkadienes and cyclo alkenes. (studymode.com)
- Thirty-six CHC components were scored in single fly extracts with carbon chain lengths ranging from C 29 to C 39 , including methyl-branched alkanes, n -alkenes, and alkadienes. (biomedcentral.com)
- Pyrolyzates of Botryococcus-related alginites are characterized by an abundance of normal alkadienes, alkenes, and alkanes. (montclair.edu)
- Eg: Alkenes, alkadienes and their derivatives. (myrank.co.in)
- Alkenes were the least prevalent, with alkadienes dominating the chromatographic landscape in the longer chain lengths. (storysteel.ml)
- Nomenclature Alkenes with more than one double bond are called alkadienes (2 double bonds) alkatrienes (3 double bonds) etc… Each double bond is designated by its lower-numbered carbon. (slidegur.com)
- Formation of palladium hydride and carbide phases in palladium-based catalysts is a critical process which changes the catalytic performance and selectivity of the catalysts in important industrial reactions, such as selective hydrogenation of alkynes or alkadienes. (rsc.org)
- Part 2C: alkadienes and alkynes. (esdu.com)
- In general, 2-alkynes rearrange faster than 3-alkynes, and 1,2-alkadienes (allenes) rearrange faster than 2-alkynes. (stackexchange.com)
- En.wikipedia.org The boiling points of the pentane isomers range from about 9 to 36 °C. As is the case for other alkanes, the more thickly branched isomers tend to have lower boiling points. (lawandicome.co)
- A convenient one-pot synthesis of 1,3-cyclo-alkadienes via a regioselective dehydrogenation of the corresponding cycloalkenes has been developed recently by the group of Professor Yoshiharu Iwabuchi from Tohoku University (Japan). (thieme.de)
- 1 . 0 onjugated Systems hapter 0 onjugation in Alkadienes and Allylic Systems onjugated systems are those in which a π-bond is connected or conjugated (from the Latin conjugare which means to link r yoke together) to another system that contains either a p-orbital or another π-bond. (docplayer.net)
- Linear unsaturated hydrocarbons containing two double bonds are referred to as dienes , diolefins or alkadienes . (libretexts.org)
- belongs to the class of organic compounds known as alkadienes. (t3db.ca)
- In the lipoxygenase (LOX) oriented part, the potential of the soybean isoenzyme L-1 for the regio- and enantioselective dioxygenation of phenolic 1,4-(Z,Z)-alkadienes and -alkatrienes was studied. (uni-wuerzburg.de)
- Alkene, alkadienes and their derivatives are used as monomers. (corrosionpedia.com)
- This strategy is not limited to the oxidation of diols, but can be extended to the site‐selective reaction of many similar multifunctional linear molecules, such as the reduction of alkadienes. (ntu.edu.sg)