TY - JOUR. T1 - Coordination and adsorption of acetylene in the poly[(vinylcyclopentadienyl)manganese] membrane. AU - Kawakami, Hiroyoshi. AU - Tsuda, Kenji. AU - Nishide, Hiroyuki. AU - Tsuchida, Eishun. PY - 1991/1/1. Y1 - 1991/1/1. N2 - A copolymer of (vinylcyclopentadienyl)dicarbonylmanganese (CpMn) and octyl methacrylate forms its acetylene-coordinated complex reversibly and stably in the solvent-free membrane state. Kinetic and equilibrium constants of the acetylene coordination to the CpMn residue in the copolymer membrane are determined spectroscopically in situ. The acetylene coordination parameters are much smaller than those of the corresponding nitrogen coordination. Acetylene transport for the membrane is expected to be selectively augmented due to the coordination of acetylene to the fixed CpMn. However, acetylene transport behavior is in accordance with total immobilization of acetylene on the CpMn residue in the acetylene permeation through the membrane.. AB - A copolymer of ...

TY - JOUR. T1 - Coordination and adsorption of acetylene in the poly[(vinylcyclopentadienyl)manganese] membrane. AU - Kawakami, Hiroyoshi. AU - Tsuda, Kenji. AU - Nishide, Hiroyuki. AU - Tsuchida, Eishun. PY - 1991/1/1. Y1 - 1991/1/1. N2 - A copolymer of (vinylcyclopentadienyl)dicarbonylmanganese (CpMn) and octyl methacrylate forms its acetylene-coordinated complex reversibly and stably in the solvent-free membrane state. Kinetic and equilibrium constants of the acetylene coordination to the CpMn residue in the copolymer membrane are determined spectroscopically in situ. The acetylene coordination parameters are much smaller than those of the corresponding nitrogen coordination. Acetylene transport for the membrane is expected to be selectively augmented due to the coordination of acetylene to the fixed CpMn. However, acetylene transport behavior is in accordance with total immobilization of acetylene on the CpMn residue in the acetylene permeation through the membrane.. AB - A copolymer of ...

Shifts in the electronic transitions for the complexes of phenylacetylene with ammonia, methylamine, and triethylamine clearly indicate the variation in the intermolecular structures of the three complexes. The infrared spectrum of phenylacetylene in the, acetylenic C-H stretching region shows Fermi resonance bands, which act as a sensitive tool to probe the intermolecular structures. The IR-UV double resonance spectra of the three complexes are disparate and signify the formation of distinct structures. The formation of C-H center dot center dot center dot N hydrogen-bonded complex with ammonia and two distinct types of c complexes with methylamine and triethylamine can be inferred from the analysis of electronic and vibrational spectra in combination with ab initio calculations. These complexes clearly point out the fact that marginal changes in the interacting partner can significantly alter the intermolecular structure ...

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TY - JOUR. T1 - Electronic Selectivity Tuning in Titanium(III)-Catalyzed Acetylene Cross-Dimerization Reactions. AU - Oshovsky, Gennady V.. AU - Hessen, Bart. AU - Reek, Joost N. H.. AU - de Bruin, Bas. PY - 2011/11/28. Y1 - 2011/11/28. N2 - The reactivity of open-shell titanium(III) complexes in organometallic catalysis is associated with many open questions, in particular regarding the electronic structure of catalytic intermediates and transition states. The unpaired electron density in principle allows for radical-type reactivity, while at the same time empty d orbitals allow more traditional cis-coordination insertion pathways. In this paper we investigated the (Cp*)(2)Ti-III-catalyzed cross-dimerization of aliphatic and aromatic acetylenes, focusing on the reactivity of two different aliphatic acetylenes with a series of different aromatic acetylenes. The applied aliphatic acetylenes 1a (4-methylpent-1-yne) and 1b (N,N-dimethyl-N-propargylamine) have the same size but different ...

Looking for acetylenes? Find out information about acetylenes. or , HC≡CH, a colorless gas. It melts at −80.8°C; and boils at −84.0°C;. Offensive odors often noted in commercial acetylene are due to impurities.... Explanation of acetylenes

Fingerprint Dive into the research topics of Palladium-Catalyzed Addition and Carbonylative Addition of Diaryl Disulfides and Diselenides to Terminal Acetylenes. Together they form a unique fingerprint. ...

TY - JOUR. T1 - Measurement of cardiac output during exercise by open-circuit acetylene uptake. AU - Barker, Rebecca C.. AU - Hopkins, Susan R.. AU - Kellogg, Nancy. AU - Olfert, I. Mark. AU - Brutsaert, Tom D. AU - Gavin, Timothy P.. AU - Entin, Pauline L.. AU - Rice, Anthony J.. AU - Wagner, Peter D.. PY - 1999/10. Y1 - 1999/10. N2 - Noninvasive measurement of cardiac output (Q̇T) is problematic during heavy exercise. We report a new approach that avoids unpleasant rebreathing and resultant changes in alveolar PO2 or PCO2 by measuring short-term acetylene (C2H2) uptake by an open-circuit technique, with application of mass balance for the calculation of Q̇T. The method assumes that alveolar and arterial C2H2 pressures are the same, and we account for C2H2 recirculation by extrapolating end-tidal C2H2 back to breath 1 of the maneuver. We correct for incomplete gas mixing by using He in the inspired mixture. The maneuver involves switching the subject to air containing trace amounts of C2H2 ...

The increasing threats of global warming, rapid depletion of fossil fuels, and increasing energy demands are driving an enormous amount of research into clean renewable sources of energy, flue gas capture technologies, and environmentally friendly energy storage devices, to name a few. Activated carbons present a multipurpose material commonly used in many of these increasingly popular green technologies. A wide range of cross-linked acetylenic polymers of phenylacetylene and 1,3- diethynylbenzene were synthesized and investigated in this thesis to generate materials for electrochemical double layer capacitors, CO2 capture, and hydrogen storage. Chemical activation of the copolymers in the presence of KOH was shown to produce highly microporous carbons with various textural properties. The specific cross-linking densities of the polymer precursors prior to carbonization were shown to greatly affect the carbon yield, surface area, pore volumes and pore sizes of the carbons produced. ...

Acetylene is not especially toxic, but when generated from calcium carbide, it can contain toxic impurities such as traces of phosphine and arsine, which give it a distinct garlic-like smell. It is also highly flammable, as are most light hydrocarbons, hence its use in welding. Its most singular hazard is associated with its intrinsic instability, especially when it is pressurized: under certain conditions acetylene can react in an exothermic addition-type reaction to form a number of products, typically benzene and/or vinylacetylene, possibly in addition to carbon and hydrogen.[citation needed] Consequently, acetylene, if initiated by intense heat or a shockwave, can decompose explosively if the absolute pressure of the gas exceeds about 200 kilopascals (29 psi). Most regulators and pressure gauges on equipment report gauge pressure, and the safe limit for acetylene therefore is 101 kPagage, or 15 psig.[42][43] It is therefore supplied and stored dissolved in acetone or dimethylformamide ...

TY - JOUR. T1 - Synthesis of new vinylsilanes containing an asymmetric silicon via platinum catalyzed hydrosilylation of acetylene and monosubstituted alkynes. AU - Gevorgyan, Vladimir. AU - Borisova, Larisa. AU - Popelis, Juris. AU - Lukevics, Edmunds. AU - Foltynowicz, Zenon. AU - Gulinski, Jacek. AU - Marciniec, Bogdan. PY - 1992/2/4. Y1 - 1992/2/4. N2 - A series of new racemic vinylsilanes has been obtained by hydrosilylation reaction of acetylene and monosubstituted alkynes with (±)-α-NpPhMeSiH and (±)-N(CH2CH2O)3SiCH2PhMeSiH in the presence of platinum-containing catalysts.. AB - A series of new racemic vinylsilanes has been obtained by hydrosilylation reaction of acetylene and monosubstituted alkynes with (±)-α-NpPhMeSiH and (±)-N(CH2CH2O)3SiCH2PhMeSiH in the presence of platinum-containing catalysts.. UR - http://www.scopus.com/inward/record.url?scp=0002291907&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0002291907&partnerID=8YFLogxK. U2 - ...

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This paper demonstrates an acetylene gas sensor based on an Ag-decorated tin dioxide/reduced graphene oxide (Ag-SnO2/rGO) nanocomposite film, prepared by layer-by-layer (LbL) self-assembly technology. The as-prepared Ag-SnO2/rGO nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectrum. The acetylene sensing properties were investigated using different working temperatures and gas concentrations. An optimal temperature of 90 °C was determined, and the Ag-SnO2/rGO nanocomposite sensor exhibited excellent sensing behaviors towards acetylene, in terms of response, repeatability, stability and response/recovery characteristics, which were superior to the pure SnO2 and SnO2/rGO film sensors. The sensing mechanism of the Ag-SnO2/rGO sensor was attributed to the synergistic effect of the ternary nanomaterials, and the heterojunctions created at the interfaces between SnO2 and rGO. This work indicates that the Ag

A nitrogen-fixing bacterium, designated strain 6H33bT, was isolated from a compost pile in Japan. The nitrogenase activity of this strain was detected based on its acetylene-reducing activity under low oxygen concentrations (2-4 %). An analysis of the genes responsible for nitrogen fixation in this strain, nifH and nifD, indicated a close relationship to those of Pseudomonas stutzeri A15 (A1501). Sequence similarity searches based on the 16S rRNA gene sequences showed that strain 6H33bT belongs within the genus Pseudomonas sensu stricto; closest similarity was with Pseudomonas indica (97·3 %). A comparison of several taxonomic characteristics of 6H33bT with those of P. indica and some type strains of the genus Pseudomonas sensu stricto indicated that 6H33bT could be distinguished from P. indica based on the presence of nitrogen fixation ability, the absence of nitrate reduction and denitrification abilities and the utilization of some sugars and organic acids. Phylogenetic analyses and the results of

article{2da3f822-7032-422c-900e-e4a29654ecd9, abstract = {,p,Pure rotational coherent anti-Stokes Raman scattering (CARS) experiments have been performed in acetylene for temperatures ranging from 294 to 582 K, and in mixtures of acetylene and nitrogen in the mole fraction range of 0.06-0.32 for acetylene at room temperature. The experimental spectra are evaluated by a least-square fitting to libraries of theoretically calculated spectra using two different Raman linewidth models, one with and one without dependence on the rotational quantum number J. It is found that a J-dependent model is favourable, both regarding temperature measurements in pure acetylene, and simultaneous acetylene concentration and temperature measurements in different mixtures of acetylene and nitrogen. For the temperature measurements performed in pure acetylene the temperature inaccuracy is generally less than 2% when the J-dependent model for the Raman linewidths is used. It is found that fitting the value of the ...

Course 1 and 2, Version 1: Upon successful completion of the course, students will be able to: set up and test oxygen and acetylene cylinders and accessory equipment; perform basic cutting; cut freehand, guide and bevel; identify all safety regulations for cutting and welding; identify common causes and types of boiler tube failure; and perform tube repairs and tube rolling procedures. Course 1 and 2: Version 2 and Course 1 and 2: Version 3: Same as Version 1; in addition: demonstrate proper transporation and securement methods for oxygen and acetylene cylinders; demonstrate inspection requirements for oxygen and acetylene; state the normal pressure for oxygen and acetylene cylinders; describe the construction of oxygen and acetylene cylinders; identify the parts of oxygen and acetylene regulators; describe the function and operation of fusible plugs in acetylene cylinders and safety discs in oxygen cylinders; select the appropriate cutting tip for the application; demonstrate how to adjust ...

B.4.3.3.5 Physisorption and Desorption of Nonsolvent Molecules. Since there is one acetylene molecule for every ~59 n-octane molecules in the hydrocarbon feedstock solution, the possible physisorption of solvated acetylene molecules from the external solvent bath to the piston cavity passivated diamond walls must also be evaluated. Experiments [3189] on the physisorption of acetylene on the diamond C(111)-H(1x1) surface from gas phase show that the C2H2 molecule adsorbs nearly flat on terraces but is slightly tilted on defect sites, covering four surface hydrogens. This in-plane orientation of the acetylene monolayer is not unexpected because C2H2 has high p electron density around the C=C triple bond, the most energetically favorable position to be attacked by hydrogen-containing species to form a hydrogen bond, and because electrostatic interactions also favor the horizontal orientation of C2H2 on the diamond surface.. Will n-octane or acetylene be preferentially adsorbed on the passivated ...

Acetylene is a weak acid, but not nearly as weak as alkanes or alkenes. CompoundpK a HF3.2 H 2 O16 NH CH 4 60 H2CH2CH2CH2C CH 2 HCCH 26 Acetylene

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The report generally describes 1-phenyl-2-(trimethylsilyl)-acetylene, examines its uses, production methods, patents. 1-Phenyl-2-(trimethylsilyl)-acetylene

Team WashU_StLouis The production of a bio-fertilizer could benefit the agricultural industry by decreasing the need for energy intensive nitrogen fixation processes. The nif cluster of Cyanothece 51142 consists of 29 genes that construct and regulate a nitrogenase protein complex, which catalyzes the fixation of atmospheric nitrogen. This year, our iGEM team aims to harness the power of nif to produce ammonia in Escherichia coli. After synthesizing a nif- containing plasmid (34 kbp) using the DNA assembler method (Shao et al 2009) and transforming that plasmid into E. coli, our team tested for nitrogenase activity using the acetylene reduction assay. The transformed E. coli were then compared to wild-type under limited nitrogen conditions to check for a competitive advantage. Future tests will evaluate the expression of various nitrogenase subunits, such as nifD and nifK. Our team also aims to further characterize the promoter sequences of the Cyanothece 51142 nif cluster. Between the cysE and ...

Sampling days in the field have been long yet extremely productive. We have collected nitrogen fixation data on primary producers found in four streams with varying temperatures. We can calculate the rate that primary producers are fixing nitrogen using a technique called Acetylene Reduction Assay or ARA. This is one method of measuring fixation which allows us to compare how rates of fixation change across a temperature gradient. You may be thinking Whoa! Back up. What is this girl talking about? Let me explain. Some primary producers, for example, one of my favorites, Nostoc Pink, can take nitrogen gas (N2), which is abundant in the air, and utilize the nitrogen for growth and other critical cellular processes. But for the organism to use the nitrogen from N2 gas, it must be converted into a usable form of nitrogen. One particular enzyme known as nitrogenase allows for some organisms to be able to do just that! This enzyme breaks the bonds in N2 gas, or as we call it, fixes N2 gas, and ...

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A crossed beam investigation of the reactions of tricarbon molecules, C(3)(X(1)Sigma(+)(g)),with acetylene, C(2)H(2)(X(1)Sigma(+)(g)), ethylene, C(2)H(4)(X(1)A(g)), and benzene, C(6)H(6)(X(1)A(1g)) Article ...

An aqueous slurry composition which is curable at saturated steam pressure and temperature of 360.degree. to 400.degree. F to form a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising lime, crystalline silica, and a thickening agent selected from the group consisting of (a) polyethylene oxide, (b) amorphous glassy silica, (c) a soluble salt of phosphate and a soluble salt of calcium and (d) a soluble salt of phosphate and a neutralizing acid.

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The balanced equation for the combustion of acetylene is 2 H2C2 + 5 O2 ? 4 CO2 + 2 H2O. A combustion reaction occurs when a compound merges with oxygen to release heat in an exothermic...

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GEL COLLOIDAL .........................252/315.1+ MISC CHEMICAL MANUFACTURE ........156/DIG.108 RADIOACTIVE .......................252/634 SILICA ............................423/334+ GEL ROUTE TO GLASS MAKING ........... 501/12 GELATINE ............................ 530/354 JELLIES ...........................426/576 GEMS ................................ 63/32 ARTIFICIAL ........................501/86 CHANGING COLOR BY RADIATION .......378/38 DESIGN ............................D11/89+ SETTING METHODS AND APPARATUS .....29/10 SETTINGS ..........................63/26+ GENEALOGICAL CHARTS TEACHING ..........................434/154+ GENERATOR MOTOR ..................... 310/113 GENERATORS (SEE STEAM, GENERATORS) .. D13/112 ACETYLENE .........................48/1 ACETYLENE .........................48/2 ACETYLENE .........................48/3.R ACETYLENE .........................48/4+ CHEMICAL ..........................422/198+ CHEMICAL PRESSURE IN FIRE EXTINGUISHER ...................169/6+ COMBUSTIBLE ...

Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide ...

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div class=citation vocab=http://schema.org/,,i class=fa fa-external-link-square fa-fw,,/i, Data from ,span resource=http://link.lib.byu.edu/resource/v_CbHZjm-Y0/ typeof=Enumeration http://bibfra.me/vocab/lite/Topic,,span property=name http://bibfra.me/vocab/lite/label,,a href=http://link.lib.byu.edu/resource/v_CbHZjm-Y0/,Acetylene,/a,,/span, - ,span property=offers typeOf=Offer,,span property=offeredBy typeof=Library ll:Library resource=http://link.lib.byu.edu/,,span property=name http://bibfra.me/vocab/lite/label,,a property=url href=http://link.lib.byu.edu/,Brigham Young University,/a,,/span,,/span,,/span,,/span,,/div ...

Follow these practical tips and guidelines to mitigate or eliminate the risk of injury to themselves or others when transporting and handling acetylene.

A common use of ethyne, also called acetylene, is as a fuel in welding. An acetylene flame can reach temperatures of close to 6,000 degrees Fahrenheit. Acetylene is also used for making carbon...

Marcelo Godoi, Eduardo W. Ricardo, Tiago E. Frizon, Manuela S.T. Rocha, Devender Singh, Márcio W. Paixão, Antonio Luiz Braga, An efficient synthesis of alkynyl selenides and tellurides from terminal acetylenes and diorganyl diselenides or ditellurides catalyzed by recyclable copper oxide nanopowder, Tetrahedron, 2012, 68, 51, ...

The catalytic performance of triazolyl-based molecular gels was investigated in the Huisgen 1,3-dipolar cycloaddition of alkynes and azides. Low-molecular-weight gelators derived from l-valine were synthesized and functionalized with a triazole fragment. The resultant compounds formed gels either with or without copper, in a variety of solvents of different polarity. The gelators coordinated CuI and exhibited a high catalytic activity in the gel phase for the model reaction between phenylacetylene and benzylazide. Additionally, the gels were able to participate in autocatalytic synthesis and the influence of small structural changes on their performance was observed. [-] ...

Two distinct isomers for the binary complex between phenylacetylene and methylamine were observed. The first complex is characterized by the presence of a C-H center dot center dot center dot N hydrogen bond between the acetylenic C-H group and the N atom of methylamine. In the second complex the N-H group of methylamine interacts with the pi electron density of the benzene ring accompanied by a peripheral interaction between the methyl C-H group and the pi electron density of the C C bond. Stabilization energies and Gibbs free energies at the complete basis set (CBS) limit of the coupled cluster theory with single, double, and perturbative triple excitations [CCSD(T)] suggest that while the C-H center dot center dot center dot N hydrogen bonded complex is the global minimum, the N-H center dot center dot center dot pi hydrogen bonded complex is a high energy local minimum. The formation of the N-H center dot center dot center dot pi complex could be related to kinetic trapping or higher ...

IspH owes its flexibility to the structure and location of its active site. The enzyme is composed of three structural units that harbor a cubic iron-sulfur cluster at their center. This unusual structure enables the enzyme to accomplish a challenging reaction: converting an allyl alcohol to a mixture of the two isoprene components. While iron-sulfur proteins normally act as electron transmitters (deoxidation and oxidation respectively), the IspH enzyme binds the substrate directly to the iron-sulfur cluster. Basis for industrial applications Apart from acetylene hydratase and nitrogenase, IspH is just the third enzyme known to convert acetylene compounds. In addition, until now there were no known iron-containing catalysts that could carry out this reaction. Thus the newly discovered property of IspH could enable the development of new active pharmaceutical ingredients, particularly for the battle against malaria and tuberculosis ...

An organic compound with the formula C2H2 or HCCH. The first member of the alkynes, acetylene is a gas with a narrow liquid range; the triple point is −81°C (−114°F). The heat of formation (ΔH°f ) is +227 kilojoules/mole, and acetylene is the most ...

TY - JOUR. T1 - Short exposure to acetylene to distinguish between nitrifier and denitrifier nitrous oxide production in soil and sediment samples. AU - Kester, R.A.. AU - De Boer, W.. AU - Laanbroek, H.J.. N1 - Reporting year: 1996 Metis note: 2141; CTE; TME ; ME file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1996/Kester_ea_2141.pdf. PY - 1996. Y1 - 1996. N2 - The contribution of nitrifiers and denitrifiers to the nitrous oxide production in slurries of calcareous silt loam and river bank sediment at different oxygen concentrations was determined using acetylene as nitrification inhibitor. The addition of 10 Pa acetylene resulted in inhibition of nitrous oxide production at oxic conditions, but strongly enhanced the nitrous oxide production at oxygen-poor and anoxic conditions. Inhibition of nitrification by short exposure (1 to 24 h) to high concentrations of acetylene (100 Pa to 10 kPa) was tested using the same samples. After the removal of acetylene, nitrification was inhibited almost ...

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TY - JOUR. T1 - Nanostructure and high-rate discharge-charge property of manganese oxide/acetylene black nanocomposite synthesized by sonochemical method. AU - Kawaoka, Hirokazu. AU - Hibino, Mitsuhiro. AU - Zhou, Haoshen. AU - Honma, Itaru. PY - 2005/2/14. Y1 - 2005/2/14. N2 - Nanostructure and high-rate discharge-charge capacities were investigated for the manganese oxide/acetylene black (AB) nanocomposites fabricated by sonication from aqueous solutions containing permanganate ion. Coating structure in which the acetylene black particles were uniformly coated with manganese oxide was successfully prepared from a pH=10 solution. On the other hand, acicular and tabular birnessite crystals were observed in samples obtained from pH,1 solutions, although the formation rate of manganese oxide in the pH,1 solution was much faster than that in the pH=10 solution. The sample from the pH=10 solution could be discharged and charged under high current density, such as 10 A g -1, because of the unique ...

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This has some implications in the properties and chemical reactivity of sigma and pi bonds. Ethyne or acetylene, HC=CH, is the simplest alkyne example. The process for understanding the sp hybridization process for carbon is basically an extension of the other two types (sp 3 and sp 2). Thus, in acetylene (ethyne), there are two unhybridized orbitals, which, by convention are and (see figure below): Figure: Illustrating the sp orbitals. The triple bonded carbon atoms of acetylene aresp hybridized. The sigma bond is short and strong. E)An alkyne reacts as an electrophile,and is therefore electron poor. Type of â ¦ You should try to work out this scheme on your own and see if your predictions agree with those presented in the textbook. is related to Unsaturated Hydrocarbons Quiz. The Structure of Ethyne (Acetylene): sp Hybridization ** Hydrocarbons in which two carbon atoms share three pairs of electrons between them, and are thus bonded by a triple bond, are called alkynes. Correspondingly, ...

Complexes of dibenzo-18-crown-6 (DB18C6, host) with water, ammonia, methanol, and acetylene (guest), formed in supersonic jets, have been characterized by using various spectroscopic methods: laser induced fluorescence (LIF), UV-UV hole-buning (UV-UV HB), and IR-UV double resonance (IR-UV DR) spectroscopy. Firstly, we reinvestigated the conformations of bare DB18C6 (species m1 and m2) and the structure of DB18C6-H2O (species a) [R. Kusaka, Y. Inokuchi, T. Ebata, Phys. Chem. Chem. Phys., 2008, 10, 6238] by measuring the IR-UV DR spectra in the region of the methylene CH stretching vibrations. From the IR-UV DR spectra, it was found that the IR spectral feature of the methylene CH stretch of DB18C6-H2O is clearly different from those of bare DB18C6 conformers, suggesting that DB18C6 changes its conformation when it forms the complex with a water molecule. With the aid of Monte Carlo simulation for extensive conformational search and density functional calculations (at B3LYP and M05-2X/6-31+G* ...

The Au(III) complex Au(tpy)(OAcF)2 (OAcF = OCOCF3; tpy = 2-(p-tolyl)pyridine) catalyzes the anti addition of trifluoroacetic acid (HOAcF) to acetylene to furnish vinyl trifluoroacetate. The Au(III) vinyl complex Au(tpy)(OAcF)(CH═CHOAcF) (vinyl group bonded trans to tpy-N) is formed during the early stage of the reaction. The vinyl complex, which has been isolated and structurally characterized, resists protolytic cleavage of the vinyl group, and therefore catalysis does not proceed by a simple formal insertion (i.e., coordination-nucleophilic attack-protolysis at the site trans to tpy-N) mechanism. Experimental evidence, including isotopic labeling, rather suggests that a double-insertion process is operative. The unobserved Au(III) divinyl complex Au(tpy)(CH═CHOAcF)2 is a crucial intermediate for which the true catalytic activity, comprising a coordination-nucleophilic attack-protolysis sequence, occurs at the site trans to tpy-C. The overall mechanism is in full agreement with DFT ...

This paper presents the adsorption properties of the o-Al13Co4(100) surface toward molecules involved in the semihydrogenation of acetylene. The energetically favored adsorption sites of H, C2H2, C2H3, and C2H4 are determined thanks to ab initio density functional calculations. The surface model used for this study has been determined previously [Phys. Rev. B 2011, 84, 085411], using an approach combining both experimental observations and density functional theory calculations. We show that although the surface termination layer of o-Al13Co4(100) is a dense Al-rich layer, its adsorption properties are quite different from pure elemental Al surfaces, especially for atomic hydrogen adsorption (exothermic on o-Al13Co4(100) and endothermic on low index Al surfaces). The role of surface and subsurface cobalt atoms is investigated carefully. The electronic donor/acceptor character of subsurface cobalt atoms is shown to influence the adsorption properties. In particular, the subsurface cobalt atoms have a

Synthesis routes of novel piperidine-containing acetylenes are presented. The new molecules are expected to exhibit plant growth stimulation properties. In particular, the yield in a situation of drought is expected to increase. Our synthesis makes use of the Favorskii reaction between cyclohexanone/piperidone and triple-bond containing alcohols. The structures of the obtained molecules were determined using nuclear magnetic resonance (NMR). The electronic structure and geometries of the molecules were studied theoretically using first-principles calculations based on density functional theory. The calculated geometries agree very well with the experimentally determined ones, and also allow us to determine bond lengths, angles and charge distributions inside the molecules.. ...

The catalytic hydrogenation of acetylene by liquid-supported nickel catalyst with special reference to the selective formation of ethylene ...

TY - JOUR. T1 - New Reaction of Iodine with Sterically Hindered Acetylene, 1,2,4,5-Tetramethyl-3,6-bis(phenylethynyl)benzene in Dimethyl Sulfoxide. AU - Yusubov, M. S.. AU - Zholobova, G. A.. AU - Vasileva, V. P.. AU - Habicher, W.. AU - Filimonov, V. D.. PY - 1996/8. Y1 - 1996/8. UR - http://www.scopus.com/inward/record.url?scp=0030337418&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0030337418&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:0030337418. VL - 32. SP - 1233. EP - 1234. JO - Russian Journal of Organic Chemistry. JF - Russian Journal of Organic Chemistry. SN - 1070-4280. IS - 8. ER - ...

Two new papers based on data from NASAs Cassini spacecraft scrutinize the complex chemical activity on the surface of Saturns moon Titan.

This regiospecific procedure consisted of a Pd domino indolization involving a consecutive Pd-catalyzed Sonogashira coupling followed by aminopalladation and reductive elimination starting from 2-iodo-N-trifluoroacetylanilide 1, a suitable acetylene 2 and bromoarene 3. The Senanayake group optimized the reaction conditions as shown in Scheme 1: the use of trifluoroacetyl as protecting group in 1 was shown to be advantageous (readily hydrolyzable); addition of bromobenzene at the beginning simplified the procedure and enhanced the reaction rate; DMF as solvent combined with K2CO3 as base, and a temperature of 60 C gave better results.. The Larock group of the Iowa State University reported (J. Org. Chem. 2006, 71, 62. ) on the synthesis of 3-iodoindoles 8 via Pd/Cu-catalyzed coupling of N,N-dialkyl-2-iodoanilines 5 with terminal acetylenes 6 and subsequent electrophilic cyclization of 7 (Scheme 2). Due to the high reactivity of N,N-dialkyl-o-iodoanilines towards the Sonogashira coupling, a wide ...

The NO turnover in soils was measured in two different experimental set-ups, a flow-through system, which is very time-consuming and needs rather sophisticated equipment, and a closed system using serum bottles. We compared the NO turnover parameters (NO consumption rate constant, NO production rate, NO compensation concentration) that were measured with both systems in different soils, under different conditions and in the presence of 10 Pa acetylene to inhibit nitrification. The values of the NO turnover parameters that were measured with the two systems under oxic conditions were usually comparable. The addition of acetylene did not affect the NO consumption rate constants of the soils with the exception of soil G1. However, the NO production rates and the NO compensation concentrations decreased significantly in the presence of acetylene, indicating that nitrification was the main source of NO in these soils. Only one soil (Bol) showed no nitrifying activity. Increasing soil moisture content ...

Nitroaromatic hydroxy substituted acetylene compounds wherein both the nitro and acetylene groups are directly connected to aromatic ring carbon atoms are hydrogenated in an inert solvent to selectively reduce the nitro function over a ruthenium disulfide catalyst. Of particular interest is the preparation of aminophenylacetylene from nitrophenyl hydroxy substituted acetylene.

TY - JOUR. T1 - A molecular porous zirconium-organic material exhibiting highly selective CO2 adsorption, high thermal stability, reversible hydration, facile ligand exchange and exclusive dimerization of phenylacetylene. AU - Lee, Nam Hee. AU - Lee, Dong Woo. AU - Yeo, Hakmin. AU - Kwak, Kyungwon. AU - Chun, Hyang Sook. AU - Ok, Kang Min. PY - 2014/7/7. Y1 - 2014/7/7. N2 - A new molecular porous zirconium-organic material, Zr{[NC5H 3(CO2)2]2(OH2) 2}·1.3H2O (CAUMOF-12) has been synthesized by a hydrothermal reaction using Zr(NO3)4, 2,6-NC 5H3(CO2H)2, HNO3 and water at 180 °C. Single-crystal X-ray diffraction was used to determine the crystal structure of the reported material. Although the material can be classified as a molecular compound, CAUMOF-12 exhibits a pseudo-three- dimensional open-framework structure with void spaces obtained by intermolecular hydrogen bonds. CAUMOF-12 reveals differential gas adsorption characteristics and high thermal stability. Reversible hydration, facile ligand ...

Dr. Julián Bergueiro Álvarez received his BS in Chemistry from the University of Santiago de Compostela (Spain) in 2007. In 2008 he obtained the MS in Organic Chemistry and in 2013 he received his PhD from USC for his work in sterecontrolled synthesis of retinoids employing transition metal catalyzed reactions in the key steps. During the last year of his PhD he joined the group of Prof. R. Riguera and Prof. E. Quiñoá to work on the synthesis and characterization of stimuliresponse helical polymers and poly(phenylacetylene)s@gold nanoparticles nanocomposites. In October 2013, he joined Prof. M. Calderón group to carry out his postdoctoral research at Freie Universität Berlin. His current research is focused on gold based thermoresponsive nanogels as novel drug delivery nanocarriers.. Publication at the Calderon Lab. Thermoresponsive Nanodevices in Biomedical Applications. J. Bergueiro, M. Calderón. Macromolecular Bioscience. Macromolecular Bioscience (2015), 15, ...

The change of substituent in the backbone Of L-proline-derived sulfamide-amine alcohol ligand 3 provides chiral propargylic alcohols with the opposite configurations in significant enantioselectivities in the asymmetric addition of phenylacetylene to aldehydes. Meanwhile, the ligand 3 in combination with Ti((OPr)-Pr-i)(4) could also afford the products with opposite absolute configuration in high yields. (c) 2006 Elsevier B.V. All rights reserved ...

PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

The Pd- or Pd/Cu-catalyzed coupling reactions of halobenzenes bearing the methyl, hydroxymethyl, acetoxymethyl, methoxycarbonyl, or both methoxy and 4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl groups in the ortho-position with gaseous or metallated acetylene, (trialkylsilyl)acetylenes, and arylacetylenes have been systematically studied. Various functionalized aryl- or diarylacetylenes have been synthesized in good to excellent yields. Whereas additional fluoro, nitro, or methoxy group attached to the benzene ring does not interfere in the coupling reactions, the presence of a methoxycarbonyl requires a careful optimization of reaction conditions to achieve moderate yields. Keywords: Halobenzenes; Phenylacetylenes; Diphenylacetylenes; Cross-coupling reactions; Palladium catalysis; Arenes; Alkynes. ...

Autori: Placidus B. Amama, Sangyun Lim, Dragos Ciuparu, Yanhui Yang, Lisa Pfefferle, Gary L. Haller. Editorial: Journal of Physical Chemistry B, 109(7), p.2645 -2656, 2005.. Rezumat:. Fe-substituted MCM-41 molecular sieves with ca. 1, 2, and 3 wt % Fe were synthesized hydrothermally using different sources of colloidal silica (HiSil and Cab-O-Sil) and characterized by ICP, XRD, N2 physisorption, UV-vis, EPR, TPR, and X-ray absorption. Catalysts synthesized from Cab-O-Sil showed higher structural order and stability than those from HiSil. The local environment of Fe in the mesoporous material as studied by UV-vis reveals the dominance of framework Fe in all the as-synthesized Fe-MCM-41 samples. Dislodgement of some Fe species to extraframework location occurs upon calcination, and this effect is more severe for Fe-MCM-41 (2 wt %) and Fe-MCM-41 (3 wt %), as confirmed by EPR and X-ray absorption. These materials have been used as catalytic templates for the production of carbon nanotubes (CNTs) by ...

A detailed chemical kinetic model is developed and tested for the combustion of C2 and C3 oxygenated fuels such as ethanol, DME (dimethyl ether), acetone and n-propanol. It is validated by comparing predictions with experimental data on the structure of low pressure burner stabilised premixed flames and laminar burning velocities over a wide range of equivalence ratios. Data from shock tube and stirred reactor studies has also been considered. The elementary reactions of ethanol and DME oxidation have been studied extensively and were used as a starting point for extension to C3 oxygenated fuels. The chemistry of acetylene which is one of major intermediate species in higher hydrocarbon flames was also updated to improve the reliability of the present mechanism and acetylene laminar burning velocities and low-pressure premixed lean and rich flames were also computed. The detailed mechanism features more than 1500 reaction steps and 269 species. The structure of laminar premixed flames are ...

We report on the use of a frequency-modulated continuous-wave technique for multiplexing optical fiber gas sensors. The sensor network is of a ladder topology and is interrogated by a tunable laser. The system performance in terms of detection sensitivity and cross talk between sensors was investigated and found to be limited by coherent mixing between signals from different channels. The system performance can be improved significantly by use of appropriate wavelength modulation-scanning coupled with low-pass filtering. Computer simulation shows that an array of 37 acetylene sensors with a detection accuracy of 2000 parts in 10(6) for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 10(6) for 2.5-cm gas cells (or a minimum detectable absorbance of 2.1 x 10(-4)) and a cross talk of -25 dB.

Textbook solution for Chemistry: An Atoms First Approach 2nd Edition Steven S. Zumdahl Chapter 4 Problem 79E. We have step-by-step solutions for your textbooks written by Bartleby experts!

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Alkynes (Acetylenes) Alkynes are unsaturated open-chain hydrocarbons which contain at least one triple bond in the carbon chain, they form a homologous series, Its general molecular formula is (CnH2n-2), where n the number of ...

Synonyms for alkyne in Free Thesaurus. Antonyms for alkyne. 2 synonyms for alkyne: acetylene, ethyne. What are synonyms for alkyne?

The isotopic effect on the electrochemical CO2 reduction reaction (CO2RR) is investigated in this study. A higher CO2RR selectivity over its competing hydrogen evolution reaction was observed in D2O-based electrolytes compared with the H2O-based counterparts, which can be attributed to the lower [D+] concent

Successful modeling of combustion and emissions in gas turbine engine combustors requires an adequate description of the reaction mechanism. For hydrocarbon oxidation, detailed mechanisms are only available for the simplest types of hydrocarbons such as methane, ethane, acetylene, and propane. These detailed mechanisms contain a large number of chemical species participating simultaneously in many elementary kinetic steps. Current computational fluid dynamic (CFD) models must include fuel vaporization, fuel-air mixing, chemical reactions, and complicated boundary geometries. To simulate these conditions a very sophisticated computer model is required, which requires large computer memory capacity and long run times. Therefore, gas turbine combustion modeling has frequently been simplified by using global reaction mechanisms, which can predict only the quantities of interest: heat release rates, flame temperature, and emissions. Jet fuels are wide-boiling-range hydrocarbons with ranges extending through

JENGAS deliver Acetylene, Oxygen, Nitrogen, CO2 and Argon gas cylinders for home the handyman or business. JENGAS sell gas cylinders outright so there is no deposit or rental

Nanoporous polymers as nanoparticle caging hosts for gas conversions. We showed that common transition metal nanoparticle based composites of porous polymers can catalyze probe reactions such as CO oxidation as good as platinum (J. Mater. Chem. A 2015, 3, 15489). Acetylene can be selectively reduced to ethylene using metal doped-COP-6 networks (ACS Catal. 2016, 6, 2435-2442 ...

I would like to see what people are using to do there line sets. I think it would be fun to see the see how different we are to do the same job. I use the cheep green pads to clean the copper. They leave no residue. Stay-sil 15% brazing rods. Oxygen acetylene torch #3 tip | 5/8 #7 tip | 5/8 Purge line with Argon (not nitrogen) Thermal Engineering analog Vacuum Gauge. Robinair 5 cfm Vacuum Pump.

Infrared and Raman spectra of mono {sup 13}C fully deuterated acetylene, {sup 13}C{sup 12}CD{sub 2}, have been recorded and analysed to obtain detailed information on the C-D stretching fundamentals and associated combination, overtone, and hot bands. Infrared spectra were recorded at an instrumental resolution ranging between 0.006 and 0.01 cm{sup −1} in the region 1800-7800 cm{sup −1}. Sixty new bands involving the ν{sub 1} and ν{sub 3} C-D stretching modes also associated with the ν{sub 4} and ν{sub 5} bending vibrations have been observed and analysed. In total, 5881 transitions have been assigned in the investigated spectral region. In addition, the Q branch of the ν{sub 1} fundamental was recorded using inverse Raman spectroscopy, with an instrumental resolution of about 0.003 cm{sup −1}. The transitions relative to each stretching mode, i.e., the fundamental band, its first overtone, and associated hot and combination bands involving bending states with υ{sub 4} + υ{sub 5} up ...

Method for separating aromatic compounds using simulated moving bed operation | High energy reduction in a propane dehydrogenation unit by utilizing a high pressure product splitter column | Process for producing olefins | Feed pretreating | Process for simultaneous production of benzene and ethylene by conversion of acetylene |

The term macromolecule was coined by Nobel laureate Hermann Staudinger in the 1920s, although his first relevant publication on this field only mentions high molecular compounds (in excess of 1,000 atoms). [1]. At that time the phrase polymer as introduced by Berzelius in 1833 had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little to do with size.[2]. Usage of the term to describe large molecules varies among the disciplines. For example, while biology refers to macromolecules as the four large molecules comprising living things, in chemistry, the term may refer to aggregates of two or more macromolecules held together by intermolecular forces rather than covalent bonds but which do not readily dissociate.[3]. According to the standard IUPAC definition, the term macromolecule as used in polymer science refers only to a single molecule. For example,a single polymeric molecule is appropriately described as a ...

Other articles where Agamassan is discussed: Nils Dalén: …in 1909 and then invented Agamassan, a substance that absorbs acetylene, making it possible to concentrate the gas with no danger of explosion. He was blinded by an explosion during an experiment in 1913, but he continued experimental work until his death.

Abele E.; Rubina K.; Lukevics E. Novel fluoride ion-mediated method of O-silylation and germylation of aromatic and heterocyclic oximes with terminal silylated and germylated acetylenes under phase transfer catalysis conditions . Latvian J. Chem. 2000(1), 77-81 ...

Students will learn basic skills related to welding and agricultural mechanics. Students will develop skills in the areas of working hot and cold metal including welding processes such as oxy/acetylene, shielded metal arc welding, gas metal arc welding (MIG), and project construction. Students will also learn to maintain, repair, and operate small gas engines. Additional basic skills may be taught including: plumbing, painting, measurements and tool identification. Emphasis will be placed on safety and proper use of tools and equipment. This class is part of an integral agriculture program ...

9 Best Kitchen Chimney in India 2021 (For Your Sparkling .... CG-30 STRAIGHT LINE CUTTING MACHINE Performs high quality straight, and bevel cuts. Includes 1 torch. 3 tips Airco/Concoa Style for Acetylene, Nº 1, 2 and 3. 70 inches rail. Stepless Drive System Maintains constant travel speed even at high temperatures for stable cuts. Lightweight, easy to carry and use. High-Quality Tips for fast and smooth .... View More ,,. ...

When using the MÄKTIG retractable twin welding hose reel, your welding hoses are stretched to only the necessary length, leaving the rest nice and tidy inside the reel and away from other tools and equipment. Compared to its rivals, this hose reel is definitely on the high end of the quality engineering spectrum. It is constructed of industrial-grade steel and equipped with 50 feet of ¼-inch diameter oxygen and acetylene hoses capable of bearing 200 psi of pressure. The directional rollers make deployment in any direction a breeze. These hoses feature dual O-ring seals and a whip hose with hose stop. The reel tension is also adjustable so you can use as much or as little effort to deploy it as you like ...

Plastic Model Kit. Rare. Dated 1970. Wild kit featuring detailed, all chrome Corvair engine and rear suspension, Goodyear slicks in rear with narrow tires up front, dropped front axle, chrome mag wheels, steerable front wheels, acetylene headlights and carriage lamp taillight, wrap-around flower box, one-piece fender with upholstered running board, hourglass taxi meter, bulb honk horn, custom bucket seats, luggage rack with guitar, suitcase and attache case and clear plastic windows with etched design. Molded in light blue, chrome plate, clear and with black tires. The kit has never been started. It has been inventoried complete with all parts and includes near mint condition decals and instructions.

This list of 10 letter words containing n has 5743 entries. It may be helpful for people looking for words that contain N, and 10 letter words with n. abandoning, abasements, abatements, abdicating, abdication, abducentes, aberration, abeyancies, abhorrence, abjectness, abjuration, abnegating, abnegation, abnormally, abolishing, abolitions, abominable, abominated, abominates, aboriginal, aborigines, abreacting, abridgment, abrogating, abscessing, absconding, absolution, absorbency, absorption, abstainers, abstaining. abstention, absterging, abstinence, abundances, abundantly, acanthuses, accentuate, acceptance, accessions, accidental, acclaiming, accordance, accordions, accountant, accounting, accoutring, accusation, acerbating, acetifying, acetylenes, achinesses, acidifying, acidnesses, acierating, acquainted, acquitting, acrimonies, activating, activation, adamancies, adaptation, addictions, additional, addressing, adenitises, adenopathy. adherences, adhibiting, adjourning, adjustment, ...

[145 Pages Report] Acetaldehyde Market Analysis categorizes the global market By Manufacturing Process (Acetylene Hydration, Others) Application (F&B, Pulp & Paper bleaching, Others) & geography

I couldnt wait till my husband came home from work to set things up properly, so I used my acetylene/atmospheric torch. The colors are a little muddy and a bit of a challenge with only one hand, but not to bad. I may have to break down and use some color in my work ...

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Nitrogenases are vitally important enzymes that perform an amazing chemical reaction, the reduction of N2 to ammonia. In nitrogenases, iron-sulfur clusters cata...

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