Early developments in Lewis acid reagents focused on easily available compounds such as TiCl4, BF3, SnCl4, and AlCl3. (wikipedia.org)
Dipeptides are organic compounds containing a sequence of exactly two alpha-amino acids joined by a peptide bond. (hmdb.ca)
See also boiling points of hydrcarbons, alcohols and acids , densities for different kinds of organic compounds and density, boiling and melting points of nitrogen and sulfur compounds. (engineeringtoolbox.com)
This compound belongs to the class of organic compounds known as thia fatty acids. (drugbank.com)
These are compounds containing a saccharide unit which bears a carboxylic acid group. (drugbank.com)
Few organofluorine compounds exist naturally ( C&EN, May 22, page 12 ), meaning that almost all must be made. (acs.org)
Acid refers to the cations ionized in aqueous solution are all compounds of hydrogen ions, which can be divided into inorganic acids and organic acids. (guidechem.com)
Decanoic acid belongs to the class of organic compounds known as medium-chain fatty acids. (guidechem.com)
Palmitic acid, also known as palmitate or C16, belongs to the class of organic compounds known as long-chain fatty acids. (foodb.ca)
These derivatives can be prepared by reacting di- or triethanolamine with an alkali metal or alkaline earth metal salt of maleic acid in the presence of a catalyst such as lanthanoid compounds, a nickel compound or alkaline earth metal compounds, e.g. calcium hydroxide or magnesium hydroxide. (justia.com)
Derivatives8
Acrylates are derivatives of acrylic acid (the structural formula CH 2 =CHCO 2 H), including its salts and esters. (wellnessadvantage.com)
We report a method to prepare α-chiral carboxylic acid derivatives, including those bearing all-carbon quaternary centers, through an enantioselective CuH-catalyzed hydrocarboxylation of allenes with a commercially available fluoroformate. (mit.edu)
A broad range of heterocycles and functional groups on the allenes were tolerated in this protocol, giving enantioenriched α-quaternary and tertiary carboxylic acid derivatives in good yields with exclusive branched regioselectivity. (mit.edu)
These are fatty acid derivatives obtained by insertion of a sulfur atom at specific positions in the chain. (drugbank.com)
The present invention relates to a granular catalyst for the hydrolysis of amino nitriles and/or amino amides to amino acids or derivatives thereof, a process for the preparation of this catalyst and a method for the preparation of an am. (sumobrain.com)
A convenient electrophile-electrophile cross-coupling of carboxylic acid derivatives and alkylpyridinium salts via C-N bond cleavage provides various functionalized ketones in very good yields. (organic-chemistry.org)
The present invention relates to a process for in situ the preparation of mixtures of chelating agents by catalyzed reactions of diethanolamine derivatives with maleic acid and then with 2-halocarboxylic acid, to mixtures of chelating agents and methods using such chelating agents. (justia.com)
WO 97/45396 discloses N-bis- and N-tris-[(1,2-dicarboxy-ethoxy)-ethyl]-amine derivatives including N-bis-[(1,2-dicarboxy-ethoxy)-ethyl]-aspartic acid (also called aspartic acid diethoxy succinate or AES), and the use of these derivatives as chelating agents of metals, especially in connection with pulp bleaching. (justia.com)
Aliphatic1
These are fatty acids with an aliphatic tail that contains between 13 and 21 carbon atoms. (foodb.ca)
Esters1
Application of the Miyaura-Hayashi rhodium-catalysed addition of aryl boronic acids to acyclic unsaturated esters featuring basic centres to yield γ-amino butyric acids incorporating a substituted β-phenyl group is described. (strath.ac.uk)
New analogs of the commercial asymmetric monomethine cyanine dyes thiazole orange (TO) and thiazole orange homodimer (TOTO) with hydroxypropyl functionality were synthesized and their properties in the presence of different nucleic acids were studied. (mdpi.com)
The symposium has been inspired by the thematic issue " Nucleic Acid Chemistry " in the Open Access Beilstein Journal of Organic Chemistry, edited by Hans-Achim Wagenknecht. (beilstein-institut.de)
The Beilstein Organic Chemistry Symposium 2016 was inspired by the Thematic Series "Nucleic acid chemistry" in the Beilstein Journal of Organic Chemistry. (beilstein-institut.de)
Since the discovery of solid-phase DNA (and later RNA) synthesis by methods of organic chemistry, the field of nucleic acid chemistry exploded. (beilstein-institut.de)
Although nucleic acid chemistry seems to be already a mature part of organic and bioorganic chemistry, actual questions that are raised by research in biology and chemical biology give enough reasons to synthesize new nucleic acid probes and thereby further develop nucleic acid chemistry. (beilstein-institut.de)
These broad aspects of nucleic acid chemistry were covered by the topics of five different sessions that included 21 invited speakers. (beilstein-institut.de)
In the first session "new nucleic acid building blocks", Annemieke Madder reported on modified nucleic acids for crosslinks and Elmar Weinhold talked about sequence-specific labeling of DNA by methyltransferases. (beilstein-institut.de)
Sabine Müller described trinucleotide phosphoramidites and Michal Hocek allowed an insight into polymerase-assisted synthesis of modified nucleic acids. (beilstein-institut.de)
Hiroyuki Asanuma followed this path by a report on threolinol and serinol nucleic acid analogs and Jesper Wengel extended the topic by peptide-nucleic acid conjugates. (beilstein-institut.de)
The open end timeline in the evening after dinner allowed intense discussions about all aspects of nucleic acids by PhD researchers, postdocs and junior professors together with the invited speakers. (beilstein-institut.de)
The single session on Thursday was focused on light-driven and fluorescent functionalities and started with Nathan Luedtke talking about biorthogonal fluorescent reporters for nucleic acids in cells and Oliver Seitz focusing on enhanced hybridization probes for RNA imaging. (beilstein-institut.de)
The program on Friday started with the session "new nucleic acid architectures and base pairs" and comprised a presentation by Jens Müller on metal-mediated base pairing and a lecture by Clemens Richert on prebiotic aspects of peptido RNA formation. (beilstein-institut.de)
Andrea Rentmeister gave a chemical biology perspective on the 5'-cap and Snorri Sigurdsson described strategies for site-directed spin labeling of nucleic acids. (beilstein-institut.de)
Before this stage, the pre-RNA world may have been based on molecules called xeno nucleic acids (XNAs). (astrobiology.com)
They synthesized fragments of acyclic (non-circular) L-threoninol nucleic acid (L-aTNA), a molecule that is thought to have existed before RNA came to be. (astrobiology.com)
The paper, "Nonenzymatic polymerase-like template-directed synthesis of acyclic L-threoninol nucleic acid," was published online in the journal Nature Communications on February 5, 2021 at DOI: 10.1038s41467-021-21128-0. (astrobiology.com)
Formic acid1
The subject product, 4-Chlorophenyl chloroformate, is a halogenated aromatic ester of a formic acid derivative (halogenated) indicated for use as a pharmaceutical intermediate. (faqs.org)
Fatty3
Palmitic acid, or hexadecanoic acid, is one of the most common saturated fatty acids found in animals, plants, and microorganisms. (hmdb.ca)
Palmitic acid is the first fatty acid produced during fatty acid synthesis and is the precursor to longer fatty acids. (hmdb.ca)
Alcohol and fatty acid stimulation of neurotensin release from rat small intestine. (umassmed.edu)
Amino acid7
Some dipeptides are known to have physiological or cell-signalling effects although most are simply short-lived intermediates on their way to specific amino acid degradation pathways following further proteolysis. (hmdb.ca)
The production method according to the present invention is characterized in that a D-amino acid oxidase used in step 2 in the scheme shown below is a polypeptide selected from the below-mentioned polypeptides (a) to (c). (sumobrain.com)
Click chemistry is compatible with various protected amino acid side chains used in peptide synthesis. (genengnews.com)
As a result, we demonstrate that Δp K a is an experimental parameter to estimate increments in the carbonyl-carbonyl alignment, as determined by the amino acid or peptidyl context. (rsc.org)
Electrostatic interactions between the tetraanionic 1 and 2 with the amino acid guests (in their N-acetylated, zwitterionic, or CO-NH2 forms) was demonstrated to dramatically influence the strength of the recognition process. (umd.edu)
According to the present invention it was surprisingly found that the free hydroxyl groups of bis-(2-hydroxyethyl)glycine or bis-(2-hydroxyethyl)methyl glycine, or salts thereof can easily and effectively be converted into other reactive ingredients by the addition of a maleate into the reaction containing a lanthanoid catalyst to yield an amino acid derivative substituted with succinic acid groups. (justia.com)
Salts thereof1
It has now been surprisingly found that mixtures of chelating agents having a diethanol amine backbone can be effectively prepared by lanthanoid-catalysed reaction of bis-(2-hydroxyethyl)glycine or bis-(2-hydroxyethyl)methyl glycine, or salts thereof with a maleate followed by a subsequent lanthanide-catalyzed reaction with a 2-halocarboxylic acid. (justia.com)
Atoms1
According to the number of hydrogen ions produced by acid molecule ionization, it can be divided into monobasic acid, dicarboxylic acid and ternary acid, and according to the presence or absence of oxygen atoms in acid molecule, it can be divided into oxygenated acid and anoxic acid. (guidechem.com)
Peptides3
Peptides can also be made by inter- and intramolecular click reactions using azide or alkyne containing amino acids or building blocks during peptide synthesis. (genengnews.com)
Chapter 1 introduces cucurbit[n]urils and their molecular recognition properties toward amino acids, peptides, and Insulin. (umd.edu)
Chapter 2 describes the application of the acyclic CB[n], Calabadion 1 and 2 for the molecular recognition of amino acids, peptides, and Insulin. (umd.edu)
Synthesis1
Fmoc- protected for solid phase synthesis), propargyl amino acids, PEG azide and alkynes (Maleimide-PEG3-Azide and acetylene PEG maleimide for pegylation), alkyne and azide containing chemical modification reagents (propargyl amine, 1-(2-nitrophenyl) propargyl alcohol, succinidyl-hex-5-ynoate, succinimidyl-4-azovalerate, pentynoic acid, 2-azido-3-methyl propanoic acid) and Diazo transfer reagents (imidazole-1-sulfonyl azide). (genengnews.com)
Carbonyl3
In reactions with polar mechanisms, Lewis acid catalysis often involves binding of the catalyst to Lewis basic heteroatoms and withdrawing electron density, which in turn facilitates heterolytic bond cleavage (in the case of Friedel-Crafts reaction) or directly activates the substrate toward nucleophilic attack (in the case of carbonyl addition reactions). (wikipedia.org)
Among the types of reactions that can be catalyzed by Lewis acids, those with carbonyl-containing substrates have received the greatest amount of attention. (wikipedia.org)
The use of an arylvinyl α-carbonyl acid ester compound (I) as a photoinitiator in LED photopolymerization and a preparation method therefor, which relate to the field of polymer photocuring, and are provided on the basis of the problems. (sumobrain.com)
Hydrochloric1
The common acids are sulfuric acid, hydrochloric acid, nitric acid and so on. (guidechem.com)
Acceptor3
In Lewis acid catalysis of organic reactions, a metal-based Lewis acid acts as an electron pair acceptor to increase the reactivity of a substrate. (wikipedia.org)
The Lewis acid bind via a donor-acceptor interaction to the dienophile and via that mechanism polarizes occupied orbital density away from the reactive C=C double bond of the dienophile towards the Lewis acid. (wikipedia.org)
Alternatively, asymmetric autocatalysis will be explored using simple cyclic and acyclic acceptor molecules and amine donors to generate e.g. amino acids. (noorderlink.nl)
Butyric4
Butyric Acid" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (umassmed.edu)
This graph shows the total number of publications written about "Butyric Acid" by people in this website by year, and whether "Butyric Acid" was a major or minor topic of these publications. (umassmed.edu)
Below are the most recent publications written about "Butyric Acid" by people in Profiles. (umassmed.edu)
At low dilutions, it has a pleasant, fruity taste clear colorless to pale yellowish liquidChEBI: A methylbutyric acid comprising a butyric acid core carrying a 2-methyl substituent. (guidechem.com)
It is an acid compound found in citrus fruits. (sdsc.edu)
Citric acid is a weak organic tricarboxylic acid found in citrus fruits. (guidechem.com)
Hydrogen2
Acids can react with bases or alkaline oxides to form salt and water, or with certain metals to form salt and hydrogen, and the indicator can be discolored when the aqueous solution contains acids. (guidechem.com)
In pulp bleaching liquors, iron and manganese ions are desired to be trapped by a chelating agent, thereby inhibiting these metal ions from catalyzing the decomposition of the bleaching agents, hydrogen peroxide or peroxy acids. (justia.com)
Carbon3
Many classical reactions involving carbon-carbon or carbon-heteroatom bond formation can be catalyzed by Lewis acids. (wikipedia.org)
A four carbon acid, CH3CH2CH2COOH, with an unpleasant odor that occurs in butter and animal fat as the glycerol ester. (umassmed.edu)
The tables and figures below show how the melting point changes with increasing carbon number up to C 33 for different kinds of hydrocarbons, alcohols and carboxylic acids. (engineeringtoolbox.com)
Ester1
The present invention relates to a method for preparing an ester thiol compound by reacting a polyalcohol and a mercaptocarboxylic acid and to an optical resin or optical lens obtained therefrom having superior optical properties. (sumobrain.com)
Citric3
The salts of citric acid (citrates) can be used as anticoagulants due to their calcium-chelating ability. (sdsc.edu)
Citric acid is one of the active ingredients in Phexxi, a non-hormonal contraceptive agent that was approved by the FDA on May 2020. (sdsc.edu)
Citric acid is a natural preservative and food tartness enhancer. (guidechem.com)
Succinic1
Succinic acid is an intermediate product of the tricarboxylic acid cycle, as well as one of fermentation products of anaerobic metabolism. (guidechem.com)
Amide1
The acidity of N -acyl amino acids is dependent upon the rotameric state of the amide bond. (rsc.org)
Asymmetric2
More recently, Lewis acid catalysts with chiral ligands have become an important class of tools for asymmetric catalysis. (wikipedia.org)
In addition, the Lewis acid catalyst also increases the asynchronicity of the Diels-Alder reaction, making the occupied π-orbital located on the C=C double bond of the dienophile asymmetric. (wikipedia.org)
Biological2
Our strategy is an attractive system for experimenting with the construction of artificial life and the development of highly functional biological tools composed of acyclic XNA," says Murayama. (astrobiology.com)
This parameter is also important in understanding the roles of amino acids in both protein folding and translation in biological systems as well as their evolutionary appearance in the genetic code. (rsc.org)
Experimental1
We observed conservative Δp K a s for acyclic amino acids (2.2-3.0 kJ mol −1 ), whereas in the case of alicyclic amino acids, the experimental values revealed a strong dependency on the structural context (1.5-4.4 kJ mol −1 ). (rsc.org)
Aromatic1
Chapter 3 introduces a new acyclic CB[n] featuring a central glycoluril trimer with sulfonated triptycene aromatic sidewalls. (umd.edu)
Chemistry1
I want to get the latest chemistry news from C&EN in my inbox every week. (acs.org)
Groups1
Challenges in the development of Lewis acid catalysis include inefficient catalyst turnover (caused by catalyst affinity for the product) and the frequent requirement of two-point binding for stereoselectivity, which often necessitates the use of auxiliary groups. (wikipedia.org)