amino-acid residue (in a polypeptide)
... When two or more amino acids combine to form a peptide, the elements of water are removed, and what remains of each amino acid is called an amino-acid residue. α-Amino-acid residues are therefore structures that lack a hydrogen atom of the amino group (–NH–CHR–COOH), or the hydroxyl moiety of the ca ...
... When two or more amino acids combine to form a peptide, the elements of water are removed, and what remains of each amino acid is called an amino-acid residue. α-Amino-acid residues are therefore structures that lack a hydrogen atom of the amino group (–NH–CHR–COOH), or the hydroxyl moiety of the ca ...
States United Patent at
... 3-(dirnethylamino)acrylaldehyde ("3-DMA") and phosphoto the benzenoid ring formed in the cyclization reaction causes the formation of a product that is either dialkyl ryl chloride (POCl3 ) to form the corresponding meso-(2formylvinyl)porphyrins. These reactions are commonly substituted or hydroxyal. ...
... 3-(dirnethylamino)acrylaldehyde ("3-DMA") and phosphoto the benzenoid ring formed in the cyclization reaction causes the formation of a product that is either dialkyl ryl chloride (POCl3 ) to form the corresponding meso-(2formylvinyl)porphyrins. These reactions are commonly substituted or hydroxyal. ...
molecules Palladium and Organocatalysis: An Excellent Recipe for Asymmetric Synthesis
... methodology allows the preparation of functionalized optically active cyclopentenes with all-carbon quaternary stereocenters in good diastereo- and high enantioselectivities from simple starting materials such as α,β-unsaturated aldehydes (aromatic and aliphatic) and activated propargylated methylen ...
... methodology allows the preparation of functionalized optically active cyclopentenes with all-carbon quaternary stereocenters in good diastereo- and high enantioselectivities from simple starting materials such as α,β-unsaturated aldehydes (aromatic and aliphatic) and activated propargylated methylen ...
Carboxylic acids and derivatives
... • Usually solids with no odor. • Carboxylate salts of Na+, K+, Li+, and NH4+ are soluble in water. • Soap is the soluble sodium salt of a long chain fatty acid. • Salts can be formed by the reaction of an acid with NaHCO3, releasing CO2. ...
... • Usually solids with no odor. • Carboxylate salts of Na+, K+, Li+, and NH4+ are soluble in water. • Soap is the soluble sodium salt of a long chain fatty acid. • Salts can be formed by the reaction of an acid with NaHCO3, releasing CO2. ...
2010 - SAASTA
... Flour proteins called glutenins and gliadins, when added to water, begin to cross-link and polymerise by connection of two cysteine residues through a disulfide bond to form gluten. This cross-linking results in thickening of the batter. 2. The compound type formed by reacting a carboxylic acid with ...
... Flour proteins called glutenins and gliadins, when added to water, begin to cross-link and polymerise by connection of two cysteine residues through a disulfide bond to form gluten. This cross-linking results in thickening of the batter. 2. The compound type formed by reacting a carboxylic acid with ...
Get Notes - Mindset Learn
... adds bromine water to a sample of each in two different test tubes. She observes that the one compound decolourises the bromine water immediately, whilst the other one only reacts after placing the test tube in direct sunlight. Write down the: ...
... adds bromine water to a sample of each in two different test tubes. She observes that the one compound decolourises the bromine water immediately, whilst the other one only reacts after placing the test tube in direct sunlight. Write down the: ...
Organic Halides
... hemiacetal, and its acetal all exist in solution. Hemiacetal results from addition of the alcohol’s hydroxyl group to the carbon in the C=O bond. A cetals are products of substitution reactions catalyzed by acid. The presence of acid improves the leaving capacity of the hydroxyl group and enables it ...
... hemiacetal, and its acetal all exist in solution. Hemiacetal results from addition of the alcohol’s hydroxyl group to the carbon in the C=O bond. A cetals are products of substitution reactions catalyzed by acid. The presence of acid improves the leaving capacity of the hydroxyl group and enables it ...
2287 Summary
... ice water during the reaction and stirring was continued for one-half to three-quarters of an hour after the addition of the bromo compound. Cold, coned. hydrochloric acid was then added very slowly along with some finely cracked ice until the mixture was acidic. If it became warm the product turned ...
... ice water during the reaction and stirring was continued for one-half to three-quarters of an hour after the addition of the bromo compound. Cold, coned. hydrochloric acid was then added very slowly along with some finely cracked ice until the mixture was acidic. If it became warm the product turned ...
Properties of haloalkanes
... haloalkanes and hydroxide are put together, but by changing the conditions, we can make one reaction much more probable than the other. In aqueous conditions, the substitution reaction is most likely. ...
... haloalkanes and hydroxide are put together, but by changing the conditions, we can make one reaction much more probable than the other. In aqueous conditions, the substitution reaction is most likely. ...
Exam 3 Answer Key
... 6. (2.5) True or False? A molecule with a non-superimposable mirror image must be chiral. 7. (2.5) True or False? A hydrogen attached to a carbon of a triple bond can be abstracted using a base, the conjugate acid of which is stronger than the alkyne. ...
... 6. (2.5) True or False? A molecule with a non-superimposable mirror image must be chiral. 7. (2.5) True or False? A hydrogen attached to a carbon of a triple bond can be abstracted using a base, the conjugate acid of which is stronger than the alkyne. ...
CHM 331 : General Organic Chemistry
... Example problems: give the major organic products of the following reactions ...
... Example problems: give the major organic products of the following reactions ...
CHEM1102 2014-J-8 June 2014 • Complete the following table
... treatment of attention-deficit disorder. Identify all stereogenic (chiral) centres in methylphenidate by clearly marking each with an asterisk (*) on the structure below. ...
... treatment of attention-deficit disorder. Identify all stereogenic (chiral) centres in methylphenidate by clearly marking each with an asterisk (*) on the structure below. ...
Brominations and Alkene Synthesis CHM 233 Review
... Example problems: give the major organic products of the following reactions ...
... Example problems: give the major organic products of the following reactions ...
A-level Chemistry Question paper Unit 4 - Further Physical
... (iii) State and explain which of the two routes to propylamine, by nucleophilic substitution or by reduction, gives the less pure product. Draw the structure of a compound formed as an impurity. Route giving the less pure product ...................................................................... ...
... (iii) State and explain which of the two routes to propylamine, by nucleophilic substitution or by reduction, gives the less pure product. Draw the structure of a compound formed as an impurity. Route giving the less pure product ...................................................................... ...
Hard-Soft Acid - Base Theory
... acid, those that increase the concentration of the anion are bases. ...
... acid, those that increase the concentration of the anion are bases. ...
H + - uaschemistry
... • For physical evidence, include a comparison of carbon– carbon bond lengths in alkanes, alkenes and benzene, and the number of structural isomers with the formula C6H4X2. • For chemical evidence, include a comparison of the enthalpies of hydrogenation of benzene, cyclohexene, 1,3-cyclohexadiene and ...
... • For physical evidence, include a comparison of carbon– carbon bond lengths in alkanes, alkenes and benzene, and the number of structural isomers with the formula C6H4X2. • For chemical evidence, include a comparison of the enthalpies of hydrogenation of benzene, cyclohexene, 1,3-cyclohexadiene and ...
Chapter 15 Carboxylic Acids and Esters
... vegetable oils is an important process that takes place when the fats and oils are digested by the human body and other biological organisms. ...
... vegetable oils is an important process that takes place when the fats and oils are digested by the human body and other biological organisms. ...
Organic Chemistry III
... The simplest arene is benzene. It has the molecular formula C6H6 Its basic structure is six C atoms in a hexagonal ring, with one H atom bonded to each C atom Each C atom is bonded to two other C atoms and one H atom by single covalent σ-bonds. This leaves one unused electron on each C atom in a p o ...
... The simplest arene is benzene. It has the molecular formula C6H6 Its basic structure is six C atoms in a hexagonal ring, with one H atom bonded to each C atom Each C atom is bonded to two other C atoms and one H atom by single covalent σ-bonds. This leaves one unused electron on each C atom in a p o ...
CHEM 242 Organic Chemistry II-Bender
... Course Content: Organic Chemistry I will cover chapters10, 13 – 20, 22, and 23. Special emphasis will be placed on aromatic compounds, carbonyl compounds, carboxylic acids, amines, phenols, spectroscopy, structure and reactivity, biomolecules and multi-step synthesis. Laboratory is included and chap ...
... Course Content: Organic Chemistry I will cover chapters10, 13 – 20, 22, and 23. Special emphasis will be placed on aromatic compounds, carbonyl compounds, carboxylic acids, amines, phenols, spectroscopy, structure and reactivity, biomolecules and multi-step synthesis. Laboratory is included and chap ...
applied sciences Chiral β-Amino Alcohols as Ligands for the N
... prochiral ketones affords enantiomerically enriched secondary alcohols with excellent results [12–19]. Nevertheless, the asymmetric reduction of iminic compounds by transfer hydrogenation yielding chiral amines still remains underdeveloped and represents a challenging objective [20,21]. Due to the l ...
... prochiral ketones affords enantiomerically enriched secondary alcohols with excellent results [12–19]. Nevertheless, the asymmetric reduction of iminic compounds by transfer hydrogenation yielding chiral amines still remains underdeveloped and represents a challenging objective [20,21]. Due to the l ...
Petasis reaction
The Petasis reaction (alternatively called the Petasis borono–Mannich (PBM) reaction) is the chemical reaction of an amine, aldehyde, and vinyl- or aryl-boronic acid to form substituted amines.Reported in 1993 by Nicos Petasis as a practical method towards the synthesis of a geometrically pure antifungal agent, naftifine, the Petasis reaction can be described as a variation of the Mannich reaction. Rather than generating an enolate to form the substituted amine product, in the Petasis reaction, the vinyl group of the organoboronic acid serves as the nucleophile. In comparison to other methods of generating allyl amines, the Petasis reaction tolerates a multifunctional scaffold, with a variety of amines and organoboronic acids as potential starting materials. Additionally, the reaction does not require anhydrous or inert conditions. As a mild, selective synthesis, the Petasis reaction is useful in generating α-amino acids, and is utilized in combinatorial chemistry and drug discovery.