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6- methyl groups

Transferases. Enzymes which transfer a group, possibly a methyl group or a glycosyl group, from one compound to another. The name of the group transferred is usually in-... [Pg.159]

The solutions of all the methylamines in water are alkaline, but the alkalinity decreases with the number of methyl groups. [Pg.260]

Vitamin Bj 2 is concerned in the biosynthesis of methyl groups of choline and methionine. [Pg.423]

Molecules larger than those considered so far are fonned by linking together several smaller components. A new kind of dynamics typical of these systems is already seen in a molecule such as C2Hg, in which there is hindered rotation of the two methyl groups. Systems with hindered internal rotation have been studied in great... [Pg.78]

Snetivy D and Vancso G J 1994 Atomic force microscopy of polymer crystals 7. Chain packing, disorder and imaging of methyl groups in oriented isotactic polypropylene Po/yme/ 35 461... [Pg.1727]

Figure B2.4.1. Proton NMR spectra of the -dimethyl groups in 3-dimethylamino-7-methyl-l,2,4-benzotriazine, as a fiinction of temperature. Because of partial double-bond character, there is restricted rotation about the bond between the dunethylammo group and the ring. As the temperature is raised, the rate of rotation around the bond increases and the NMR signals of the two methyl groups broaden and coalesce. Figure B2.4.1. Proton NMR spectra of the -dimethyl groups in 3-dimethylamino-7-methyl-l,2,4-benzotriazine, as a fiinction of temperature. Because of partial double-bond character, there is restricted rotation about the bond between the dunethylammo group and the ring. As the temperature is raised, the rate of rotation around the bond increases and the NMR signals of the two methyl groups broaden and coalesce.
Figure B2.4.1 illustrates this type of behaviour. If there is no rotation about the bond joining the N, N -dimethyl group to the ring, the proton NMR signals of the two methyl groups will have different chemical shifts. If the rotation were very fast, then the two methyl enviromnents would be exchanged very quickly and only a single, average, methyl peak would appear in the proton NMR spectrum. Between these two extremes, spectra like those in figure B2.4.1 are observed. At low temperature, when the rate is slow, two... Figure B2.4.1 illustrates this type of behaviour. If there is no rotation about the bond joining the N, N -dimethyl group to the ring, the proton NMR signals of the two methyl groups will have different chemical shifts. If the rotation were very fast, then the two methyl enviromnents would be exchanged very quickly and only a single, average, methyl peak would appear in the proton NMR spectrum. Between these two extremes, spectra like those in figure B2.4.1 are observed. At low temperature, when the rate is slow, two...
Figure B2.4.8. Relaxation of two of tlie exchanging methyl groups in the TEMPO derivative in figure B2.4.7. The dotted lines show the relaxation of the two methyl signals after a non-selective inversion pulse (a typical experunent). The heavy solid line shows the recovery after the selective inversion of one of the methyl signals. The inverted signal (circles) recovers more quickly, under the combined influence of relaxation and exchange with the non-inverted peak. The signal that was not inverted (squares) shows a characteristic transient. The lines represent a non-linear least-squares fit to the data. Figure B2.4.8. Relaxation of two of tlie exchanging methyl groups in the TEMPO derivative in figure B2.4.7. The dotted lines show the relaxation of the two methyl signals after a non-selective inversion pulse (a typical experunent). The heavy solid line shows the recovery after the selective inversion of one of the methyl signals. The inverted signal (circles) recovers more quickly, under the combined influence of relaxation and exchange with the non-inverted peak. The signal that was not inverted (squares) shows a characteristic transient. The lines represent a non-linear least-squares fit to the data.
In a coupled spin system, the number of observed lines in a spectrum does not match the number of independent z magnetizations and, fiirthennore, the spectra depend on the flip angle of the pulse used to observe them. Because of the complicated spectroscopy of homonuclear coupled spins, it is only recently that selective inversions in simple coupled spin systems [23] have been studied. This means that slow chemical exchange can be studied using proton spectra without the requirement of single characteristic peaks, such as methyl groups. [Pg.2110]

BUTENE. As shown in Figure 38, a group attached to C-1 can migrate from position 1 to 3 (1,3 shift) to produce an isomer. If it is a methyl group, we recover a 1-butene. If it is a hydrogen atom, 2-butene is obtained. A third possible product is the cyclopropane derivative. The photochemical rearrangement of 1-butene was studied extensively both experimentally [88]... [Pg.372]

The hydroxyl hydrogen exchanges but the hydrogen atoms of the CH3 (methyl) group do not. [Pg.116]

Arsenic (but not antimony) forms a second hydride. This is extremely unstable, decomposing at very low temperatures. Replacement of the hydrogen atoms by methyl groups gives the more stable substance tetramethyldiarsane, cacodyl, (CH3)2As -AsfCHj), a truly foul-smelhng liquid. [Pg.227]

Pig. 2. By replacing the methyl group in p-methlyphenol with a series of softcore iiitcTaction sites it is possible to spread the range of configurations sampled to include configurations with and without a cavity in the para position. [Pg.155]

Fig. 3. Time evolution of the distance between the Zr atom and each of the three hydrogen atoms belonging to the methyl group (the original methyl group bonded to the Zr) in the zirconocene-ethylene complex. The time-evolution of one of the hydrogen atoms depicted by the dotted curve shows the development of an a-agostic interaction. Later on in the simulation (after about 450 fs) one of the other protons (broken curve) takes over the agostic interaction (which is then a 7-agostic interaction). Fig. 3. Time evolution of the distance between the Zr atom and each of the three hydrogen atoms belonging to the methyl group (the original methyl group bonded to the Zr) in the zirconocene-ethylene complex. The time-evolution of one of the hydrogen atoms depicted by the dotted curve shows the development of an a-agostic interaction. Later on in the simulation (after about 450 fs) one of the other protons (broken curve) takes over the agostic interaction (which is then a 7-agostic interaction).
In this simplified example of phenylalanine, in the first iteration the methyl groups arc given a value of I in the first classification step because they contain a primaiy C-atom, The methylene group obtains a value of 2, and the methine carbon atom a value of 3. In the second step, the carbon atom of the methyl group on the left-hand side obtains an extended connectivity (EC) value of 2 because its neighboring atom had a value of 2 in the first classification step. [Pg.61]

The c arlrnn atoms of the other two methyl groups (on the right-hand side) obtain an EC value of 3 because they arc adjacent to the racthinc carbon atom. The carbon atom of the methylene group obtains an EC value of 4 in the second rcla.xation process, as the sum (1 + 3) of the eonncctivity values of its neighboring atoms in the first iteration. [Pg.61]


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1 Carbon dioxide methyl groups

1.1- Dinitriles methyl groups

1.1.1- Trifluorides amines methyl groups

1.1.1- Trifluorides methyl groups

1.1.1- Trihalides methyl groups

19/3-Methyl group removal

2- methyl ester protect phosphate groups

A-Methyl group

Acetamido-methyl group

Acetate methyl group

Acetic formic anhydride methyl group reactions

Aldehydes (s. a. Formyl hydrocarbons (methyl groups

Aldehydes by oxidation at methyl groups

Aldehydes by oxidation of methyl group

Aldehydes from activated methyl groups

Alkylation methyl groups

Alkylation methyl-alkyl group

Alkylpyrroles methyl groups

Amino acids methyl group oxidation

Amino acids, methyl groups

Amino groups reductive methylation procedure

Ammoxidation of Methyl to Cyano Groups

Angular frequency methyl group

Angular methyl group

Angular methyl group oxidation

Aromatic contributions, methyl groups

Attaching a Methyl Group to Various Molecules

Attaching a methyl group to various hydrocarbons

Band assignments methyl groups

Benzene derivatives methyl groups

Bis methyl esters, to protect carboxyl groups

Bond strengthening, methyl groups effect

Bridging methyl groups

By oxidation of methyl groups

By the methyl group

C-Methyl groups

C3 methyl group

Carbon distribution, oxygen-methyl group

Carboxylic acids methyl groups

Carboxylic methyl groups)

Carboxylic methyl groups), oxidation

Chain-end methyl groups

Chiral methyl group

Chiral methyl groups analysis

Chiral methyl groups synthesis

Chiral methyl groups transfer

Chiral methyl groups, stereochemical analysis using

Choline methyl group source

Coherent tunneling methyl groups

Compounds with Activated Methyl, Methylene and Methine Groups

Conformational restriction methyl groups

Covalent hydration methyl group’s effect

Crystals methyl group tunneling

Cyclohexene methyl group influence

C—H Bending Vibrations Methyl Groups

Dehydration with methyl group

Derivative Methylthio) methyl group

Dimethylcadmium, methyl group

Eclipsed methyl group

Effect of methyl groups

Electronic effects methyl groups

Elimination methyl groups

Enones methyl group rotation

Erythromycin methyl group from methionine

Ethane methyl groups

Ether, methyl alcohol protecting group

Fluorinated methyl groups

Formate, active methyl groups from

Functionalization of steroid 18-methyl group

Functionalization of the angular methyl groups

Functionalization steroid methyl group

Group 17 elements Methyl halides

Group orbitals methyl

Hexamethyldialane bridging methyl groups

Hydration equilibrium, methyl group’s effect

Hydrocarbons methyl groups

Hydrocarbons, hydrocarbon methyl groups

Hydrocarbons, hydrocarbon nitriles (methyl groups

Hydrogenation reactions methyl groups

Hydroxymethyl compounds methyl groups

Hydroxymethylene compounds methyl groups

Influence of the 7-Methyl Group

Introduction Methyl groups, angular

Introduction of angular methyl groups

Isopropylidene methyl group

Labeling methyl group

Lateral methyl groups

Leucine methyl group

Lipophilicity methyl groups

Mass spectrometry methyl group cleavage

Mass spectrometry methyl groups

Metabohsm methyl groups

Methine/methylene/methyl groups

Methionine choline methyl groups from

Methionine methyl group synthesis

Methoxy-methyl groups

Methyl Chloroformate functional group protection

Methyl Groups, CH

Methyl and methylene groups

Methyl and methylene groups, active

Methyl blocking group

Methyl end group

Methyl ester group

Methyl esters carboxy-protecting groups

Methyl esters, to protect carboxyl groups

Methyl ether groups

Methyl ethers, as protecting groups

Methyl group 1,2-shift

Methyl group abstraction

Methyl group alkyl ligand

Methyl group charge stabilisation

Methyl group classification

Methyl group conformation

Methyl group conformational effects

Methyl group directing effect

Methyl group drug-receptor interactions

Methyl group electronics effects

Methyl group elimination reactions

Methyl group exchange

Methyl group extensions

Methyl group hyperconjugation

Methyl group inductive effect

Methyl group inside

Methyl group isotopic substitution

Methyl group metabolism

Methyl group migration

Methyl group molecular orbitals

Methyl group nucleophilic attack

Methyl group of acetyl-CoA

Methyl group of valine

Methyl group orienting effect

Methyl group oxidation pathways

Methyl group reactions

Methyl group reorientations

Methyl group rotation

Methyl group rotational tunneling

Methyl group solubility

Methyl group structure

Methyl group substitution reactions

Methyl group synthesis

Methyl group transfer

Methyl group transfer reactions

Methyl group transfer reactions, stereochemistry

Methyl group, 702 table

Methyl group, donor

Methyl group, infrared absorption

Methyl group, latent

Methyl group, model

Methyl group, model structure

Methyl group, oxidation

Methyl group, oxidation carbonyl

Methyl group, proton magnetic resonance

Methyl group, pyrolysis

Methyl group, reactivity with carbonyl compounds

Methyl group, resonances

Methyl group, thermodynamic

Methyl groups 1,3,5-triazine

Methyl groups acetic acids

Methyl groups activating effects

Methyl groups active

Methyl groups additivity rules)

Methyl groups angular, elimination

Methyl groups aromatization with

Methyl groups as substituents

Methyl groups compounds

Methyl groups condensation

Methyl groups cycle

Methyl groups cyclopropanes

Methyl groups derivatives

Methyl groups electron donating

Methyl groups free energy

Methyl groups frozen

Methyl groups geminal

Methyl groups group transfer

Methyl groups hindered rotation potential

Methyl groups hydroxymethyl

Methyl groups in coals

Methyl groups in methylcyclohexanes

Methyl groups polyethylene

Methyl groups protective function

Methyl groups reactivity

Methyl groups s. a. Hydrocarbons)

Methyl groups stabilization

Methyl groups stereospecific

Methyl groups substituent effects

Methyl groups suppl

Methyl groups symmetry

Methyl groups transportation

Methyl groups with anils

Methyl groups, 24 Aliphatic amines

Methyl groups, analytical determination

Methyl groups, attraction

Methyl groups, lateral substituents

Methyl groups, neighboring

Methyl groups, neighboring group participation

Methyl groups, scrambling

Methyl ivorensate group

Methyl methacrylate group transfer polymerisation

Methyl methacrylate with sulfonate group

Methyl side groups

Methyl sorbate group

Methyl sulfide groups, determination

Methyl-metal compounds Group

Methylation of carboxyl groups

Michael addition of methyl group

N-methyl group

Nicotine, methyl group precursor

Nitro compounds Methyl groups, active

Normal mode methyl groups

O-Methyl groups

O-Methyl-S-phenyl acetals and ketals protect carbonyl groups

Of methyl group

Ortho methyl group

Overtone methyl group

Oxidation methyl group, chromic acid

Oxidation of aromatic methyl groups

Oxidation of the methyl group

Oxygen-methyl group carbon

Planar methyl group

Platinum methyl group determination

Potential Methyl Groups

Propylene methyl group

Protecting group methyl ether

Protecting groups 1-methyl-1-methoxy) ethyl

Protective groups methyl ester

Pseudoaxial methyl group

Pyramidal methyl group

RAIRS methyl groups

Reaction at the Methyl Group

Rearrangements methyl group

Regioselectivity methyl groups

Relaxation methyl group rotation

Rem—Ring methyl groups

Scrambling of methyl groups

Selenium dioxide, oxidation methyl group

Shielding methyl groups

Solvent Effects in Methyl Group Transfers

Stereochemistry using chiral methyl groups

Steric aspects methyl groups

Steric effect of methyl group

Steric hindrance methyl group

Steroid 18-methyl groups

Steroids methyl groups, angular

Substances Containing Bridging Methyl Groups

Substituents methyl groups

Symmetrical Methyl Group Transfers in the Gas-Phase

TV-methyl group

The Methyl Formate Group

The methyl group and other nonpolar substituents

The study of chiral methyl groups

Toluene methyl group dehydrogenation

Transfer of the methyl group

Valine methyl group

Vibrational spectra methyl groups

Vibrations of Methyl Groups Attached to Elements other than Carbon

Vinyl methyl ketone, complexes with group

With Loss of a Methyl Group

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