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In chemistry, a methyl group is a hydrophobic alkyl functional group derived from methane (4). It has the chemical formula -3 and is very often abbreviated as -Me in the structure of a molecule. This hydrocarbon unit can be found in many organic compounds. It is customarily written as H3C when on the left of a bond; for example, ethane is represented as H3C-CH3.

Methyl groups can be incorporated in organic compounds by an Nucleophilic substitution on iodomethane, or by the reaction of methyl lithium or MeMgCl with a carbon atom that is substituted with a leaving group.

Reactivity The introduction of methyl groups as new substituents in a compound usually increases the lipophilicity of the compound and reduces its water solubility. It should improve the ease of absorption of the analogue into a biological membrane but will make its release from biological membranes into the aqueous media more difficult. The incorporation of a methyl group can have one of three general effects on the rate of metabolism of an analogue:

an increased rate of metabolism due to oxidation of the methyl group

an increase in the rate of metabolism due to demethylation by the transfer of the methyl group to another compound, or a reduction of the analogue.

Chemically, the reactivity of a methyl group depends partially on what it is attached to. For example, when a methyl group is part of an alkane, it is extremely unreactive and resists all but the strongest of acids, bases, oxidizing agents, and reducing agents. However, in the compound toluene, phenylCH3, the methyl group is considerably more reactive due to the electron donating abilities of the ring. electrophile reagents are then able to attack the methyl group; for example, oxidation with permanganate converts the methyl group to carboxyl (-COOH), which produces benzoic acid.

Methyl radical The methyl radical is the substance CH3 on its own, with an unpaired electron. Though it readily dimerizes to ethane, it is stable enough (unlike atomic hydrogen) to be observed as a dilute gas. It can be produced by thermal decomposition of certain compounds, especially those with a -N=N- linkage, which lose the extremely stable dinitrogen molecule on heating.

See also

• methanol#History for the etymology of methyl

In chemistry, a methyl group is a hydrophobic alkyl functional group derived from methane (4). It has the chemical formula -3 and is very often abbreviated as -Me in the structure of a molecule. This hydrocarbon unit can be found in many organic compounds. It is customarily written as H3C when on the left of a bond; for example, ethane is represented as H3C-CH3.

Methyl groups can be incorporated in organic compounds by an Nucleophilic substitution on iodomethane, or by the reaction of methyl lithium or MeMgCl with a carbon atom that is substituted with a leaving group.

Reactivity The introduction of methyl groups as new substituents in a compound usually increases the lipophilicity of the compound and reduces its water solubility. It should improve the ease of absorption of the analogue into a biological membrane but will make its release from biological membranes into the aqueous media more difficult. The incorporation of a methyl group can have one of three general effects on the rate of metabolism of an analogue:

an increased rate of metabolism due to oxidation of the methyl group

an increase in the rate of metabolism due to demethylation by the transfer of the methyl group to another compound, or a reduction of the analogue.

Chemically, the reactivity of a methyl group depends partially on what it is attached to. For example, when a methyl group is part of an alkane, it is extremely unreactive and resists all but the strongest of acids, bases, oxidizing agents, and reducing agents. However, in the compound toluene, phenylCH3, the methyl group is considerably more reactive due to the electron donating abilities of the ring. electrophile reagents are then able to attack the methyl group; for example, oxidation with permanganate converts the methyl group to carboxyl (-COOH), which produces benzoic acid.

Methyl radical The methyl radical is the substance CH3 on its own, with an unpaired electron. Though it readily dimerizes to ethane, it is stable enough (unlike atomic hydrogen) to be observed as a dilute gas. It can be produced by thermal decomposition of certain compounds, especially those with a -N=N- linkage, which lose the extremely stable dinitrogen molecule on heating.

See also

• methanol#History for the etymology of methyl

Methyl group - Wikipedia, the free encyclopedia
In chemistry, a methyl group is a hydrophobic alkyl functional group named after methane (C H 4). It has the formula-C H 3 and is often abbreviated -Me.

Definition: methyl group from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.

metaSHARK: Activated methyl group
nets: Aminophosphonate metabolism Biosynthesis of type II polyketide products Histidine metabolism Selenoamino acid metabolism Streptomycin biosynthesis

Methyl Group
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Strathprints - Methyl group influence on the formation of CuI ...
In order to investigate the effect of methyl group substitution adjacent to a pyridyl N donor, three ligands were synthesised and complexed with CuI in a 1:2 ratio. The crystal ...

Methyl group rotation and whole molecule dynamics in methyl bromide ...
Methyl rotational tunnelling, quasielastic scattering and phonon spectroscopy with neutrons at energies from 40 µeV to 200 meV is used to...

Definition: methyl from Online Medical Dictionary
methyl < chemistry > Specific reference to the methyl group is made when macromolecules are modified after synthesis by enzymic addition of methyl groups.

Methyl group - Psychology Wiki
In biochemistry, a methyl group is a hydrophobic alkyl functional group derived from methane (CH4). It has the formula -CH3 and is very often abbreviated as -Me in the structure of ...

Methyl Group (-ch3) - What does ME stand for? Acronyms and ...
Acronym Definition; ME: Maine (US postal abbreviation) ME: Medical Examiner: ME: Middle East: ME: Middle English: ME: Millennium Edition (Microsoft Windows) ME: Macro Economics

Glossary: Methyl group
In chemistry a methyl-group is an alkyl functional group with the formula -CH3 ... In chemistry a methyl-group is an alkyl functional group with the formula -CH 3.