An allyl group is an alkenehydrocarbon group with the formula H2C=CH-CH2-. It is made up of a vinyl group, CH2=CH-, attached to a methylene -CH2. For example allyl alcohol has the structure H2C=CH-CH2OH . Compounds containing the allyl group are often referred to as being allylic. The position where the allyl group attaches (next to the OH in allyl alcohol) is called the allylic position. An alkene is an unsaturated hydrocarbon containing at least one carbon-carbon double bond. ... // Definition In chemistry, a hydrocarbon is any chemical compound that consists only of carbon (C) and hydrogen (H). ... A vinyl is an organic molecule containing a vinyl group: H R / C = C / H H where R represents a functional group such as a hydrocarbon or halogen. ... In chemistry, methylene is di-valent functional group CH2 derived formally from methane. ...
Substituted versions of the above, such as the trans-but-2-en-1-yl or crotyl group (CH3CH=CH-CH2-) may be also referred to as allylic groups.
Allyl isothiocyanate is the chemical compound responsible for the pungent taste of mustard, horseradish and wasabi.
Allyl isothiocyanate serves the plant as a defense against herbivores; since it is harmful to the plant itself, it is stored in the harmless form of the glucosinolate, separate from the myrosinase enzyme.
Synthetic allyl isothiocyanate is used as an insecticide, as an animal repellant, to denature alcohol, and as a topical anesthetic.
Allyl alcohol can be obtained by hydrolysis of allyl chloride or by oxidation of propylene oxide with potassium alum at high temperature or by a dehydration reaction with propanol or by reaction of glycerol and formic acid.
Allyl alcohol is the smallest representative of the allylic alcohols.
Allyl alcohols can be prepared by allylic oxidation of allyl compounds by for instance selenium dioxide.
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