CH2CHCH2R
CH2CHCH2R denotes an allyl substituent, typically written as CH2=CH-CH2-R, where R represents the rest of the molecule. Systematically, this group is called the prop-2-en-1-yl group and is commonly referred to as the allyl group. The three-carbon fragment features a terminal double bond and a methylene connecting to R, placing the CH2 adjacent to the double bond in an allylic position.
The allylic position in CH2=CH-CH2-R is stabilized by resonance, which makes allylic substrates particularly reactive in
Nomenclature and related groups
When the allyl fragment is bound to a larger molecule, the substituent is called allyl or prop-2-en-1-yl.
Allyl groups are versatile in organic synthesis. They enable efficient allylation reactions, including palladium-catalyzed allylic substitutions,
Allyl compounds vary in hazard; many are irritants or reactive with air. Proper handling and disposal per
Allyl group; allylation; prop-2-en-1-yl; Trost reaction; allylic substitution.