An allylic carbon is a carbon atom bonded to a carbon atom that in turn is doubly bonded to another carbon atom.
The allylic carbon is bonded to a carbon atom which is doubly bonded to another carbon atom. The general formula for allyl is R-CH2-CH=CH2 in which the asterisk carbon atom is an allylic carbon atom.
Allyl and vinyl are two different organic functional groups. Both have C-C double bonds but in different positions. In vinyl group, C=C is directly attached to the rest of the chain. In contrast to vinyl, allyl group is attached to the rest of the molecule through –CH2 group.
Allylic position: In a molecule, the position next to an alkene. The allylic positions are labeled with asterisks. Allyl chloride. Related terms: Allyl group, benzylic position, propargylic position, vinylic position, alkene.
Allylic carbon is a carbon atom bonded to a carbon atom that in turn is doubly bonded to another carbon atom. Vinylic carbon is a carbon that is involved in a double bond with another carbon.
A benzylic carbon is a saturated carbon residing on an aryl group in an organic species.
Vinyl ic position: On, or bonded to, the carbon of an alkene. This molecule has four vinyl ic positions, each marked with *. Lewis structure of vinyl chloride, a vinyl ic halide. Related terms: Vinyl group, vinylic hydrogen, vinylic carbocation, allylic position, benzylic position, propargylic position. Wikipedia entry.
The positions adjacent to alkene C=C often show enhanced reactivity compared to simple alkanes due to the proximity of the adjacent π system. Such positions are referred as ” allylic “. In contrast, recall that the term ” vinylic ” is used to described the atoms directly associated with the C=C unit.
A secondary allylic carbocation will be more stable than an aliphatic secondary allylic because it has the same moral support AND resonance. Tertiary allylic will be even more stable.
The short answer is Allyl carbonation is more stable than Vinyl carbocation bacuse Allyl carbocation is resonance stabilised where as in case of vinyl carbocation, the positive charge on sp hybridized carbon, which is highly unstable.
Allyl group contains sp3 hybridized allylic carbon atoms and sp2 hybridized vinyl carbon atoms. The allylic carbon atom is more reactive than normal alkanes. An alkyl group is a molecule with the general formula CnH2n+1, where n is integer.
Vinyl chloride monomer (VCM) is the key chemical precursor to PVC. It is produced commercially by combining a hydrocarbon feedstock, namely ethylene, obtained by cracking natural gas or petroleum, with elemental chlorine. Chlorine is derived from brine – a solution of common salt and water.
An allylic group is a group on a carbon adjacent to a double bond. A benzylic group is a group on a carbon adjacent to a benzene ring or substituted benzene ring. In many situations allylic and benzylic groups are unusually reactive.
An allylic hydrogen is a hydrogen atom that is bonded to an allylic carbon in an organic molecule.
As a result, benzylic and allylic carbocations (where the positively charged carbon is conjugated to one or more non-aromatic double bonds) are significantly more stable than even tertiary alkyl carbocations.