Allylic Vs Vinylic Hydrogen

Key difference allyl vs vinyl both allyl and vinyl groups have slightly similar structures with a small variation.

Allylic vs vinylic hydrogen.

Allyl groups have three carbon atoms and five hydrogen atoms. The name is derived from the latin word for garlic allium sativum in 1844 theodor wertheim isolated an allyl derivative from garlic oil and named it schwefelallyl. Allyl indicates a functional group with structural formula h 2 c ch ch 2 r where r is the rest of the molecule it consists of methylene bridge ch 2 in between the vinyl group ch ch 2 and the rest of the molecule therefore allyl group contains sp 2 hybridized vinyl carbon atoms and sp 3 hybridized allyl carbon atom. Benzylic position allylic position propargylic position aryl aryl hydrogen.

The libretexts libraries are powered by mindtouch and are supported by the department of education open textbook pilot project the uc davis office of the provost the uc davis library the california state university affordable learning solutions program and merlot. Allyl group holds three carbon atoms and five hydrogen atoms on the other hand vinyl group has two carbon atoms and three hydrogen atoms. The vinylic hydrogens are shown in red. An allyl group is a substituent with the structural formula h 2 c ch ch 2 r where r is the rest of the molecule.

Allyl form a stable carbocation because of the electron delocalization whereas vinylic carbocations are unstable as they lack p character. The allylic carbon atom is more reactive than normal. It consists of a methylene bridge ch 2 attached to a vinyl group ch ch 2. Identify the number of allylic and vinylic hydrogens in the pictured molecules.

An allylic hydrogen is a hydrogen atom that is bonded to an allylic carbon in an organic molecule. Both groups own a double bond between two carbon atoms where all the other atoms are bonded through single bonds. The key difference between these two structural components is the number of carbon and hydrogen atoms. A hydrogen atom bonded to an sp 2 carbon of an alkene.

The allylic carbon is bonded to a carbon atom which is doubly bonded to another carbon atom. The key difference between allylic and vinylic carbon is that allylic carbon is the carbon. The general formula for allyl is r ch 2 ch ch 2 in which the asterisk carbon atom is an allylic carbon atom. None of the other hydrogens are vinylic.