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.
What is allylic and vinylic.
The key difference between allylic and vinylic carbon is that allylic carbon is the carbon atom adjacent to the double bonded carbon atom whereas vinylic carbon atom is one of the two atoms that share the double bond.
The positions adjacent to alkene c c often show enhanced reactivity compared to simple alkanes due to the proximity of the adjacent π system.
At the same time both these functional groups also share some similarities like both of them hold double bond between carbon atoms whereas the other atoms are bonded through single bond.
Both have c c double bonds but in different positions.
Allyl and vinyl are two different organic functional groups.
In vinyl group c c is directly attached to the rest of the chain.
Allyl and vinyl are the two different organic functional groups that hold differentiable characteristic and features.
In contrast to vinyl allyl group is attached to the rest of the molecule through ch2 group.