Chapter 8.6: Allylic Halogenation

Question 1

What is a carbon adjacent to a carbon-carbon double bond?

Answer 1

allylic carbon

Question 2

Describe the mechanism of allylic halogenation

Answer 2

o Step 1: Chain Initiation
 Chain initiation involves formation of radicals from NBS by light-induced hemolytic cleavage of the N—Br bond in NBS
o Step 2: Chain Propagation
 Chain propagation involves the formation of products. Reaction of a radical and a nonradical gives a new radical.
o Step 3: Chain Termination—The Destruction of Radicals
 Propagation if the chain reaction continues until termination steps produce nonradical products and this stop further reaction.

Question 3

What is any reaction in which an atom or group of atoms is substituted for another atom or group of atoms at an allylic carbon?

Answer 3

allylic substitution

Question 4

Define allylic substitution

Answer 4

any reaction in which an atom or group of atoms is substituted for another atom or group of atoms at an allylic carbon

Question 5

Define allylic carbon

Answer 5

a carbon adjacent to a carbon-carbon double bond