Preparation of 3-thenyl bromide

DETAILED DESCRIPTION What is claimed is: 1.
A process for the selective bromination on an alkyl side-chain of an alkyl heterocyclic compound with a brominating agent selected from N-bromosuccinimide, 1,3-dibromo-5,5-dimethyl hydantoin and N-bromoacetamide in a solvent comprising carrying out said bromination in the presence of infrared light as an initiator for the free radical bromination reaction.
2.
The process of claim 1 further characterized in that said bromination reaction is carried out at elevated temperature.
3.
The process of claim 1 wherein said alkyl side-chain is an alkyl radical selected from methyl, ethyl, propyl and butyl radicals.
4.
The process of claim 1 wherein said alkyl heterocyclic compound is selected from an alkyl thiophene, an alkyl pyridine or an alkyl furan.
5.
The process of claim 4 wherein said alkyl heterocyclic compound is an alkyl thiophene.
6.
The process of claim 4 wherein said alkyl thiophene is a methyl thiophene.
7.
The process of claim 4 wherein said alkyl thiophene is 3-methylthiophene.
8.
The process of claim 7 further characterized in that the initial concentration of 3-methyl thiophene ranges from about 5 to about 20 percent by weight in said solvent.
9.
The process of claim 7 further characterized in that the initial concentration of 3-methyl thiophene ranges from about 5 to about 10 percent by weight in said solvent.
10.
The process of claim 7 further characterized in that the molar ratio of said brominating agent to said 3-methylthiophene is from 1:1 to about 1:3.
11.
The process of claim 7 further characterized in that the molar ratio of brominating agent to 3-methylthiophene is about 1:2.
12.
The process of claim 7 further characterized in that the initial concentration of 3-methylthiophene is from about 5 to about 20 percent by weight in said solvent and the molar ratio of said brominating agent to said 3-methylthiophene is from 1:1 to about 1:3.
13.
The process of claim 7 further characterized in that the initial concentration of 3-methylthiophene in said solvent is from about 5 to about 20 percent by weight and the molar ratio of said brominating agent to said 3-methylthiophene is about 1:2