Chemistry:Telomerization

Short description: Chemical reaction producing oligomers with two distinct end groups

Telomerization is a reaction that produces a particular kind of oligomer with two distinct end groups. The oligomer is called a telomer. Some telomerizations proceed by radical pathways, many do not. A generic equation is:

[math]\ce{ A-B + n M -> A-M_{n}-B }[/math]

where M is the monomer, and A and B are the end groups, and n is the degree of polymerization.

One example is the coupled dimerization and hydroesterification of 1,3-butadiene. This step produces a doubly unsaturated C9-ester:

2 CH₂=CH-CH=CH₂ + CO + CH₃OH → CH₂=CH(CH₂)₃CH=CHCH₂CO₂CH₃

The monomer in this reaction is butadiene, the degree of polymerization is 2, and the end groups are vinyl and the carboxy methyl (CO₂CH₃). This and several related reactions proceed with palladium catalysts. Many telomerizations are used in industrial chemistry.

Nomenclature

According to the jargon in polymer chemistry, telomerization requires a telogen to react with at least one unsaturated taxogen molecule. Fluorotelomers are an example.

See also

• Perfluorooctanoic acid (synthesis)
• Telomerization (dimerization)