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Telomerisation reaction introduced for the first time by Handford in 1942. In contrast to polymerisation, usually leads to low molecular weight polymers, called telomers, or even to monoadducts with well-defined end-groups. Such a products (Mn) are obtained from the reaction between a telogen or a transfer agent (X-Y), and one or more (n)molecules of a polymerisable compound M (called a taxogen or monomer) having ethylenic unsaturation under radical polymerisation conditions as follows: X - Y + nM → X - (M)n - Y