Abstract: Liquid polybutadiene. telomers (M.W.2000-4000) are synthesized using n-BuLi as inititator, toluene as solvent and chain transfer agent with the addition of different polar modifiers 2G. 4G and HMPA. The effects of polar modifiers on the butadiene telomerization reaction are investigated in detail. Based on the results of synthesis a new model of chain transfer is proposed,and on this basis the chain transfer constants are calculated.