| abstract |
An anionic polymerization initiator of formula: n n n n n n n n n n n n in which: n Met, which can be borne by the ortho, meta or para position, denotes an alkali metal, R 1 and R 2 , and also R 3 and R 4 , which can be borne by the ortho, meta or para position, denote a hydrogen atom or an alkyl, cycloalkyl, aryl or arylalkyl group, and R 5 denotes an alkyl, cycloalkyl, aryl or arylalkyl group or a protective group for the alkyne functional group. n n n n n The use of such a polymerization initiator makes possible the synthesis of a diene elastomer bearing, at one or each of its chain ends, a group comprising an alkyne functional group with a high degree of functionalization. |