Anionic polymerization initiator, use thereof for synthesizing a diene elastomer having an alkyne function at the chain end, and functionalized diene elastomer

摘要

An anionic polymerization initiator of formula:;in which:Met, which can be borne by the ortho, meta or para position, denotes an alkali metal, R1 and R2, and also R3 and R4, which can be borne by the ortho, meta or para position, denote a hydrogen atom or an alkyl, cycloalkyl, aryl or arylalkyl group, and R5 denotes an alkyl, cycloalkyl, aryl or arylalkyl group or a protective group for the alkyne functional group.;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.

主权项

1. A process for the synthesis of a diene elastomer bearing, at one or each of its chain ends, a group comprising an alkyne functional group, comprising the anionic polymerization of at least one conjugated diene monomer initiated by an organometallic compound comprising an alkyne bond of formula 1:wherein
Met, which can be borne by the ortho, meta or para position with respect to the group comprising the carbon-carbon triple bond, denotes an alkali metal, and R1 and R2, and also R3 and R4, which can be borne by the ortho, meta or para position, denote, independently of one another, a hydrogen atom, a C1-C15 alkyl group, a C5-C15 cycloalkyl group, a C6-C15 aryl group or a C7-C15 arylalkyl group which can be separated from the aromatic nucleus by a heteroatom, and R5 denotes a C1-C5 alkyl group, a C5-C15 cycloalkyl group, a C6-C15 aryl group, a C7-C15 arylalkyl group or a protective group for the alkyne functional group.