Abstract The first functional cross-metathesis (CM) depolymerization of commercial (co)polydienes using a ruthenium catalyst and an acyclic bis(trialkoxysilyl) difunctionalized chain-transfer agent (CTA), [(EtO) 3 Si(CH 2 ) 3 NHC(O)OCH 2 CH ] 2 ( 1 ), towards the synthesis of low viscosity liquid α,ω-bis(trialkoxysilyl) telechelic (co)polydienes is reported. The reactivity of three commercial grades of liquid (co)polydienes ( P1 – P3 , polybutadienes (PBDs) or poly(butadiene- co -isoprene) (P(BD- co -IP))) differing in their end-functionalization, in the amount of 1,2-vinyl and in their dispersity, was explored. Operating conditions for effective production of α,ω-bis(trialkoxysilyl) telechelic PBDs or P(BD- co -IP)s with high chemoselectivity (80–90 wt%) and catalytic productivity (non-optimized TON up to 24 000) were established. The chemoselectivity of this tandem metathesis reaction was assessed in particular through detailed 2D NMR analyses. An original approach combining the CM depolymerization of PBD with the ring-opening functional metathesis polymerization (ROMP) of a cycloolefin in the presence of CTA 1 has also been next implemented affording low viscosity liquid α,ω-bis(trialkoxysilyl) telechelic copolydienes. The viscosity of the (co)polyolefins was investigated by rheological analyses.

中文翻译：

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从钌催化的聚二烯交叉复分解聚合中简单地获得烷氧基甲硅烷基遥爪聚烯烃

摘要 使用钌催化剂和无环双（三烷氧基甲硅烷基）双官能化链转移剂（CTA），[(EtO) 3 Si(CH 2 ) 3 NHC( O)OCH 2 CH ] 2 ( 1 )，用于合成低粘度液体α,ω-双(三烷氧基甲硅烷基)遥爪(共)聚二烯。三种商业级液体（共）聚二烯（P1 – P3、聚丁二烯 (PBD) 或聚（丁二烯-共-异戊二烯）（P（BD-co-IP））的反应性在末端官能化方面有所不同，在研究了 1,2-乙烯基的量及其分散性。有效生产具有高化学选择性（80–90 wt%）和催化生产率（未优化的 TON 高达 24 000）的 α,ω-双（三烷氧基甲硅烷基）遥爪 PBD 或 P（BD-co-IP）的操作条件为已确立的。该串联复分解反应的化学选择性特别通过详细的 2D NMR 分析进行评估。接下来还实施了在 CTA 1 存在下将 PBD 的 CM 解聚与环烯烃的开环功能易位聚合 (ROMP) 相结合的原始方法，提供低粘度液体 α,ω-双（三烷氧基甲硅烷基）遥爪共聚二烯。(共)聚烯烃的粘度通过流变分析来研究。