4′-dichlorobenzophenone, is an efficient pre-catalyst for the copper- and amine-free Sonogashira coupling between terminal acetylenes and aryl iodides and aryl and vinyl bromides achieving turnover numbers (TON) of up to 72000. Catalyst 8a has also been shown as a effective promoter for the sila-Sonogashira coupling between 1-(trimethylsilyl)alkynes and aryl iodides and bromides in the presence of CuI or
衍生自
4,4'-二氯二苯甲酮的
肟衍生的
氯桥式Palladacycle 8a是末端
乙炔与芳基
碘化物之间的无
铜和无胺Sonogashira偶联的有效预催化剂,达到了营业额(TON )最高可达72000。在CuI或Bu 4存在的情况下,催化剂8a还被证明是1-(三甲基甲
硅烷基)
炔烃与芳基
碘化物和
溴化物之间sila-Sonogashira偶联的有效
促进剂。NBr作为助催化剂。这种配合物还能在室温下以TONs高达1000的效率有效地催化
NMP中1-
炔烃之间的均偶联反应(Glaser型偶联)。所有反应均可在空气中进行,并在极低的负载条件下使用试剂级
化学物质,证明了
肟衍生的palladacycles的多功能性和高活性。