Cobalt carbonyl catalyzed reactions of esters and lactones with hydrosilane and carbon monoxide. A novel synthetic method for the introduction of the siloxymethylidene group
作者:Naoto. Chatani、Satoru. Fujii、Yasuhiro. Yamasaki、Shinji. Murai、Noboru. Sonoda
DOI:10.1021/ja00283a035
日期:1986.11
monoxide took place except for bridgehead alkyl acetates. The mechanism of the catalytic reaction has been proposed, and the importance of the silycobalt carbonyl, R/sub 3/SiCO(CO)/sub 4/, as the key catalyst species has been suggested. The high affinity of the silicon in R/sub 3/SiCo(CO)/sub 4/ toward the oxygen atom in the ester is suggested to be the driving force for the formation of alkylcobalt carbonyls
酯和内酯与氢硅烷和一氧化碳在 Co/sub 2/(CO)/sub 8/ 存在下的催化反应已被详细研究,重点是它们在有机合成中的效用。乙酸仲烷基酯的催化反应经过一氧化碳的完全结合,得到(甲硅烷氧基亚甲基)烷烃(烯醇甲硅烷基醚)。仲烷基酯类型的内酯类似地反应。甲硅烷氧基甲基化产物转化为醛。乙酸伯烷基酯以非选择性方式产生多种产物。在叔烷基酯的情况下,除了桥头烷基乙酸酯外,没有发生一氧化碳的掺入。已经提出了催化反应的机理,以及羰基硅钴的重要性,R/sub 3/SiCO(CO)/sub 4/,作为已提出的关键催化剂种类。R/sub 3/SiCo(CO)/sub 4/ 中的硅对酯中氧原子的高亲和力被认为是形成作为中间体的烷基羰基钴的驱动力。这一步说明了一种形成碳-过渡金属键的新方法。