Dinuclear μ-alkylidene complexes of transition metals as models for the transformation of CH2X2 (X = Cl, Br, I) into malonic acid derivatives by double carbonylation reactions
作者:B. Denise、D. Navarre、H. Rudler、J.C. Daran
DOI:10.1016/0022-328x(89)85121-6
日期:1989.10
mechanisms of both reactions are discussed. From the fraction involving 1 a mononuclear complex resulting from the dimerization of ketene has been isolated, and its structure established by an X-ray diffraction study. Olefins such as ethene and norbornene are able to trap the ketene intermediate. The possible participation of such μ-alkylidene complexes in the direct transformation of CH2X2 (X = Cl,
在各种条件下研究了μ-亚烷基络合物Fe 2(CO)8 CH 2)(1)和Pd 2 I 2(PPh 2 CH 2 PPh 2)2 CH 2(2)的羰基化。在醇ROH的存在下,配合物1主要产生单羰基化产物乙酸盐CH 3 CO 2 R,而在相同条件下,配合物2得到丙二酸酯CH 2(CO 2 R)2。,二羰基化的产物。讨论了两种反应的机理。从涉及1的馏分中分离出了由烯酮二聚化得到的单核络合物,并通过X射线衍射研究确定了其结构。烯烃(例如乙烯和降冰片烯)能够捕获烯酮中间体。讨论了此类μ-亚烷基络合物可能参与CH 2 X 2(X = Cl,Br,I)直接转化为丙二酸衍生物的过程。