CC Insertion: Insertion of an Alkyne into the CC Single Bond between the Carbene-Carbon Atom and the -Carbon Atom of a Fischer Carbene Complex by an Unprecedented Metalla(di-π-methane) Skeletal Rearrangement
作者:Seda Ünaldi、Rudolf Aumann、Roland Fröhlich
DOI:10.1002/chem.200304767
日期:2003.7.21
The first examples of insertion of a C(triple bond)C bond of an alkyne into a C(carbene)-Calpha single bond of a carbene complex (C-Calpha insertion) are reported. (prim-Alkyl)carbene complexes [(OC)(5)M=C(OEt)CH(2)R] (1 a-f; M=Cr, W; R=nPr, C(7)H(7), Ph) undergo C-Calpha insertion of electron-deficient alkynes [PhC(triple bond)CC(XEt)NMe(2)]BF(4) (5 a,b; X=O, S) to give zwitterionic carbiminium carbonylmetalates
报道了炔烃的C(三键)C键插入卡宾络合物的C(卡宾)-Cα单键中的第一个例子(C-Calpha插入)。(伯烷基)卡宾络合物[(OC)(5)M = C(OEt)CH(2)R](1 af; M = Cr,W; R = nPr,C(7)H(7),Ph )进行C-Calpha插入电子不足的炔烃[PhC(三键)CC(XEt)NMe(2)] BF(4)(5 a,b; X = O,S)得到两性离子碳亚基羰基金属羰基化物3 ag,通过消除CO将其热转化为(4ag)(CO)(4)M螯合卡宾碳烯配合物。整个反应具有高度的区域选择性和立体选择性。它涉及前所未有的金属(二-对-甲烷)重排,这是关键步骤。