Synthesis of nickel phenyl complexes with new chelating κ2-P, N ligands derived from α-iminoazatriphenylphosphoranes
作者:Pierre Braunstein、Jörg Pietsch、Yves Chauvin、André DeCian、Jean Fischer
DOI:10.1016/s0022-328x(96)06656-9
日期:1997.2
Reactions of the phosphorus ylide Ph3PNC(NPh)Ph (3), conveniently prepared in high yield from Ph3PNLi and ClC(NPh)Ph, with [Ni(COD)2] in the presence of a tertiary phosphine yielded the complexes [NiPhPh2PN=C(N¯Ph)Ph}NPh[=CPh(N=PPh3)]}] (5) and [NiPhPh2PN=C(N¯Ph)Ph}(PR3)] (PR3 = PMe3 (6a), PMe2Ph (6b), PMePh2 (6c)) which result from oxidative addition of a PPh bond to the Ni(0) centre. When PTol3
在叔膦的存在下,方便地由Ph 3 PNLi和ClC(NPh)Ph高产率地制备的磷酰磷Ph 3 PNC(NPh)Ph(3)与[Ni(COD)2 ]的反应产生了配合物[NiPh Ph2PN = C(ŃPh)Ph} NPh [= CPh(N = PPh3)]}] (5)和[NiPh Ph2PN = C(ŃPh)Ph}(PR3)] (PR 3 = PMe 3(6a),PMe 2 Ph(6b),PMePh 2(6c)),其是通过将PPh键氧化加至Ni(0)中心而产生的。当使用PTol 3时,只有5可以分离出来,而其他膦则根据其空间需求而生成相应的配合物6a-c和5的变化量。所述的反应Ñ 甲基化的磷叶立德Ph3P = N-C [= N(O-C6H4)NME] (1-甲基-2-(triphenylphosphoranylideneamino)苯并咪唑(7)),与[镍(COD)2 ]在PTol 3的存在产生了络合物[NiPh