Preparation and Reactivity of Nickel(0) Complexes with η<sup>2</sup>-Coordinated Alkynylphosphines
作者:Martin A. Bennett、Jeffrey Castro、Alison J. Edwards、Mike R. Kopp、Eric Wenger、Anthony C. Willis
DOI:10.1021/om000895o
日期:2001.3.1
The η2-alkynylphosphine complexes [Ni(η2-Ph2PC⋮CR)(dcpe)] (R = Me (1a), CO2Me (1b), Ph (1c)), which are formed by displacement of ethylene from [Ni(C2H4)(dcpe)] by the corresponding alkynylphosphine, react with HCl (1 equiv) to give five-coordinate nickel(II) complexes, [NiClC(CHR)PPh2-κP,C1}(dcpe)] (R = Me (2a), CO2Me (2b), Ph (2c)), which contain a coordinated methylenephosphanickelacyclopropane
的η 2种-alkynylphosphine配合物[镍(η 2 -Ph 2 PC⋮CR)(DCPE)](R =我(1A),CO 2我(1B)中,Ph(1C)),其是由乙烯的位移形成从[镍(C 2 H ^ 4)(DCPE)]通过相应alkynylphosphine,用HCl反应(1当量),得到五配位的镍(II)配合物,[的NiCl C(CHR)PPH 2 -κ P,ç 1 }(dcpe)](R = Me(2a),CO 2 Me(2b),Ph(2c)),其中包含一个配位的亚甲基膦烷基环丙烷丙烷片段。在1a的情况下,质子在带有甲基的碳原子上区域特异性地加成。这种添加方式是有利的为1B,Ç,但少量加成产物[的NiCl η的1 - C ^(- [R )CH(PPH 2)} ...(DCPE)](R = CO 2我(图3b)中,Ph(也形成了由于在含PPh 2的碳原子上加成而产生的3c))。CS 2和CO