Formation of (Diphenylphosphino)naphthalenes by Double Insertion of (Alkynyl)diphenylphosphines into Nickel(0)−Benzyne Complexes
作者:Martin A. Bennett、Christopher J. Cobley、A. David Rae、Eric Wenger、Anthony C. Willis
DOI:10.1021/om990749m
日期:2000.4.1
nickel(0)−benzyne bond of the complexes [Ni(1,2-η)-4,5-X2C6H2}(PEt3)2] (X = H (1a), F (1b)) to give mixtures of nickel(0) complexes containing (diphenylphosphino)naphthalenes, which in some cases are formed with high regioselectivity. Bromination of the mixtures of nickel(0) complexes obtained from Ph2PC⋮CR (R = Me, Ph) and 1a or 1b gives in high yield the chelate NiBr2 complexes [NiBr26,7-X2C10H2-1,4-Y2-2
(炔基)二苯基膦Ph 2 PC⋮CR(R = H,Me,Ph,PPh 2)两次插入配合物[Ni (1,2-η)-4,5 -X 2 C 6 H 2 }(PEt 3)2 ](X = H(1a),F(1b))得到含有(二苯基膦基)萘的镍(0)配合物的混合物,在某些情况下,该配合物的生成量很高区域选择性。由Ph 2 PC⋮CR(R = Me,Ph)和1a或1b获得的镍(0)配合物的混合物进行溴化,可高收率地螯合NiBr 2配合物[NiBr 26,7-X 2 C 10 H 2 -1,4-Y 2 -2,3-(PPh 2)2 }](X = H,Y = Me(6a),Ph(11a); X = F ,Y = Me(6b),Ph(11b)),可以通过在60℃下在DMSO中用NaCN处理而释放出相应的1,4-二取代的2,3-萘撑双(二苯基膦)12a,13a,12b和13b。或室温下的二甲基乙二肟/氨气。仅其中一个磷原子被氧化的衍生物6