in quantitative yield. Solution NMR data of the methyl complexes 5b,c indicate the presence of both cis and trans isomers; the major component of 5b is cis whereas that of 5c is trans. In contrast, complexes 6b,c, 7b,c, and 8c all exist exclusively in the trans form. The chloro complexes 2b–d are all active catalyst precursors for Kumada couplings under mild conditions. In particular, this catalysis
一系列包含(o -ArNC 6 H 4 PR 2)-(1a,Ar = 2,6-C 6 H 3 Me 2,R = Ph; 1b,Ar = 2, 6-C 6 H 3 i Pr 2,R = Ph; 1c,Ar = 2,6-C 6 H 3 Me 2,R = i Pr; 1d,Ar = 2,6-C 6 H 3 i Pr 2, R =我Pr)已经制备并在结构上表征。从NiCl 2(
DME)与Li [ 1b - d ]的反应中以高收率分离出呈砖红色微晶的二聚
氯化镍衍
生物[ 1b - d ] Ni(μ-Cl)} 2(2b - d)。NEt 3存在时(solv)x或H [ 1b – d ] 。采用[ 1a ] -的类似反应产生了均相Ni [ 1a ] 2(3a)作为顺磁性,深红色棱镜,产率很高。在室温下,将
三甲基膦添加到2b,c在THF中的红色溶液中,得到[ 1b,c ] NiCl(PMe 3)的
祖母绿晶