preparation of NiCRA (NaH-t-AmONa-Ni(OAc)2) in the presence of 2,2′-bipyridine (bpy) leads to a new reagent (termed NiCRA-bpy) which is shown to be one of the most efficient Ni based reagents reported so far for the homocoupling of aryl and vinyl halides (including chlorides). The homo coupling of cis- and trans-β-bromostyrenes is shown to be stereospecific.
在
2,2'-联吡啶(bpy)存在下制备NiC
RA(NaH-t-AmONa-Ni(
OAc)2)会产生一种新的试剂(称为NiC
RA-bpy),该试剂被证明是最有效的试剂之一迄今为止,已报道了一种高效的基于Ni的试剂,用于芳基卤化物和
乙烯基卤化物(包括
氯化物)的均偶联。顺式和反式-
β-溴苯乙烯的均相偶联显示是立体特异性的。