Insertion into the nickel-carbon bond of NO chelated arylnickel(II) complexes. The development of single component catalysts for the oligomerisation of ethylene
作者:Sylvie Y. Desjardins、Kingsley J. Cavell、Hong Jin、Brian W. Skelton、Allan H. White
DOI:10.1016/0022-328x(95)06105-6
日期:1996.5
for the complexes indicate that both complexes have “square planar” coordination about the nickel centre, with the nitrogen of the pyridine being trans to the phosphine in each case. Whereas significant bending and buckling of the six-membered chelate ring is evident for [Ni(mesityl)(pyac)PMePh2], the five-membered ring of [Ni(mesityl)(pyca)PMePh2] is essentially planar. On warming the complexes readily
[NiAr(NO)L]类型的一系列含有螯合Nz.sbnd; O配体的芳基镍膦配合物[N = O =吡啶羧酸盐(pyca); Ar =邻甲苯基; L = PPh 3,P(CH 2 Ph)3,PMePh 2,PMe 2 Ph,PCy 3:R =对甲苯基;L = PPh 3:Ar =苯基;L = PPh 3:R =均三;L = PMePh 2:N = O =乙酸吡啶(pyac);在= mesityl; L = PMePh 2已经制备了[1],提供了具有5和6的螯合环大小的复合物。对于复合物的晶体结构表明,这两个配合物具有大约镍中心“方形平面的”协调,与吡啶的存在的氮的反式在每种情况下的膦。而显著弯曲和六元螯合环的屈曲为[镍(均三甲苯基)(pyac)PMePh明显2 ],五元环[镍(均三甲苯基)(的pycA)PMePh 2基本上是平面的。在加热时,络合物容易将乙烯插入Ni-芳基键,形成单组分催化剂