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以4种不同结构的α-二亚胺镍(Ⅱ)催化剂[(t—Bu)-N=CH—CH=N-(t—Bu)]NiBr2(Cl),[C6H5-N—C(Me)-C(Me)-N=C6H5]NiBr2(C2),[(2,6-C6H3(Me)2)-N=C(Me)-C·(Me)=N-(2,6-C6H3(Me)2)]NiBr2(C3)和[(2,6-C6H3(i—Pr)2)-N=C(An)-C(An)-N=(2,6-C6H3(i—Pr)2)]NiBr2(An=acenaphthyl)(C4),在甲基铝氧烷(MAO)作用下,对甲基丙