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本文通过比较一系列稀土催化体系:Nd(naph)_3—Al(i—Bu)_3—Al_2Et_3Cl_3(Ⅰ),Nd(naph)_3—Al(i-Bu)_2H—Me_2sicl_2(Ⅱ),Nd(OPr~i)Cl_2—AlEt_3(Ⅲ)和Nd(OPr~i)_2Cl—AlEt_3(Ⅳ)催化活性与定向性的关系,发现稀土聚异戊二烯(稀土异戊胶)顺式-1,4链节含量(A%)与稀土催化剂活性(绝对增长速度常数K_P)存在一线性关系:A=1.94lgK_P+88,即稀土异戊胶顺式-1,4链节含量随催化剂活性的增高而增加。但当催化活性高达一定程度后,异戊胶顺式-1,4链节含量基本不再变化,A%为94～95%。
In this paper, a series of rare earth catalytic systems were compared: Nd (naph) _3-Al (i-Bu) _3-Al_2Et_3Cl_3, Nd_ran_2_Me_2sicl_2, ~ i) The relationship between the catalytic activity and orientation of Cl_2-AlEt_3 (Ⅲ) and Nd (OPr_i) _2Cl-AlEt_3 (Ⅳ) There is a linear relationship between the content (A%) and the activity of rare earth catalyst (absolute growth rate constant K_P): A = 1.94lgK_P + 88, that is, the content of cis-1,4 linkages increases with the increase of catalyst activity . But when the catalytic activity up to a certain extent, the content of isoprenoid cis-1,4 chain basically no longer changes, A% of 94 to 95%.