temperature. No isomerization or cross-linking reactions are observed, and addition of a chain transfer reagent (1-hexene) or the use of THF as a solvent does not decrease the stereospecificity of the polymerizations. Cis, syndiotactic and cis, isotactic poly(DCPD)s can be distinguished readily from each other by 13C NMR spectroscopy. Hydrogenation of each stereoregular poly(DCPD) produces H-poly(DCPD)s that
我们报告的开环复分解聚合(ROMP)的检查内切10良好定义的基于
钨钼基和亚烷基16
引发剂的二
环戊二烯(DCPD)。五种具有通式W(X)(CHCMe 2 Ph)(Me 2 Pyr)(OAr)的
钨基
MAP(单芳基
吡咯化物)
引发剂(X =芳基
酰亚胺,烷基亚
氨基或氧代; Me 2 Pyr =
2,5-二甲基吡咯化物;发现OAr =芳基氧化物)可产生> 98%的顺式,> 98%的间规聚(DCPD);它们是W(N- t- Bu)(CHCMe 3)(pyr)(OH
MT)(2,OH
MT = O-2,6-(2,4,6-Me 3 C 6 H 2)2 C 6 H 3,pyr =
吡咯化物),W(N-2,6- i -Pr 2 C 6 H 3)(CHCMe 2 Ph)(pyr)(OH
MT)(3),W(O)(CHCMe 2 Ph)(Me 2 Pyr)(OH
MT)(PPh 2 Me)(7,Me 2 Pyr =
2,5-二甲基吡咯化物),W(O)(CHCMe