copolymerization (rho p = -0.8). The ratio of chain transfer to chain propagation was found to increase with styrene concentration and decrease with CO concentration. Polymer end group analysis showed the presence of alpha, beta-enone end groups. The reactivity of model systems, coupled with a study of the effect of added acetonitrile, support a chain transfer mechanism involving beta-hydrogen transfer
[[(1,10-
菲咯啉)Pd(CH(3))(CH(3)CN)](+)[BArF](-)(1a)和[(2,2'-bipyridine)的机理解释Pd(CH(3))(CH(3)CN)](+)[BArF](-)(1b)(BArF = 3,5-(CF(3))(2)-C(6)H( 3))据报道,
苯乙烯与CO完美地交替共聚。已发现在CH(2)Cl(2)或
氯苯中的共聚反应在
苯乙烯中是一阶的,而在CO浓度中是相反的一阶的。已经通过低温NMR技术研究了催化循环中的微观步骤。烷基
钯螯合物[[(
2,2'-联吡啶)Pd(CHArCH(2)C(O)CH(3)](+)[BArF](-)(5b sigma)和[(
2,2'-联吡啶制备了平衡存在的Pd(eta(3)-CH(CH(2)C(O)CH(3))Ar)] +(BArF](-)(5b pi)。西格玛 在-78℃下用pi(13)CO,然后用
4-叔丁基苯乙烯,使(13)C