was isolated as a byproduct and structurally characterized, revealing an unprecedented structural arrangement. In combination with BEM, complexes 2a, 3a, and 4a were found to be efficient in isoprene polymerization to afford highly stereoregular trans-polyisoprene. Similar results were obtained by an "all in situ" approach starting from Nd(BH 4 ) 3 (thf) 3 /BEM mixtures in the presence of 2 equiv. of
在 2 当量的存在下,从等摩尔量的 Ln(BH 4 ) 3 (thf) 3 (Ln = Nd, Sm) 和正丁基乙基
镁 (B
EM) 开始,通过简单的方法合成了几种
硼氢化镧系元素。
环戊二烯衍
生物。根据
环戊二烯的性质,单
金属 Cp* 2 Nd(BH 4 )(thf) (Cp* = C 5 Me 5 ) (1)、异二
金属 [Cp 2 Nd(BH 4 )(μ-BH 4 )] 2 Mg(thf) 4 (Cp = C 5 H 5 ) (2), [(CMe 2 C 5 H 4 ) 2 Ln(BH 4 )(μ-BH 4 )] 2 Mg(thf) 3 (Ln = Nd, 3a;Ln = Sm, 3b) 和单
金属
苯胺基
环戊二烯基化合物 (C 5 Me 4 CH 2 SiMe 2 NPh)Ln(BH 4 )(thf) 2 (Ln = Nd, 4a; Ln = Sm, 4b)。通过 1 H NMR 光谱、元素分析和