Heterocyclic systems containing tin(IV)—XIII [1]. Possible ceasing or inversion of the structuraltrans influence during the course of a bimolecular nucleophilic attack of a donor group in a series of SnIV rings
作者:Mike Beuter、Ute Kolb、Andrea Zickgraf、Elmar Bräu、Michael Bletz、Martin Dräger
DOI:10.1016/s0277-5387(97)00180-0
日期:1997.9
observed: shorter distances X/3.Sn and simultaneously shorter distances Sn R(trans). Also in a series of 8 compounds with O/3.Si (Hal) interaction, taken from the literature, the dominanttrans influence ceases to zero in the central part of the oxygen approach. Actually, the discussed ranges of inversion or ceasing of thetrans influence are small and in terms of e.s.d.s at the borderline of statistical
摘要在一系列杂环X [(CH2)3] 2SnR2(16种新合成的化合物,其中两种选自文献)和锗类似物BuiN [(CH2)3] 2GeCl2中,施主基团X(= NMe,NBz ,NBui,NPri,O,S)分子内攻击路易斯酸性原子Sn或Ge。比较了八个结构确定值(此外,还有两个来自文献)。配体R2 = Cl2对Sn的亲核攻击比负电性更大的R2 =(OSiPh3)2强。总的来说,熟悉的反式影响保持:X的同时接近和配体R的弱化(反式)。在三种情况下,供体强度略有下降,观察到轻微的倒转或停止:距离X / 3.Sn较短,同时距离Sn R(trans)较短。同样是从文献中获得的一系列8种具有O / 3.Si(Hal)相互作用的化合物,在氧气方法的中心部分,主要的反式影响不再为零。实际上,所讨论的反演影响或反演影响停止的范围很小,并且在esds方面处于统计显着性的边界。尽管有此反对意见,但仍然存在四个