X-ray Crystal Structures and Conformational Analysis of Bicyclo[5.3.1]undec-1(11)-enes: Twisting versus Pyramidalization in Anti-Bredt Olefins
作者:Geerlig W. Wijsman、Guillermo A. Iglesias、Willem H. de Wolf、Marcus C. Beekman、Friedrich Bickelhaupt、Huub Kooijman、Anthony L. Spek
DOI:10.1021/jo0013195
日期:2001.2.1
The synthesis of several 9,11,11-trihalo[5.3.1]propellanes and their 4-dimethylsila analogues is described. They solvolyze under formation of the corresponding isomeric 7,9,11- trihalobicyclo[5.3.l]undec-1(11)-enes which are "anti-Bredt" olefins with a strained trans double bond in a bridged eight-membered ring; in the presence of nucleophiles such as water or ethanol, the corresponding 7-hydroxy or
描述了几种9,11,11-三卤代[5.3.1]丙炔及其4-二甲基硅氧烷类似物的合成。它们在相应的异构体7,9,11-三卤代双环[5.3.l] undec-1(11)-烯的形成下溶剂化,它们是在桥连的八元环中具有应变的反式双键的“反Bredt”烯烃。在亲核试剂如水或乙醇的存在下,分别获得相应的7-羟基或7-乙氧基衍生物。基于这些化合物中的四种(1a,9a,15、17b)的X射线晶体结构,讨论了应变和取代模式对双键扭曲和金字塔形程度的影响。