Crystallographic analysis of structural effects associated with symmetrical-1,3-bridging of five-membered rings by carbonyl spacers
作者:Changfu Xu、Jon Clardy、Richard V.C. Carr、Hermann Künzer、Koichi Nakamura、Leo A. Paquette
DOI:10.1016/s0040-4020(01)86829-0
日期:1987.1
significantly different angles adopted by the carbonyl groups of the central ring in each of these diketones were also accurately measured. In order to evaluate these relationships, a companion MM2-based computational study was undertaken simultaneously and relevant comparisons are made. The range covered by this triad of molecules provides Insight into structural factors that contribute to the preferred
三环[7.2.1.0 3,6 ]癸烷-2、8-二酮(4),其4,5-苯并稠合同系物(5)和四环[7.2.1.0 4,11 -.0 6,10已确定] -dodeca-2,7-二烯-5,12-二酮(6)。已经确定了这些分子中饱和和不饱和五元环所采用的构象。还精确地测量了每个二酮中中心环的羰基所采用的明显不同的角度。为了评估这些关系,同时进行了基于MM2的伴随计算研究,并进行了相关比较。该分子三元组所覆盖的范围提供了对有助于桥联二喹烷系统的优选基态构型的结构因素的深入了解。