摘要
Walba等以其卓越的工作,合成了三-THYME(C_(42)H_(72)O_(18))和四-THYME(C_(56)H_(96)O_(24))圆筒及其Mbius扭曲环带分子,被誉为拓扑学进入有机化学领域的奇迹,成为迄今为止拓扑立体化学研究的重要内容,但从拓扑学的观点探索分子图拓扑结构特性尚缺乏深入研究,本文作者考虑到一般性,曾将扭曲数T为偶数(0,2,4)的定义为Hckel型。
The novel topology of the molecular cylinder and Mobius strip with three-rung and four-rung ladder is discussed. Some novel results in the low dimensional topology deriving from consideration of topological symmetry of the molecular graphs defined by the subject compounds are also discussed. The Hiickel-type molecules with the even number of twists and the Mobius-type molecule with the odd number of twists are defined. It is shown that for the Hiickel-type and Mobius-type molecules with vertices and edges of constitutionally equivalent or nonequiva-lent, the topological symmetry is topological invarants(homeomorphic), while T of the number of twist are not isotopic variable. The topological chirality of these molecules, which is an interesting problem, has been solved with the invention of the topological symmetry concept applied to molecular structures. In order to completely characterize a molecule it is useful to understand the symmetries of its molecular graph in 3-space. For this purpose the topological equivalent graph and topological symmetry are said to be rigid.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第11期1532-1534,共3页
Chemical Journal of Chinese Universities
基金
甘肃省自然科学基金
兰州大学重点基础理论项目资助
关键词
拓扑立体化学
拓扑手性
异构体
Topological stereochemistry, Topological stereoisomer, Topological chirality