Acetolysis of 2-(2,3-dihydro-1H-cyclopenta[l]phenanthren-2-yl)ethyl derivatives: participation by the 9,10-bond of phenanthrene to give an analogue of a classical norbornyl cation
作者:R. M. Cooper、M. C. Grossel、M. J. Perkins
DOI:10.1039/p29720000594
日期:——
Kinetic and product studies of the title reaction indicate participation by the 9,10-bond of the phenanthrene ring. Preparative acetolysis of the bromide (5d) catalysed by silver acetate, gives 3,4-dihydro-2H-2,4a-methanotriphenylene (8) as a major product. This dissolves in fluorosulphonic acid to give a red solution, the 1H n.m.r. and electronic absorption spectra of which are consistent with the
标题反应的动力学和产物研究表明,菲环参与了9,10键。通过乙酸银催化的溴化物(5d)的制备性乙酰水解,得到3,4-二氢-2 H -2,4a-甲基三苯并(8)为主要产物。溶于氟磺酸,得到红色溶液,其1 H nmr和电子吸收光谱与经典降冰片烷基阳离子(2A)的存在一致。乙酸对阳离子的亲核捕获主要发生在桥碳原子上,并伴随着开环再生环戊苯并菲乙基骨架。