Photorearrangement of 2-cyanobicyclo[2.2.1]hept-2-ene. Observation of 1,2- and 1,3-sigmatropic shifts
作者:Ikbal A. Akhtar、John J. McCullough、Susan Vaitekunas、Romolo Faggiani、Colin J. L. Lock
DOI:10.1139/v82-226
日期:1982.7.1
the corresponding primary amine, which was converted to the p-bromobenzenesulfonamide 9, mp 150–151 °C, which gave single crystals from ethanol–water. The crystal and molecular structures are described. The minor product 6 was hydrogenated to give 7-cyanobicyclo[2.2. 1]heptane. Formation of 5 and 6 may involve concerted σ2s + π2s and σ2a + π2a processes respectively, which are photochemically allowed
2-氰基双环[2.2.1]庚-2-烯(2-氰基降冰片烯,4)在己烷中的辐照,在汞蒸气灯的全弧光下,得到重排产物1-氰基双环[4.1.0]庚-2 -烯5和7-氰基三环[4.1.0.03.7]庚烷6的比例为20:1。这些产品通过制备型 vpc 进行分离。通过单晶X射线分析确定主要产物5的结构。用氢化铝锂还原 5 得到相应的伯胺,将其转化为对溴苯磺酰胺 9,熔点 150-151 °C,从乙醇-水中得到单晶。描述了晶体和分子结构。次要产物6被氢化得到7-氰基双环[2.2。1]庚烷。5 和 6 的形成可能分别涉及协同的 σ2s + π2s 和 σ2a + π2a 过程,这是光化学允许的。