Thermolysis and photolysis of 1-substituted triptycenes. Divergent fragmentation pathways of the triptycyl skeleton
作者:Hideo Tomioka、Junichi Nakajima
DOI:10.1039/p19960000563
日期:——
Generation of radical 7 in solution, however, did not result in a similar ring-opening reaction. Irradiation of compounds 1, on the other hand, afforded norcaradienes 3 almost exclusively, obviously as a result of di-π-methane rearrangement. No products resulting from a carbene species proposed to be involved in the di-π-methane reaction of triptycenes were detected. Thermolysis of compounds 3 gave not
在气相中在600°C / 10 –4 mmHg下热解1-苄基三苯并la不会引起任何明显的分解,但在苄基亚甲基(1b–d)上带有各种取代基(X)的化合物1的类似热解进行得很顺利。分解得到8-苄基苯[ a乙炔基2.解释了该反应的过程,是通过C-X键的均相溶解,然后在所得的苄基7中裂解三苯甲基基团,但是在溶液中生成自由基7并不会导致类似的开环反应。另一方面,辐照化合物1几乎仅提供了正二十碳三烯3,这显然是由于二π甲烷重排的结果。没有发现由提议与三联体的二-π-甲烷反应有关的卡宾物种产生的产物。化合物3的热分解不仅得到化合物2,而且还发现了苯并[ a ]乙炔4和苯并[ a ]茚并[1,2,3- cd ] azulene 5,其组成对取代基(X)和取代基X均敏感。热分解温度。