作者:Ichiro Moritani、Naoki Toshima、Shiro Nakagawa、Masatoshi Yakushiji
DOI:10.1246/bcsj.40.2129
日期:1967.9
Photoreactions of conjugated or non-conjugated, five-membered, cyclic ketones were investigated. Irradiation of 2,3,4,5-tetraphenyl-2-cyclopenten-1-one in 2-propanol with ultraviolet light under a slow stream of nitrogen or oxygen gave 1-oxo-2,3-diphenyl-2,3-dihydro-1H-cyclopenta[l]phenanthrene (55%) and 1-oxo-3-hydroxy-2,3-diphenyl-2,3-dihydro-1H-cyclopenta[l]phenanthrene (about 20%). Similar irradiation of 3,4-diphenyl-3-cyclopenten-1-one under a nitrogen stream gave 2-oxo- and 2-hydroxy-2,3-dihydro-1H-cyclopenta[l]phenanthrene in 33% and 11% yields respectively. In both cases, there was observed photocyclization of a cis-stilbene skeleton to a phenanthrene. However, on irradiation of 2,2-dimethyl-3,4-diphenyl-3-cyclopenten-1-one, there was obtained a decarbonylation product, 1,1-dimethyl-1,2-dihydrocyclobuta[l] phenanthrene. The reaction courses of these photoreactions are proposed.
研究了共轭或非共轭的五元环酮的光反应。在氮气或氧气缓慢流动下,用紫外光照射2,3,4,5-四苯基-2-环戊烯-1-酮在2-丙醇中的反应,得到了1-氧-2,3-二苯基-2,3-二氢-1H-环戊烯[1]苯并蒽(55%)和1-氧-3-羟基-2,3-二苯基-2,3-二氢-1H-环戊烯[1]苯并蒽(约20%)。在氮气流下,类似地照射3,4-二苯基-3-环戊烯-1-酮得到了2-氧和2-羟基-2,3-二氢-1H-环戊烯[1]苯并蒽,产率分别为33%和11%。在这两种情况下,都观察到顺式stilbene骨架光环化为苯并蒽。然而,在照射2,2-二甲基-3,4-二苯基-3-环戊烯-1-酮时,得到了一个脱羰基产物,即1,1-二甲基-1,2-二氢环丁烯[1]苯并蒽。提出了这些光反应的反应过程。