The acetophenone-sensitized photolyses of benzoyl azide in cis-and trans-1,4-dimethylcyclohexanes gave the N-substituted benzamides stereospecifically. The photolyses in 2,3-dimethylbutane showed the same insertion regioselectivity ratio toward the C–H bonds as that of singlet benzoylnitrene in the direct photolysis. These facts indicate the existence of the singlet nitrene despite the triplet photosensitization and provide a chemical evidence for the establishment of a singlet-triplet equilibrium for benzoylnitrene.
在顺式和反式-
1,4-二甲基环己烷中,醋酰苯酮敏化的苯甲酰
叠氮光解产生了N取代的苯酰胺,并且具有立体选择性。在
2,3-二甲基丁烷中的光解显示出与在直接光解中单态苯甲酰氮烯对C–H键的插入区域选择性比率相同。这些事实表明尽管存在三重态光敏化,单态氮烯仍然存在,并为苯甲酰氮烯的单态-三重态平衡的建立提供了
化学证据。