Irradiation of 2-methyl- (1a), 2,2-dimethyl- (1b) and 2,3-diphenyl-2H-azirine (1c) in the presence of diethyl mesoxalate yields the corresponding 4-phenyl-5,5-diethoxycarbonyl-3- oxazolines 3a–c. Similar cycloadducts are observed (cf. 6) by irradiation of 1b and 1c in the presence of trifluoroacetophenone. When ethyl cyanoformate is used as trapping agent photolysis of 1b or 1c leads to cycloadducts
在甲基
草酸二乙酯存在下照射2-甲基-(1a),2,2-二甲基-(1b)和2,3
-二苯基-2 H-
叠氮基(1c)得到相应的4-苯基-5,5-二乙氧基羰基-3-
恶唑啉3a-c。在三
氟苯乙酮的存在下,通过辐射1b和1c观察到类似的环加合物(参见6)。当使用
氰基
甲酸酯
乙酯作为捕集剂时,1b或1c的光解会导致
氰基
甲酸酯中分别存在带有羰基和腈基的环加合物。