Irradiation of 3-(3-butenyloxy)- and 3-(4-pentenyloxy)-5, 5-dimethyl-2-cyclohexen-1-ones resulted in an intramolecular cycloaddition to give the corresponding 2-oxabicyclo-[n.2.0] alkanes rather than the 2-oxabicyclo [n.1.1] alkanes. Similarly 3-(N-acetyl-N-3-butenylamino)- and 3-(N-acetyl-N-4-pentenylamino)-5, 5-dimethyl-2-cyclohexen-1-ones afforded the 2-azabicyclo [n.2.0] alkanes. Some of the ring opening reactions of these photoadducts are also described.
3-(3-
丁烯氧基)-和3-(4-
戊烯氧基)-5, 5-二甲基-
2-环己烯-1-酮的辐照导致分子内环加成,得到相应的2-氧杂双环-[n.2.0]
烷烃而不是 2-氧杂双环 [n.1.1]
烷烃。类似地,3-(N-乙酰基-N-3-
丁烯基
氨基)-和3-(N-乙酰基-N-4-
戊烯基
氨基)-5,5-二甲基-
2-环己烯-1-酮得到
2-氮杂双环[n .2.0]
烷烃。还描述了这些光加合物的一些开环反应。