The photocycloaddition reaction of 6-substituted phenanthridines and electron-rich olefins, such as trans-anethole and phenyl vinyl ether, is described. This reaction proceeds from the 1(π,π*) states of 6-substituted phenanthridines via the exciplex to give azocine and/or azetidine derivatives in ethanol.
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Futamura et al. (1982) studied this question.
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