Photoexcited 1‐naphthalenecarbonitrile (1) adds 2‐morpholinoacrylonitrile (2) in the [2 + 2] mode both at the C(1) – C(2) and C(7) – C(8) bond unidirectionally and with the formation of only one (3 and 4, respectively) of the two a priori possible stereoisomers in each case. The structure of 3 has been unambiguously confirmed by an X‐ray structural analysis.
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Düpp et al. (1993) studied this question.
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