Abstract
UV excitation (λ ≥ 280 nm) of 1-acetonaphthones additionally substituted at C-2 or C-4 in the presence of 2-piperidinopropenenitrile resulted in the occurrence of two types of reactions, photocycloaddition and photosubstitution. Whereas photosubstitution has occurred only in the case of halogen substituents, the formation of [4 + 2]- and [2 + 2]-cycloadducts has been observed, which is dependent on the location of an additional substituent on the ring.
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