The photochemical reactions of 4-methoxy-1-naphthonitrile, 1, with 2,3
-dimethyl-2-butene, 2, (E)-3-ethoxyacrylonitrile, 3, 2-chloroacrylonit
rile, 4, and alpha-methylstyrene, 5, in ethyl acetate solution produce
d the corresponding [2+2] cyclobutane adducts 6-9, respectively. Addit
ion occurs at the 1,2-bond of naphthalene 1 with all of the ethenes in
vestigated.