SOLID-STATE PHOTOADDITION REACTIONS IN POLYCRYSTALLINE MIXTURES OF NHHETEROAROMATIC-COMPOUNDS AND TRANS-STILBENE

Photoaddition reactions of indole (la), carbazole (Ib) and phenothiazi ne (Ic) to trans-stilbene (2) occurred in the mixed crystal state to g ive the corresponding adducts 3a, 3b and 3C with an N-C bond. Photoadd uct 4a with a C-C bond was also obtained by the solid state photoreact ion of la with 2. The mixed crystals prepared by the melting and resol idifying method were simple polycrystalline mixtures of the two compon ents, and the photoreactions proceeded at the interface of the two cry stallites. The selectivity of the photoaddition reaction was higher in the solid state than in solution.