H. Koshima et al., SOLID-STATE PHOTOADDITION REACTIONS IN POLYCRYSTALLINE MIXTURES OF NHHETEROAROMATIC-COMPOUNDS AND TRANS-STILBENE, Journal of photochemistry and photobiology. A, Chemistry, 85(3), 1995, pp. 225-229
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.