Product (191) in turn undergoes secondary photoreactions involving the known redox chemistry of this compound, and leading to amino and nitrosobenzoic acid, the corresponding azoxy derivative, as well as to aminobenzaldehyde. 188-190

Further aromatic derivatives for which photolability has been reported include the antihepatitis drug catechin (cyanidol, 192). This is photoreactive both in solution and in the solid state, in the latter case to a different degree for the different crystalline forms.191' 192 The topic antibacterial hexachlorophene (193) is dechlorinated when irradiated in degassed ethanol, the faster reaction involving the chlorine atoms ortho or para to the hydroxy groups.193 Likewise, tetrachlorosalicylanilide(194) is photodechlorinated preferentially from the position ortho to the phenolic function.194

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