A series of polybrominated biphenyls (PBB) ranging from 2 to 8 atoms in bromine content was studied in regard to their ultraviolet properties and photochemical reactivity. The compounds containing bromine atoms in positions ortho to the biphenyl linkage were found to have greater ease of debromination in hexane and methanol solutions at wavelengths >290 nm. Debromination at the ortho positions was preferred in all cases. No substitution products were detected in methanol or water-acetonitrile solutions. The sensitizing effect of benzophenone and the slight quenching observed in air-saturated solutions suggest a triplet excited state intermediate.
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)