Liquid phase photobromination of biphenyl (50-600q yields 0-, m-, and p-bromobiphenyls, accompanying small amount of side-products, possibly adducts. The isomer distributions were measured by gas liquid chromatography. Unlike many heterolytic reactions, substitution at the meta-position takes place quite significantly. Tentative explanation for these fmdings are being communicated. Relative rates and partial rate factors for photobromination of biphenyl and bromo benzene were also derived. Results are discussed on the basis of the reactivity of biphenyl against the attacking bromine radicals. The validity of the competitive methods is also taken into consideration.
G H WILLIAMS ,M I BHANGER ,R BOLTON ,
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