TAJIK et al.
1284
8. Roche, D., Prasad, K., Repic, O., and Blacklock, T.J.,
added to a mixture of 0.143 g (1.2 mmol) of KBr and
0.72 g of poly(4-vinylpyridine)-supported peroxodi-
sulfate (equivalent to 1.2 mmol of peroxodisulfate) in
5 ml of acetonitrile, and the mixture was stirred on
heating under reflux for a time indicated in table. The
progress of the reaction was monitored by TLC
(carbon tetrachloride–diethyl ether, 4:2, or carbon
tetrachloride–n-hexane, 8:2). When the reaction was
complete, the mixture was cooled to room temperature
and filtered. Excess bromine was removed from the
filtrate by dropwise adding a 1 M sodium sulfite solu-
tion. Methylene chloride, 5 ml, was added, and the
organic layer was separated in a separatory funnel.
After drying over magnesium sulfate and evaporation
of the solvent, the crude product was purified by
recrystallization or column chromatography on silica
gel. The yields are given in table.
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The authors are thankful to the Guilan University
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