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Polyethers with viologen moieties were prepared by the reaction of iodinated poly(ethylene glycol) (PEG) with 4,4'-bipyridine. These polymers were used as electron-transfer catalysts (ETC) for the reduction of diphenyl bromomethane (Ph 2 CHBr). Results disclosed that these polymers could induce the debromination of Ph 2 CHBr to afford tetraphenyl ethane effectively. An EPR method proved...
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