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【Abstract】o-Bromomethylbenzylidenemalononitrile 4 is reduced by 1-benzyl-1,4-dihydronicotinamide (BNAH, 1) to give 2,2-indanedicarbonitrile 6 and p-bromomethylbenzylidene malononitrile 5 is reduced by BNAH to give 7 and 8 by hydride transfer mechanism.