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Reduction of triphenylmethanol (Ph3COH) to triphenylmethane by an NADH model compound, 9,10-dihydro-10-methylacridine (AcrH2), proceeds very efficiently in the presence of perchloric acid (HClO4) in acetonitrile at 298 K via hydride transfer from AcrH2 to triphenylmethyl cation (Ph3C+) which is formed by the dehydration of Ph3COH with HClO4. Mechanisms of hydride transfer reactions from NADH model compounds to Ph3C+ are also discussed.
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Ishikawa et al. (1989) studied this question.
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