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A wide range of aromatic nitro compounds can be reduced to anilines through the use of a Cr(II)/Mn(0) redox couple in the presence of trimethylsilyl chloride [TMSCl, Eq. (1)]. Only 0.25 equivalents of chromium are required to reduce solid-supported nitroarenes (R=solid support); this represents a rare case of transfer catalysis between two solid phases. The reaction is also amenable to solution-phase synthesis (R=OH).
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Hari et al. (1999) studied this question.
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