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Zn(bipy)3Cl2, Fe(bipy)Cl3, and Fe(tpp)Cl are effective catalysts for silylation of hydroxy groups with HMDS at room temperature in dry CH3CN. High selectivity is observed between primary and secondary hydroxy functional groups. This method absolutely discriminates other functional groups containing labile hydrogen atoms.
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Firouzabadi et al. (1997) studied this question.
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