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NaBrO3 combined with NaHSO3 was found to be an efficent reagent for the oxidative esterification of primary alcohols. Thus, a variety of esters was prepared from primary alcohols, aldehydes, and acetals in aqueous medium under mild conditions. Treatment of α,ω-diols with NaBrO3/NaHSO3 reagent afforded the corresponding lactones and/or dicarboxylic acids in fair yields.

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Oxidative Esterification of Primary Alcohols by NaBrO3/NaHSO3 Reagent in Aqueous Medium.-NaBrO3/NaHSO3-reagent is found to be an efficient oxidizing agent of primary alcohols such as (I) to esters like (II) and acids, e.g. (III), under mild conditions. Treatment of α,ω-diols, e.g. (IV) and (VI), with this reagent affords dicarboxylic acids such as (V) or lactones such as (VII). -(TAKASE, K.; MASUDA, H.; KAI, O.; NISHIYAMA, Y.; SAKAGUCHI, S.; ISHII, Y.; Chem. Lett. (1995) 10, 871-872; Dep. Appl.

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