Laboratory synthesis demonstrates efficient formation of carboxylic esters using 1-methyl-2-halopyridinium salts, indicating a convenient route for ester preparation.
The equimolar reactions of carboxylic acids and alcohols with 1-methyl-2-halopyridinium salts in the presence of two equimolar amounts of tri-n-butylamine afforded the corresponding carboxylic esters in good yields.
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Mukaiyama et al. (1975) studied this question.
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