Method for purification of 2-alkyl-4-halo-5-formylimidazoles
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United States of America Patent
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Mar 7, 1995
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N/A
app pub date -
Feb 16, 1994
filing date -
Feb 16, 1994
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Expired
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Abstract
The invention provides a method of purifying 2-alkyl-4-halo-5-formylimidazoles, which comprises dissolving an 2-alkyl-4-halo-5-formylimidazole in an aqueous solution of a sulfonating agent, adjusting the solution to pH 1-6, and removing the impurity 2-alkyl-4,5-dihaloimidazole by filtration or extraction.
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