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PROCEDURE FOR THE PREPARATION OF 3,5,6-TRICHLORPYRIDINE-2-OL AND SALTS THEREOF AND INTERMEDIATES FOR USING THE PROCEDURE
PROCEDURE FOR THE PREPARATION OF 3,5,6-TRICHLORPYRIDINE-2-OL AND SALTS THEREOF AND INTERMEDIATES FOR USING THE PROCEDURE
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机译:3,5,6-三氯吡啶-2-醇的制备方法及其所用的盐和中间体
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摘要
Novel aryl and heteroaryl 4-cyano-2,2,4-trichlorobutyrates are prepared by reacting a corresponding aryl or heteroaryl trichloroacetate with acrylonitrile in the presence of a catalyst. Also provided is a novel process for producing 3,5,6-trichloropyridin-2-ol comprising cyclization of an aryl or heteroaryl 4-cyano-2,2,4-trichlorobutyrate in an inert organic solvent at elevated temperatures, in the presence of anhydrous hydrogen chloride.
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