Process for the preparation of 5-chloro and 5-bromo-2-hydroxynicotinic acids
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United States of America Patent
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Oct 2, 1990
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N/A
app pub date -
Nov 13, 1987
filing date -
Nov 26, 1985
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Expired
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Abstract
A process for the preparation of 5-halo-2-hydroxynicotinic acids having the formula: ##STR1## wherein X is chlorine or bromine, Y and Z are selected from hydrogen, loweralkyl or loweralkyl, is described wherein a corresponding 2-hydroxynicotinic acid is halogenated with alkali-metal hypohalite in a strongly alkaline solution pH 12 and above. Certain aspects of the isolation of the product are directed to avoiding replacement of the carboxy group with halogen.
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