Process for the preparation of chloropyridine sulphonic acid chlorides
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United States of America Patent
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Oct 30, 2001
Grant Date -
N/A
app pub date -
Apr 20, 2000
filing date -
Apr 21, 1999
priority date (Note) -
Expired
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Abstract
A process is disclosed for preparing chlorinated pyridinesulphonic acid chlorides of the general formula I ##STR1## from hydroxypyridine-sulphonic acids of the general formula II ##STR2## The process generally entails a) passing chlorine gas into a mixture of a hydroxypyridine-sulphonic acid and of phosphorus trichloride; b) heating the mixture of a) to temperatures of about 100 to about 120.degree. C.; c) removing any phosphorus oxychloride formed and any excess phosphorus trichloride by distillation; d) taking up the residue with an organic solvent; and e) distilling the liquid phase in a vacuum, thereby obtaining the chlorinated pyridine-sulphonic acid chloride.
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