Production of pyridine-3-sulfonic acid
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United States of America Patent
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Jan 21, 1992
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N/A
app pub date -
Oct 31, 1990
filing date -
Nov 17, 1989
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Expired
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Abstract
A method for the production of heavy metal-free pyridine -3-sulfonic acid by oxidation of 3-chloro-pyridine to 3-chloro-pyridine-N-oxide, substitution of the chlorine through a sulfonic acid group, and subsequent reduction to pyridine-3-sulfonic acid. The method can be carried out using raw 3-chloropyridine-N-oxide and direct further reaction of the pyridine-3-sulfonic acid-N-oxide in the presence of Raney nickel in an alkaline solution.
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