Process for the synthesis of 1,4-disubstituted pyrazoles
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United States of America Patent
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Mar 2, 1993
Grant Date -
N/A
app pub date -
Jul 20, 1992
filing date -
Jul 24, 1991
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for the synthesis of 1,4-disubstituted pyrazoles. A monosubstituted hydrazine is reacted with the product of reaction of an acetal with an N-substituted halomethyliminium salt, preferably N,N-dimethylchloromethyliminium chloride. The 1,4-disubstituted pyrazoles are, in particular, important intermediates in the synthesis of herbicides or drugs.
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