Process for the preparation of sulfentrazone
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Apr 30, 1999
filing date -
May 29, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a process for the preparation of N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamide (I) which comprises reacting 2-(5-amino-2,4-dichlorophenyl)-4-(difluoromethyl)-2,4-dihydro-5-methyl-3H-1,2,4-triazol-3-one (II) with methanesulfonyl chloride in the presence of a catalytic amount of a source of soluble halide.
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