Polymorphs of herbicidal sulfonamides
AssigneeFMC Corporation
InventorsPaul Nicholson, Karl Kauffman
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Abstract
Solid polymorphic forms of sulfentrazone are described. Particularly, a new polymorphic form of sulfentrazone is described herein as sulfentrazone-1, having surprising property advantages over technical sulfentrazone. Processes for the preparation of sulfentrazone-1, herbicidal compositions comprising sulfentrazone-1, and methods of its use are described.
Claims15
A sulfentrazone composition comprising a crystalline polymorphic form of N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamide (sulfentrazone-1), wherein the sulfentrazone 1 is obtained by a process comprising the steps:
- (i) obtaining a solution, suspension, or dispersion of technical grade sulfentrazone;
- (ii) crystallizing sulfentrazone-1 from the technical grade sulfentrazone from a polar, protic solvent;
- and (iii) isolating the crystallized sulfentrazone-1 to obtain the sulfentrazone composition, wherein the sulfentrazone-1 has a powder X-ray diffraction profile that comprises peaks in terms of 2-theta at 15.9±0.2°, 10.1±0.2°, 12.5±0.2°, 33.7±0.2°, and 37.7±0.2°, wherein at least 80 weight % of the sulfentrazone composition present is sulfentrazone-1, and wherein the composition is further characterized by comprising less than 2 weight % of an organic solvent.
Dependencies are inferred from the claim text.