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.
Claims26
A sulfentrazone composition comprising a crystalline polymorphic form of the compound N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamide (sulfentrazone) wherein the crystalline polymorphic form (sulfentrazone-1) has a melting range of from about 119° C. to about 130° C. as determined by differential scanning calorimetry (DSC).
A process for preparing sulfentrazone-1 comprising the steps of:
- (i) obtaining a solution comprising sulfentrazone in a polar, protic solvent selected from the group consisting of C1-4 alcohols, water and combinations thereof;
- (ii) modifying conditions of solubility for sulfentrazone in the solvent to initiate crystallization of sulfentrazone-1 from the solution.
A sulfentrazone composition comprising an herbicidally effective amount of sulfentrazone-1 in admixture with a suitable carrier.
Dependencies are inferred from the claim text.