COMPOUNDS CONTAINING AS ACTIVE SUBSTANCE HINDERING POLLEN FORMATION DERIVATIVES OF PIRASOLE AND PROCESS FOR PRODUCTION OF THE ACTIVE SUBSTANCE

摘要

Pollen formation in cereal grain plants is inhibited by application of a 4,5-dicarboxy or 5-carboxamido-4-carboxy (or derivatized carboxy)-1-(3,5-disubstituted-phenyl)pyrazole. CHEM Use of the compounds facilitates the production of hybrid seed. wherein R and R1 independently represent chloro, bromo or C1-C4 alkyl, R2 is hydroxy, C1-C4 alkoxy, C3-C4 alkenyloxy, C3-C4 alkynyloxy, or a phytologically-acceptable moiety forming a salt of the carboxylic acid; or R2 and R3 taken together represent -NH- so as to form an imide; R3 is NH2, hydroxy, or a phytologically-acceptable moiety forming a salt of the carboxylic acid; provided that R3 is NH2 when R2 is alkoxy, alkenyloxy or alkynyloxy and that R2 and R3 are the same when R3 is other than NH2.