SUBSTITUTED PYRIDAZINES,PROCESSES FOR MAKING THEM,THEIR USE AS PLANT GROWTH REGULATORS,AND PLANT GROWTH REGULATING COMPOSITIONS CONTAINING THEM

摘要

Novel substituted pyridazines are provided which exhibit plant growth regulating activity on gramineous plants such as cereals. The novel compounds are of Formula (I) below: wherein R<1> is (C1-C4) alkyl, phenyl or naphthyl each of the last two groups being optionally substituted with up to three of the same or different substituents selected from halogen, trihalomethyl, (C1-C4) alkoxy, (C1-C4) alkyl and cyano; R<3> is a group as defined below for R<5>; R<5> is a carboxy (-COOH) group or agronomically acceptable alkali metal salt thereof, an alkoxycarbonyl (-COOR) group or a substituted carbamoyl (-CONR min R sec ) group, wherein R represents (C1-C4) alkyl, R min represents hydrogen or (C1-C4) alkyl and R sec represents (C1-C4) alkyl; and R<6> is a (C1-C4) alkyl group or an optionally substituted phenyl or naphthyl group as defined for R<1> above. Also provided are agronomically acceptable acid addition salts of compounds of Formula (I).