Substituted pyridazines, their use as plant growth regulators, and plant growth regulating compositions containing them.

摘要

The substituted pyridazines, which are novel compounds exhibiting plant growth regulatory activity, are compounds of Formula I below: <CHEM> wherein: R<1> is phenyl or naphthyl each optionally substituted with up to three of the same or different substituents selected from halogen, (C1-C4)alkyl, (C1-C4)alkoxy, alkoxy(C1-C4)carbonyl, trihalomethyl, nitro and cyano; Y is Z<1>R<3> or NR<7>R<8> wherein Z<1> is O or S; R<3> is hydrogen, (C1-C6)alkyl, hydroxy(C1-C6)alkyl, (C1-C4)alkoxy(C1-C4)alkyl, (C3-C6)cycloalkyl, (C3-C6)cycloalkyl(C1-C4)alkyl, halol(C1-C3)alkyl containing up to three halogens, phenyl or benzyl; and R<7> and R<8> (a) are the same or different and are selected from hydrogen, (C1-C4)alkyl, (C1-C4)alkyl substituted with a carboxyl group and (C1-C4)alkoxy substituted with a carboxyl group or (b) are joined together and form an alkylene group having up to 5 carbon atoms; Z is O or S; R<5> is (C1-C4)alkyl or phenyl(C1-C4)alkyl; and R<6> is (C1-C4)alkyl or phenyl(C1-C4)alkyl; and agronomically acceptable derivatives of compounds of Formula I being metal and ammonium salts, acid addition salts and quaternary ammonium addition salts.