2-alkynyl-6-pyridin-2-yl-pyridazinones, 2-alkynyl-6-pyridin-2-yl-dihydropyridazinones, 2-alkynyl-6-pyrimidin-2-yl-pyridazinones and 2-alkynyl-6-pyrimidin 2-yl-dihydropyridazinones and their use as fungicides

摘要

A compound of the formula ** ** Formula wherein A represents an N atom; ------ represents a single or a double bond; R1, R2 and R3 independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, an alkyl group C1-C6, an alkoxy group C1-C6, alkylthio group of C1-C6 haloalkyl group, C1-C6 alkyl, halo-C1-C6 alkyl, halo-C1-C6 alkyl, a phenyl group unsubstituted or substituted, or a phenoxy group unsubstituted or substituted; R4 represents a hydrogen atom, a halogen atom, a cyano group or an alkyl group C1-C6 alkyl; and R5 represents a halogen atom, an alkyl group C1-C8, an alkenyl group of C2-C8, an alkynyl group of C2-C8, alkoxy C1-C8 haloalkyl group, C1-C8, a group C2-C8 haloalkenyl, haloalkynyl group C2-C8 or halo-C1-C8.