Dihydropyridazinones and pyridazinones and their use as fungicides and insecticides

A dihydropyridazinone and pyridazinone compound having the structure ##STR15## wherein W is CH.sub.3 --O-A.dbd.C--CO(V)CH.sub.3 ;

• A is N or CH;
• V is O or NH;
• wherein
• Y is O, S, NR.sub.1, or R.sub.6, the ring bond containing R.sub.4 and R.sub.5 is a single or double bond;
• n is 0 or 1;
• X is independently selected from hydrogen, halo, (C.sub.1 -C.sub.4)alkyl, (C.sub.1 -C.sub.4) alkoxy
• and
• --HC.dbd.CH--CH.dbd.CH-- thereby forming a napthyl ring;
• R.sub.2 is independently selected from hydrogen, (C.sub.1 -C.sub.12)alkyl, (C.sub.1 -C.sub.12)alkoxy, halo(C.sub.1 -C.sub.12)alkyl, halo(C.sub.1 -C.sub.12)alkoxy, hydroxy(C.sub.1 -C.sub.12)alkyl, (C.sub.1 -C.sub.12)alkoxy(C.sub.1 -C.sub.12)alkyl, (C.sub.1 -C.sub.12)alkoxycarbonyl(C.sub.1 -C.sub.12)alkyl, (C.sub.2 -C.sub.8)alkenyl, halo(C.sub.2 -C.sub.8)alkenyl, (C.sub.3 -C.sub.10)alkynyl, halo(C.sub.3 -C.sub.10)alkynyl, (C.sub.3 -C.sub.7)cycloalkyl, (C.sub.3 -C.sub.7)cycloalkyl(C.sub.1 -C.sub.4)alkyl, epoxy(C.sub.1 -C.sub.12)alkyl, PO(OR.sub.1).sub.2 (C.sub.1 -C.sub.12)alkyl, R.sub.1 S(O).sub.2 (C.sub.1 -C.sub.12)alkyl, (R.sub.1).sub.3 Si(C.sub.1 -C.sub.12)alkyl, aryl, aryloxy(C.sub.1 -C.sub.12)alkyl, arylcarbonyl(C.sub.1 -C.sub.12)alkyl, aralkyl, arylalkenyl, heterocyclic, heterocyclic (C.sub.1 -C.sub.12)alkyl, N-morpholino(C.sub.1 -C.sub.12)alkyl, N-piperidinyl(C.sub.1 -C.sub.12)alkyl;
• R.sub.1 is independently selected from (C.sub.1 -C.sub.12)alkyl, (C.sub.2 -C.sub.8)alkenyl and aryl;
• R.sub.4, and R.sub.5 are independently selected from hydrogen, halo, (C.sub.1 -C.sub.8)alkyl, (C.sub.1 -C.sub.8)alkoxy, cyano, halo(C.sub.1 -C.sub.12)alkyl, (C.sub.2 -C.sub.8)alkenyl, (C.sub.3 -C.sub.10)alkynyl, aryl and aralkyl;
• and R.sub.6 is (C.sub.1 -C.sub.12) alkylenyl and (C.sub.2 -C.sub.12)alkenylenyl;
• wherein the foregoing aryl moieties are phenyl or naphthyl, unsubstituted or further substituted with up to three substituents selected from the group consisting of halogen, cyano, nitro, trihalomethyl, phenyl, phenoxy(C.sub.1 -C.sub.4)alkyl, (C.sub.1 -C.sub.4)alkylthio, (C.sub.1 -C.sub.4)alkylsulfoxide, (C.sub.1 -C.sub.6)alkoxy and halo(C.sub.1 -C.sub.4)alkyl;
• aralkyl is defined as aryl (C.sub.1 -C.sub.10)alkyl wherein aryl is defined above;
• heterocyclic moieties are defined as unsubstituted 2-,3- or 4-pyridinyl, pyrazinyl, 2-,4-, or 5-pyrimidinyl, pyridazinyl, triazolyl, imidazolyl, 2- or 3-thienyl, 2- or 3-furyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, oxadiazolyl, thiadiazolyl, quinolyl and isoquinolyl or substituted with up to two substituents independently selected from (C.sub.1 -C.sub.2)alkyl, halogen, cyano, nitro and trichloromethyl.