Abstract: Hydrazinecarboxamides and carbothioamides of the formula ##STR1## wherein R.sub.1 is selected from alkyl, cyanoalkyl, hydroxyalkyl, and benzyl, R.sub.2 is hydrogen or alkyl, Y is oxygen or sulfur, n is 0-5, and Z is substituted for hydrogen and independently selected from halogen, alkyl, alkoxy, phenoxy, trifluoromethyl, and nitro are useful as nematicides when applied to or incorporated into nematode-infested soil.

Abstract: Oxime ethers of the formula ##STR1## wherein R.sup.1 is isopropyl, cyclopropyl, cyclopropylmethyl, or cyclobutyl; X and Y are independently halogen or straight or branched chain alkyl or alkoxy of 1 to 4 carbon atoms optionally substituted with one or more halogen atoms; n is 0-2; and m is 1-4 are disclosed. The insecticidal efficacy and preparation of the compounds are described and exemplified.

Abstract: Compounds of formulae II, III and IV: ##STR1## are useful intermediates for preparation of an insecticidal compound of formula (I) ##STR2## in which R.sub.a and R.sub.b are independently hydrogen, halogen, or alkyl. The intermediate II is prepared by reacting 3,3-dimethyl-4-pentenoic acid, a salt thereof, a lower alkyl ester or an acid chloride thereof with a compound of the formula ##STR3## in which X is hydroxy or a good leaving group. Intermediate III is prepared by reacting II with 1,1,1-trichloro-2,2,2-trifluoroethane in the presence of a solvent and catalyst. Intermediate III is then dehydrohalogenated in the presence of base to remove 2 moles of halogen halide per mole of III in one or two steps to produce I.

Abstract: Compounds of formulae II, III and IV: ##STR1## are useful intermediates for preparation of an insecticidal compound of formula (I): ##STR2## The intermediate II is prepared by reacting the acid halide, alkali metal salt, or lower alkyl ester of 3,3-dimethyl-4-pentenoic acid with a compound of the formula ##STR3## in which X is a hydroxy group or a leaving group. Intermediate III is prepared by reacting II with 1,1,1-trichloro-2,2,2-trifluoroethane in the presence of a solvent, a solvating agent, and a catalyst. Intermediate III is then di-dehydrochlorinated in the presence of base, in one or two steps, to produce I.