Abstract: The present invention discloses compounds of the formula ##STR1## in which R is a 1,1-difluoroalkyl group or a 1,1-difluoroethenyl group having an even numbered carbon chain length of from 4 to 22 carbon atoms, pesticidal compositions thereof; and their use to control plant pests such as insects, acarids, and nematodes.

Abstract: S-trifluorobutenyl thiocarbonic acid esters of the formula ##STR1## and salts thereof, wherein X is R.sup.1 N or S and Y is RS or R.sup.3 R.sup.2 N;wherein R is a metal or a radical selected from alkyl, cycloalkylalkyl, halocycloalkylalkyl, alkenyl, haloalkyl, haloalkenyl, alkynyl, alkoxyalkyl, alkylthioalkyl, alkoxycarbonylalkyl, halophenoxyalkyl, trialkylsilylalkyl, (vinyl)dialkylsilylalkyl, (allyl)dialkylsilylalkyl, 2-chlorothiophene-5-ylmethyl, phenylalkyl, halophenylalkyl, nitrophenylalkyl, haloalkylphenylalkyl, dialkyl-2,3-dihydrobenzofuran-7-yl, [2-methyl-(1,1'-biphenyl)-3-yl]methyl, 3-phenoxybenzyl, phenylthioalkyl, halophenylthioalkyl, dialkylphosphoryl, dialkylthiophosphoryl, dialkylisoxazolylalkyl and thienylisoxazolylalkyl;wherein R.sup.1 is alkyl, cycloalkyl, cyano, dialkyl-2,3-dihydrobenzofuran-7-yl, halophenyl, halophenylalkyl, haloalkoxyphenyl, pyridinyl, halopyridinyl, alkyl-1,3,4-thiadiazolyl, haloalkyl-1,3,4-thiadiazolyl, benzothiazolyl, dialkyloxazolyl or thiazolinyl;wherein R.sup.

Abstract: Compounds of the formula ##STR1## their preparation, and use for the control of nematodes are disclosed and exemplified.

Abstract: A novel N,N,N-trimethyl-[1,1'-biphenyl]-2-methanaminium compound is subjected to a rearrangement reaction to give a 3-dimethylaminomethyl-2-methyl-[1,1'-biphenyl] compound which is then converted to the corresponding 3-halomethyl-2-methyl-[1,1'-biphenyl] compound. The halomethyl compound is an intermediate for pyrethroid and related insecticides having the alcohol moiety derived from a 2-methyl-[1,1'-biphenyl]-3-methanol.

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.