Abstract: Pesticidal compounds have the formula: ##STR1## wherein D represents hydrogen or a cyano groupX represents chlorine or bromineA represents an alkyl groupn is 0 or an integer of 1-4 andRCOO is the residue of an acid RCOOH whose .alpha.-cyano-3-phenoxybenzyl ester has pesticidal properties. They are prepared by esterification methods.

Abstract: 3-Phenoxybenzyl 2,2-dimethyl-3-vinyl-cyclopropane carboxylates of the formula ##STR1## in which R, R.sup.1 and R.sup.2 each independently is hydrogen or halogen,R.sup.3 is phenyl, phenylthio, or phenyl or phenylthio carrying at least one alkyl group or halogen atom,Y is hydrogen or cyano,n is 1, 2, 3, 4 or 5, andm is 1, 2, 3 or 4,which possess arthropodicidal properties.

Abstract: Halovinylbenzyl esters of the formula I ##STR1## where R.sup.1 is ##STR2## R.sup.2 is H, CN, lower alkyl, lower alkenyl, lower alkynyl, lower haloalkyl or lower haloalkenyl, R.sup.3 is H, halogen or lower alkyl, R.sup.4 is H, lower alkyl, lower alkoxy or lower alkoxymethyl, R.sup.5 is lower alkyl, lower hal lk(en)yl or lower haloalkynyl, R.sup.6 and R.sup.7 are each lower alkyl or halogen, A is halogen, lower alkyl, lower alkoxy, lower haloalkyl, lower haloalkoxy, CN or NO.sub.2, m is 0 to 4, n is 1 to 3, B is lower alkyl, lower alkenyl, lower alkynyl or cycloalkyl, and X is H, halogen, lower haloalkyl, lower thioalkyl, lower alkoxy or lower alkyl, and halogen can be fluorine, chlorine or bromine and, in the case of R.sup.2, may furthermore be iodine, a process for their manufacture, and their use as pesticides.

Abstract: Novel cyclopropane carboxylates in all isomeric forms of the formula ##STR1## wherein A is selected from the group consisting of --O--, --S--, ##STR2## and --SO.sub.2 --, R.sub.1 is selected from the group consisting of optionally unsaturated alkyl of 1 to 18 carbon atoms optionally containing at least one heteroatom in the carbon chain and optionally substituted with at least one halogen, aryl of 6 to 18 carbon atoms and aralkyl of 7 to 18 carbon atoms and R.sub.2 is selected from the group consisting of hydrogen, optionally unsaturated alkyl of 1 to 12 carbon atoms, optionally unsaturated cycloalkyl of 3 to 12 carbon atoms and residue of other alcohols used in pyrethrinoids having pesticidal activity for combatting insects, acariens of vegetables and warm-blooded animals and nematodes and novel intermediates.

Abstract: There are described 3-phenoxy-benzyl or .alpha.-cyano-3-phenoxy-benzyl esters of 2,2-dimethyl-cyclopropanecarboxylic acids substituted in position 3 by a dienic polyhalogenated chain, as well as their use as insecticides and acaricides. Moreover, there are also described the intermediates for their preparation and processes for their preparation.

Abstract: Pesticidal compounds have the formula: ##STR1## wherein D represents hydrogen or a cyano or ethynyl group;B represents hydrogen or an alkyl or alkenyl group;A represents an alkyl group or a halogeno group or a CF.sub.3 group;n is 0 or an integer of 1-4; andRCOO is the residue of an acid RCOOH which is a 2,2-dimethyl-cyclopropane carboxylic acid carrying at the 3-position a dihalovinyl, an alkenyl or a carboalkoxyalkenyl group, provided that (1) when the group --CH.sub.2 CH.dbd.CHB is located at the 4-position on the ring with respect to the ester linkage, then D must be hydrogen and the group carried at the 3-position on the cyclopropane ring of the acid must be a dihalovinyl group and (2) when the group --CH.sub.2 CH.dbd.CHB is located at the 3-position on the ring and D is a CN group, then n must be 0.

Abstract: Stereoisomerically-enriched cyanomethyl esters are prepared by treating a non-symmetrical ketene with a racemic or optically-active alpha-hydroxynitrile in the absence of a catalyst or in the presence of an achiral tertiary amine catalyst.

Abstract: Pesticidally active 2,2-dimethyl-3-(2-halogeno-vinyl)-cyclopropanecarboxylic acid esters of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and represent alkyl or halogenoalkyl,R.sup.3 represents alkyl or the grouping --(CH.sub.2)--.sub.n R.sup.4,in whichn represent 0 or 1 andR.sup.4 represents halogenoalkyl, optionally substituted aryl or the grouping --XR.sup.5,in whichX represents oxygen or sulphur andR.sup.5 represents alkyl, halogenoalkyl, optionally substituted aryl or optionally substituted aralkyl,Hal represents fluorine, chlorine or bromine andR represents an alcohol radical which can be used in the case of pyrethroids.Intermediates carrying an acid, acid chloride or alkyl ester group in place of --COOR are also new.