Abstract: Novel 2,2-dimethyl-cyclopropane carboxylic acid derivatives of the formula ##STR1## wherein X.sub.1 and X.sub.2 are individually halogen, R.sub.1 is selected from the group consisting of halogen, alkyl of 1 to 8 carbon atoms, optionally substituted aryl of 6 to 14 carbon atoms, perfluoroalkyl of 1 to 8 carbon atoms, --CN and ##STR2## R' is alkyl of 1 to 8 carbon atoms, Y is selected from the group consisting of --SO.sub.2 Alk.sub.1, --SO.sub.2 Ar, ##STR3## Alk.sub.1 is optionally unsaturated alkyl of 1 to 8 carbon atoms optionally substituted with at least one halogen, Ar is aryl of 6 to 14 carbon atoms optionally substituted with at least one halogen Alk.sub.2 and Alk.sub.3 and Alk.sub.2 ' and Alk.sub.

Abstract: Novel 2,2-dimethyl-cyclopropane carboxylic acid derivatives of the formula ##STR1## wherein X.sub.1 and X.sub.2 are individually halogen, R.sub.1 is selected from the group consisting of halogen, alkyl of 1 to 8 carbon atoms, optionally substituted aryl of 6 to 14 carbon atoms, perfluoroalkyl of 1 to 8 carbon atoms, --CN and ##STR2## R' is alkyl of 1 to 8 carbon atoms, Y is selected from the group consisting of ##STR3## Alk.sub.1 is optionally unsaturated alkyl of 1 to 8 carbon atoms no substituted or substituted with at least one functional group, Ar is aryl of 6 to 14 carbon atoms no substituted or substituted with at least one functional group, Alk.sub.2 and Alk.sub.3 and Alk.sub.2 ' and Alk.sub.

Abstract: Novel cyclopropane carboxylic acid esters of all possible stereoisomeric forms and mixtures thereof of the formula ##STR1## wherein X is selected from the group consisting of hydrogen, fluorine, chlorine and bromine, R is selected from the group consisting of optionally unsaturated alkyl of 1 to 8 carbon atoms optionally substituted, optionally unsaturated cycloalkyl of 3 to 8 carbon atoms optionally substituted, optionally substituted aryl of 6 to 14 carbon atoms and optionally substituted heterocycle, Z is selected from the group consisting of hydrogen, --CH.sub.3, --CN and --C.tbd.CH and Y is selected from the group consisting of hydrogen, --OH, optionally unsaturated alkyl of 1 to 8 carbon atoms optionally substituted, --CN, --(CH.sub.2).sub.m --OAlk, --(CH.sub.2).sub.m --S--Alk, ##STR2## m is 0,1,2,3 or 4, Alk is alkyl of 1 to 12 carbon atoms, --Si(Alk').sub.3, Alk' is optionally unsaturated alkyl of 1 to 8 carbon atoms optionally substituted, --O--Ar and --(CH.sub.2).sub.

Abstract: Novel 2,2-dimethyl-cyclopropane carboxylic acid derivatives of the formula ##STR1## wherein X.sub.1 and X.sub.2 are individually halogen, R.sub.1 is selected from the group consisting of halogen, alkyl of 1 to 8 carbon atoms, optionally substituted aryl of 6 to 14 carbon atoms, perfluoroalkyl of 1 to 8 carbon atoms, --CN and ##STR2## R' is alkyl of 1 to 8 carbon atoms, Y is selected from the group consisting of --SO.sub.2 Alk.sub.1, --SO.sub.2 Ar, ##STR3## Alk.sub.1 is optionally unsaturated alkyl of 1 to 8 carbon atoms no substituted or substituted with at least one functional group, Ar is aryl of 6 to 14 carbon atoms no substituted or substituted with at least one functional group, Alk.sub.2 and Alk.sub.3 and Alk.sub.2 ' and Alk.sub.

Abstract: All possible stereoisomeric forms and mixtures thereof of a compound of the formula ##STR1## wherein A is selected from the group consisting of hydrogen, optionally unsaturated alkyl and haloalkyl of 1 to 18 carbon atoms, optionally substituted with aryl or a heterocyclic and optionally interrupted by --O-- or --S--, optionally unsaturated cycloalkyl of 3 to 18 carbon atoms, aryl of 6 to 14 carbon atoms and heterocyclic, B is selected from the group consisting of hydrogen, alkyl of 1 to 18 carbon atoms optionally interrupted by --S-- or --O-- and optionally substituted with at least one member of the group consisting of halogen, --OH, alkoxy of 1 to 8 carbon atoms, --SH, thioalkoxy of 1 to 8 carbon atoms, --NO.sub.2 and --CN and R is selected from the group consisting of optionally unsaturated alkyl of 1 to 18 carbon atoms and residue of an alcohol used in the synthesis of pyrethrinoid esters having pesticidal activity.

Abstract: Novel stereoisomers or mixtures of stereoisomers of compounds of the formula ##STR1## wherein R is the residue of an alcohol used in the pyrethrinoid field having remarkable pesticidal properties and being surprisingly stable.

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: All stereoisomeric forms and mixtures of stereoisomers of compounds of the formula ##STR1## wherein X is selected from the group consisting of oxygen, sulfur, sulfoxide and sulfone, R.sub.1 and R.sub.3 are individually selected from the group consisting of optionally unsaturated alkyl of 1 to 7 carbon atoms and optionally unsaturated cycloalkyl of 3 to 7 carbon atoms optionally substituted with at least one halogen and optionally interrupted with at least one heteroatom and aryl and aralkyl of 6 to 18 carbon atoms and R.sub.2 is the residue of a R.sub.2 OH alcohol used in pyrethrinoids synthesis having pesticidal activity and their preparation and novel intermediates.

Abstract: Novel 3-(1,2-propadienyl)-cyclopropane-carboxylates of the formula ##STR1## wherein R is alcohol used in pyrethrinoid synthesis, X and Y are both hydrogen or individually halogen or X is hydrogen or halogen and Y is alkyl of 1 to 18 carbon atoms or halogen or X is hydrogen or halogen or alkyl of 1 to 18 carbon atoms and Y is --COOR' or --CN or ##STR2## R' is alkyl of 1 to 18 carbon atoms, R.sub.2 and R.sub.3 are individually hydrogen or alkyl of 1 to 18 carbon atoms or R.sub.2 and R.sub.3 together with the nitrogen atom form a heterocycle having pesticidal properties.