Abstract: Preparation of cyclopropane carboxylic acids usable as intermediates and of formula (II), wherein R1 represents halogen, preferably Cl or Br, or haloalkyl, preferably CF3, and X2 represents halogen, preferably Cl or Br, where R1 or X2 may be the same or different, and wherein the configuration of (II) is predominantly Z for R1=CF3 and X2=Cl; by reacting, in the presence of a catalyst, a compound of formula (I), wherein R1 and X2 are as defined, and X1 represents halogen, preferably Cl or Br, where R1, X1 and X2 may be the same or different, with a compound which is a hydrogen donor.

Abstract: The compounds 3-(2,2-dichloro-3,3,3-trifluoro-1-hydroxypropyl)-2,2-dimethyl-(1R,cis)-cyc lopropane carboxylic acid, cis-3-(2,2-dichloro-3,3,3-trifluoro-1-hydroxypropyl)-2,2-dimethyl-cyclopro pane carboxylic acid and (1R,5S)-4-(1,1-dichloro-2,2,2-trifluoroethyl)-6,6-dimethyl-3-oxabicyclo[3. 1.0]hexan-2-one occur as intermediates in a process for the preparation of insecticidally active cyclopropane carboxylate esters, said process starting from 6,6-dimethyl-4-hydroxy-3-oxabicyclo[3.1.0]hexan-2-one (Biocartol) which is reacted with the compound CF.sub.3 --CC1X.sub.2 (X=halogen) in the presence of zinc.

Abstract: This invention is concerned with certain terpenoid compounds of substituted hydroxy-alkylpyridines, and their preparation and use. These compounds possess improved juvenile hormonal activity which can be utilized first and foremost to inhibit the metamorphosis of insect larvae and to act as sterilizing or ovicidal agent and, consequently, can be utilized in the control of insects.