FIELD: organic chemistry. SUBSTANCE: described are new compounds of formula I: CF3-CXCI-CH(OH)CH2-C(CH3)2-CH2-CO2R wherein X is chlorine or bromine, and R is hydrogen or alkyl containing up to 4 carbon atoms, methods of preparation thereof and use thereof as intermediate products for preparation of cyclopropane derivatives with insecticidal properties. Also described are intermediate products for preparation of compounds of formula I. EFFECT: more efficient preparation method. 15 cl, 8 ex
