13BETA-ALKYLMILBEMYCIN DERIVATIVES FOR CONTROLLING PARASITES OF ANIMALS AND PLANTS

摘要

The invention relates to parasiticidally and insecticidally highly active compounds of formula I (I) wherein R is C1-C10alkyl; R1 is hydrogen, a silyl group or a sugar residue; and R2 is methyl, ethyl, isopropyl or sec-butyl, and to the preparation thereof starting from suitably substituted 15-ester or 13 beta -ester milbemycins.