PROCESS FOR PRODUCING S541-ANTIBIOTICA AND VETERINARY COMPOSITIONS CONTAINING THEM AS ACTIVE COMPONENTS, AND COMPOSITIONS AGAINST PARASITES OF PLANTS CONTAINING THEM AS ACTIVE COMPONENTS

摘要

There are described potent parasiticidal and insecticidal active substances of the formula I IMAGE in which R represents C1-C10-alkyl; R1 represents hydrogen, a methyl, acyl or silyl group;R2 is methyl, ethyl or isopropyl; and R3 denotes hydrogen or an OH group; where, when R3 is hydrogen, there exists a 22,23-double bond or single bond and, where R3 denotes an OH group, there exists a 22,23-single bond, and the preparation of these active substances starting from the correspondingly substituted 15-esters or 13 beta -esters of S541-antibiotics.