| abstract |
The invention relates to a process for the preparation of (+) - trans-cyclopropanecarboxylic acids or their salts of the general formula (I) in which ((+) - trans) R represents halogen or C 1 -C 4 alkyl and R 1 represents hydrogen or the equivalent of a metal ion, n n n and wherein the steric ratios are not reproduced in formula (I), which is characterized in that the (±) · transcyclopropanecarboxylic acid esters of the general formula (II), optionally in a mixture with the corresponding (±) -ciscyclopropanecarboxylic acid esters of the general formula (II ) ((±)) - trans or a mixture of (±) · trans and (±) -cis) in which R has the meaning given in the general formula (I) and R 7 represents methyl or ethyl, and n n n the steric relationships are not shown in formula (11),n n n Treated with hydrolases of microbial origin, which are extracellularly or cellularly optionally immobilized, and the (+) - trans-cyclopropanecarboxylic acids or their salts of the general formula (I) isolated and, if appropriate, purified and, if appropriate, the salts are prepared,n n n and the microorganisms suitable for this process. |