Bayer Aktiengesellschaft

Haarmann & Reimer Gmbh

Alfred Korber

Kurt Bauer

Oskar Koch

Rudolf Hopp

Walter Kuhn

Roland Langner

Horst Finkelmeier

Detlef Hagena

Karl-Heinz Bork

Lactic acid menthyl ester can be stabilized by addition of alkali metal carbonate and/or bicarbonate and/or alkaline earth metal carbonate and/or bicarbonate.

Stabilized lactic acid menthyl ester

The invention relates to new derivatives of macrocyclic lactones, a process for their preparation, a pyrolysis process using these new derivatives and the use of the pyrolysis products for the preparation of saturated macrocyclic lactones.

Derivatives of cyclic lactones, a process for their preparation and a

The invention concerns new macrocyclic diesters of the general formula: ##STR1## wherein x is an integer from 8 to 11, which are valuable odorants and a process for their preparation.

Macrocyclic diesters

Process for the preparation of cyclopentadecanolide comprising the steps of converting 13-oxa-bicyclo [10.4.0]-hexadecene-[1(12)] to a lactone of the formula ##STR1## wherein X is an oxygen atom, .dbd.NOH or .dbd.N--NH.sub.2, reducing said lactone to give 15-hydroxy-pentadecanecarboxylic acid and cyclising said acid to give cyclopentadecanolide.

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Holzminden, Germany

Alfred Korber