The present invention relates to a process for the preparation of
trans-alkenoic acids of general formula CH.sub.3
--(CH.sub.2)n--CH.dbd.(CH.sub.2)mCO.sub.2 H where n=4 to 9 m=8 to 16. More
particularly, the present invention relates to a process for the
preparation of trans-tetracos-15-enoic acid, which is a bioactive
constituent possessing dose-related hepatoprotective activity. The present
invention also relates to the use thereof for hepatoprotection.