(-)-(S,S)-12-hydroxy-13-octadec-cis-9-enolide, a 14-membered lactone from Crepis conyzaefolia seed oil

Abstract

Crepis conyzaefolia (Gouan) Dalle Torre seed oil contains about 3% of (-)-(S,S)-12-hydroxy-13-octadec-cis-9-enolide (1), a lactone of (-)-threo-12,13-dihydroxyoleic acid. The absolute configuration of the acid has been established as D-12, L-13 (12-S, 13-S) and the lactone has the same absolute configuration. © 1977.