Occurrence in Seed Oils of Some Fatty Acids With Conjugated Unsaturation

The following fatty acids were identified in the respective seed oils; α-eleostearic in Kentranthus macrosiphon; trans-8,trans-10,cis-12-octadecatrienoic in Osteospermum hyoseroides; 9-hydroxy-10,12- and 13-hydroxy-9,11-octadecadienoic in Tagetes erecta. Dimorphecolic acid was obtained from Osteospermum ecklonis in pure crystalline form. It gave 9-D-hydroxystearic acid on hydrogenation, thus establishing the D-configuration of the parent acid. Dehydration of dimorphecolic acid gave a mixture of all-trans-8,10,12- and all-trans-9,11,13-octadecatrienoic acids.