ISOLATION OF ACYCLIC PRECURSORS OF THE MARMELO OXIDES, THE MARMELO LACTONES AND THE QUINCE OXEPINE FROM QUINCE FRUIT (CYDONIA-OBLONGA MIL)

(2E,4E)-2,7-Dimethyloctadiene-1,8-diol (5), (2E,4E,7Z)-2,7-dimethyldecatriene-1,10-diol (6) and (4E,6E)-2,7-dimethyl-8-hydroxyoctadienoic acid (7), three acyclic precursors of the marmelo oxides (1), of the marmelo lactones (2) and of quince oxepine (3) respectively, as well as three acyclic C-10 compounds ((3E)-2,7-dimethyloctene-1,8-diol (4), (2E,4E)-2,7-dimethyl-8-hydroxyoctadienoic acid (8) and (2E,4E)-2,7-dimethyloctadienedioic acid (9)) were isolated from the glycosidic fraction of quince fruit (Cydonia oblonga Mil.).