ISOLATION OF A GLUCOSIDIC BETA-DAMASCENONE PRECURSOR FROM ROSE PETALS

The 9-O-beta-D-glucopyranoside of 3-hydroxy-7,8-didehydro-beta-ionol ( 1) has been isolated from a glycosidic XAD-2 extract obtained from ros e petals. In addition to the beta-damascenone-generating compound 1, t he following glycoconjugates have been isolated and characterized as p eracetates: 3-hydroxy-7,8-dihydro-beta-ionol 9-O-beta-D-glucopyranosid e (2), 3-hydroxy-7,8-dihydro-beta-ionol 3-O-beta-D-glucopyranoside (3) , 2-phenylethyl-O-beta-D-glucopyranoside (4), 2-phenylethyl-O-beta-D-g alactopyranoside (5), benzyl-O-beta-D-glucopyranoside (6), -6-hydroxyo cta-2,7-dienyl-O-beta-D-glucopyranoside (7), (2Z)-2,6-dimethyl-6-hydro xyocta-2, 7-dienyl-O-beta-D-glucopyranoside (8), and hydroxyocta-2,6-d ien-8-yl-O-beta-D-glucopyranoside (9).