Studies on the Constltuents of the Flavonoids from the Leaves of Typha angustifolia L.

Six flavonoids were isolated from the leaves of Typha angustifolia L. On the basis of spectroscopic (IR, UV, MS, 1HNMR and 13CNMR) analysis, they were identified as quercetin-3,3'-dimethyl ether (TF-Ⅰ), isorhamnetin (TF-Ⅱ), quercetin (TF-Ⅲ), quercetin-3,3' dimethyl ether-4'-O-β-D-glucoside (TF-Ⅳ), isorhamnetin-3-O-β-galactoside (TF-Ⅴ), and isorhamnetin-3-O-neohesperidoside (TF-Ⅵ). Compounds TF-Ⅰ and TF-Ⅴ were found in the genus of Typha for the first time.