Studies on Constituents of Medicinal Plants. X. The Nuclear Magnetic Resonance (NMR) Spectra of Dihydropaulownin and Dihydrosesamin and a Revised Structure for Isopaulownin

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1) Dihydropaulownin (VI) C20H20O7, mp 125°, dihydropaulownin acetate (VII) C22H22O8, mp 105-106°, dihydrosesamin (II) C20H20O6, mp 98-99° and dihydrosesamin acetate (III) C22H22O7, mp 91-93° were prepared. 2) The NMR spectra of II, III, VI and VII were studied. 3) The Mass spectra of VIII and XI were studied. 4) The structure of isopaulownin was revised as X.

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