THE CONSTITUENTS OF TAXILLUS-KAEMPFERI AN D THE HOST, PINUS-THUNBERGII .1. CATECHINS AND FLAVONES OF TAXILLUS-KAEMPFERI

Four flavonoid compouds, avicularin (1), hyperin (2), quercitrin (3), taxillusin (4), were isolated from leaves of Taxillus kaempferi, and t hree catechin compouds, (+)-catechin (6), procyanidin B-1 (7), procyan idin B-3 (8), showing a reddish purple color on the reaction with Ehrl ich reagent, were also isolated from the stems. Each of these seven is olated compounds was identified by comparing the spectral data with th ose of the references. Compound 8 was examined to substantiate the ste reochemical configurations of conformer, a and b in the detailed H-1-n uclear magnetic resonance (H-1-NMR) spectrum using the nuclear Overhau ser effect (NOE) difference spectroscopy and spin decoupling experimen t in the acetone-d(6) solution.