[Phenylpropanoids constituents of Eucommia ulmoides leaves].

To investigate phenylpropanoids constituents from Eucommia ulmoides leaves.Various column chromatographic methods were used in isolation and purification. Physiochemical constant determination and spectral analysis were adopted to determine the chemical structures of phenylpropanoids.Nine phenylpropanoids were isolated and identified as caffeic acid (1), chlorogenic acid methylester (2), syringin (3), guaiacylglycerol (4), 5-methoxy-guaiacylglycerol (5), 5,9-dimethoxy-guaiacylglycerol (6), 9-n-butyl-guaiacylglycerol (7), 9-n-butyl-isoguaiacylglycerol (8), 8'-methoxy-olivil (9).Compounds 5 - 9 are isolated from this plant for the first time.