A new proanthocyanidin from the stem bark of Myrica nagi thumb.

Abstract

From the acetone extract of the stem-bark of Myrica nagi a new proanthocyanidin has been isolated. O boiling with alcoholic hydrochloric acid it gave delphinidin chloride and (+)-catechin and other complex products. The methyl ether does not consume periodic acid under conditions in which synthetic leucocyanidin methyl ether consumes one mole. From this and the analytical and spectral data (IR, NMR and mass spectra) it is concluded that in the ne proanthocyanidin the 4-position of the flavan-3,4-diol is involved in the C-C linkage with the 8-position of the catechin part.