Abstract
A colorless crystalline substance was isolated from the heart wood of Pseudotsuga japonica Shirasawa, and was proved to be identical with distylin (3.5.7.3'.4'-pentahydr oxyflavanone), which was formerly isolated by us from the heart wood of Larix leptolepis Gord.. Physical constants of this substance and its derivatives are as follows:
distylin m.p. 233°_??_α_??_28D=+22
tetramethyl-ether m.p. 168°
an acetate m.p, 130°
We-were not able in this case of gymnospermous needle tree to find any quantity of quercetin, which corresponds in its structure to distylin, although in angiosp-ermous broad-leafed tree 3-hydroxy flavanone and corresponding flavonol used to be found together.
