Studies on the Wood Extractivies (II) - Chemical Structures of Flavonoid Compound -

목재추출성분(木材抽出成分)에 관(關)한 연구(硏究) (II) - 플라보노이드화합물(化合物)의 화학구조(化學構造) -

In order to elucidate chemical structure of the wood extractives, softwood (Pinus koraiensis Sieb. et Zucc.) meal was extracted with 95% ethanol at room temperature for 72 hours. The extract was fractionated with organic solvents such as n-hexane, ether, ethylacetate, and acetone. From the n-hexane and ether soluble fraction of the wood extractives, four flavonoid compounds were isolated and identified as 5-hydroxy-7-methoxyflavone (I), 5-methoxy-7-hydroxyflavone (II), 5-hydroxy-7-methoxyflavanone (III), and 5-methoxy-7-hydroxyflavanone (IV) by UV, IR, $^1$H-NMR spectroscopy and MS spectrometry.