松柏類および近縁植物成分の研究 第41報

Hinokiflavoneの構造研究 (5) Penta-O-methyl-hinokiflavoneのメタノール性水酸化バリウムによる分解

抄録

Decomposition of hinokiflavone pentamethyl ether, C₃₀H₁₃O₅(OCH₃)₅, with methanolic barium hydroxide solution is not a complicated reaction, unlike the case of ethanolic potassium hydroxide, and three substances, anisic acid, Substance Y (C₁₇H₁₆O₇), and 2-hydroxy-4, 6-dimethoxyacetophenone, are obtained in good yield. Such a fact proves that the structure of hinokiflavone proposed in the preceding report is reliable. A mild decomposition of hinokiflavone with ethanolic potassium hydroxide afforded a β-diketone corresponding to ketoflavone and its cycllzation gave a carboxy-flavone.