Xanthone - Kisanton (English spelling) xanthone

Japanese: キサントン - きさんとん(英語表記)xanthone
Xanthone - Kisanton (English spelling) xanthone
It corresponds to dibenzo-γ-pyrone and is also called 9-xanthenone. It is a white needle crystal with a melting point of 174°C and a boiling point of 350°C (730mmHg). It is insoluble in water, but is soluble in benzene and chloroform. Xanthone itself does not occur in nature, but is found as an oxy derivative in plants of the Gentianaceae family such as gentian, and as a hydroxy derivative in mango fruit. When concentrated sulfuric acid is added, it becomes a yellow solution that emits pale blue fluorescence. It is synthesized by heating phenyl salicylate or by condensation of salicylic acid and acetic anhydride.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ジベンゾ‐γ‐ピロンに相当し,9‐キサンテノンともいう。白色針状晶で融点174℃,沸点350℃(730mmHg)。水に不溶だが,ベンゼン,クロロホルムなどにはよく溶ける。キサントン自身は天然には存在しないが,ゲンチシンなどリンドウ科の植物にオキシ誘導体として,またマンゴーの果実などにヒドロキシ誘導体として含まれる。濃硫酸を加えると淡青色の蛍光を発する黄色溶液となる。サリチル酸フェニルの加熱またはサリチル酸と無水酢酸の縮合によって合成される。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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