Dithionous acid - adithionsan (English spelling)

Japanese: 亜ジチオン酸 - あジチオンさん(英語表記)dithonous acid
Dithionous acid - adithionsan (English spelling)
The chemical formula is H 2 S 2 O 4 . It was previously called hydrosulfurous acid or hyposulfurous acid, but the IUPAC nomenclature changed it to dithionous acid. It is also called dithionous acid. The free acid can be obtained by reacting sulfur dioxide with iron, zinc, or sodium amalgam in a closed vessel, but it is extremely unstable and decomposes into thiosulfuric acid, sulfur dioxide, and hydrogen sulfide. Dithionites include salts of alkali metals, alkaline earth metals, zinc, and cadmium. They can be obtained by suspending the metals in an organic solvent or water, or by passing them through sulfur dioxide as an amalgam.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
化学式H2S2O4。ヒドロ亜硫酸または次亜硫酸(ハイポ亜硫酸)と呼ばれていたが,IUPAC命名法で亜ジチオン酸に改められた。亜二チオン酸ということもある。遊離酸は密閉器中で二酸化硫黄に鉄,亜鉛,ナトリウムアマルガムを作用させると得られるが,きわめて不安定で,チオ硫酸,二酸化硫黄,硫化水素に分解する。亜ジチオン酸塩には,アルカリ金属,アルカリ土類金属,亜鉛,カドミウムなどの塩が知られている。金属を有機溶媒,水に懸濁させるか,アマルガムとして二酸化硫黄を通じると得られる。

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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