...To explain α and β, we must consider the ring structure of sugars. The aldehyde and ketone groups of monosaccharides usually form hemiacetals or hemiketals within the molecule. In the case of glucose, hemiacetal formation occurs with the hydroxyl group at the 5th position in the molecule, so that the glucose molecule forms a six-membered ring called a pyranose ring. ... *Some of the terminology that mentions "hemiacetal" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…α,βの説明のためには糖の環状構造に立ち入らなければならない。単糖のアルデヒド基,ケトン基は,通常分子内でヘミアセタールhemiacetal,またはヘミケタールhemiketalを形成している。グルコースの場合,ヘミアセタール形成は分子内の5位の水酸基と起こり,その結果,グルコース分子はピラノース環と呼ばれる6員環を形成する。… ※「hemiacetal」について言及している用語解説の一部を掲載しています。 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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