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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hemiacetal ： ウィキペディア英語版 Hemiacetal Hemiacetals and hemiketals are compounds that are derived from aldehydes and ketones respectively. The Greek word ''hèmi'' means ''half''. These compounds are formed by formal addition of an alcohol to the carbonyl group. When the alcohol group is replaced by a second alkoxy group, an acetal or a ketal, respectively, is formed. == Formula and formation == The general formula of a hemiacetal is R1R2C(OH)OR, where R1 or R2 is often hydrogen and R (bonded to O) is not hydrogen. While in the IUPAC definition of a hemiacetal R1 or R2 may or may not be a hydrogen, in a hemiketal none of the R-groups is an H. Hemiketals are regarded as hemiacetals that have no R-groups being H, thus a subclass of the hemiacetals. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hemiacetal」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.