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10.3: Hemiacetals, Hemiketals | 食品添加物合法業者資訊網

10.3: Hemiacetals, Hemiketals

2021年9月12日—Whenanalcoholaddstoanaldehyde,theresultiscalledahemiacetal;whenanalcoholaddstoaketonetheresultingproductisa ...

 10.3: Hemiacetals, Hemiketals

Overview

One of the most important examples of a nucleophilic addition reaction in biochemistry, and in carbohydrate chemistry in particular, is the addition of an alcohol to a ketone or aldehyde. When an alcohol adds to an aldehyde, the result is called a hemiacetal; when an alcohol adds to a ketone the resulting product is a hemiketal.

(The prefix ‘hemi’ (half) is used in each term because, as we shall soon see, addition of a second alcohol nucleophile can occur, resulting in species called acetals and ketals.)

The conversion of an alcohol and aldehyde (or ketone) to a hemiacetal (or hemiketal) is a reversible process. The generalized mechanism for the process at physiological pH is shown below.

Biochemical mechanism of hemiacetal formation:
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半缩醛 | 食品添加物合法業者資訊網
半缩醛（Hemiacetal）是一类同一碳上连有一个羟基，一个烷氧基和一个氢的有机化合物。半缩醛可由醛与醇反应得到，而半缩醛可以继续和醇反应得到缩醛。 Read More
Hemiacetal | 食品添加物合法業者資訊網
A hemiacetal or a hemiketal have the general formula R1R2C(OH)OR, where R1 or R2 is hydrogen or an organic substituent. They generally result from the ... Read More
hemiacetal | 食品添加物合法業者資訊網
中國大陸譯名: 半缩酮. 以hemiacetal 進行詞彙精確檢索結果. 出處/學術領域, 英文詞彙, 中文詞彙. Read More
Hemiacetal | 食品添加物合法業者資訊網
Aldehydes and ketones react with two moles of an alcohol to give products called acetals and ketals. If one mole of an alcohol reacts with one mole of an ... Read More
Cyclic hemiacetals and hemiketals (article) | 食品添加物合法業者資訊網
Intramolecular hemiacetal and hemiketal formation is commonly encountered in sugar chemistry. Just to give you an example: in solution, ~ 99% of glucose exists ... Read More
Formation of hemiacetals and hemiketals (video) | 食品添加物合法業者資訊網
Read More
10.3: Hemiacetals, Hemiketals | 食品添加物合法業者資訊網
2021年9月12日 — When an alcohol adds to an aldehyde, the result is called a hemiacetal; when an alcohol adds to a ketone the resulting product is a ... Read More
What Is a Hemiacetal? | 食品添加物合法業者資訊網
A hemiacetal forms when an aldehyde reacts with an alcohol. There are two different ways this can occur, as a neutral reaction or catalyzed with an acid. The ... Read More
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