题目
题目

CHE 008B A01 SS1 2025 Lecture 8 - Hemiacetals and Acetals

多重下拉选择题

It is sometimes possible to isolate a pure hemiacetal. It is always possible to isolate a pure acetal.   Hemiacetals form with one equvalent or more alcohol present. Acetals form with must have excess alcohol present or a diol.

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思路分析
The prompt presents several statements about hemiacetals and acetals, and we need to weigh each one carefully by considering what is typically true in organic chemistry regarding hemiacetals and acetals and their formation/isolability. Option 1: "sometimes" - This statement refers to isolating a pure hemiacetal. In practice, hemiacetals are often in equilibrium with the corresponding carbonyl compound and an alcohol, and they can be quite reactive. However, in some cases, especially when the hemiacetal is part of a stable ring system or is otherwise protected, a pure hemiacetal can be isolated. Thus saying it is possible “sometimes” is reasonable, reflecting that isolation is not universal but can occur under favorable structural or protective conditions. - A potential pitfall: many he......Login to view full explanation

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