What sugar is the C-3 epimer of D-fructose?

검증된 단계별 안내

Understand the concept of epimers: Epimers are stereoisomers that differ in configuration at only one specific carbon atom, while the rest of the molecule remains identical. In this case, we are looking for the C-3 epimer of D-fructose.

Recall the structure of D-fructose: D-fructose is a ketohexose, meaning it has six carbons and a ketone functional group at the C-2 position. Its Fischer projection shows the hydroxyl (-OH) groups on specific carbons (C-3, C-4, and C-5) in a particular arrangement.

Identify the C-3 position: In the Fischer projection of D-fructose, the C-3 carbon is the third carbon from the top, and its hydroxyl group is on the left side of the projection.

Generate the C-3 epimer: To create the C-3 epimer, invert the configuration of the hydroxyl group at the C-3 position. If the hydroxyl group is on the left in D-fructose, place it on the right for the epimer, while keeping the rest of the molecule unchanged.

Name the resulting sugar: After modifying the C-3 position, determine the name of the new sugar by comparing its structure to known ketohexoses. This will give you the name of the C-3 epimer of D-fructose.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Epimers

Epimers are a specific type of diastereomer that differ in configuration at only one stereogenic center. In the context of sugars, this means that two sugars can have the same molecular formula and differ only at one carbon atom's stereochemistry. Understanding epimers is crucial for identifying relationships between different sugars, such as d-fructose and its epimers.

D-Fructose Structure

D-fructose is a ketohexose sugar, meaning it contains six carbon atoms and a ketone functional group. Its structure includes a carbonyl group at C-2 and hydroxyl groups at the other carbons. Recognizing the structure of d-fructose is essential for determining its epimers, particularly by identifying the stereochemistry at C-3.

Sugar Nomenclature

Sugar nomenclature involves the systematic naming of carbohydrates based on their structure and stereochemistry. The prefixes 'D-' and 'L-' indicate the configuration of the sugar relative to glyceraldehyde, while terms like 'epimer' specify the type of stereochemical difference. Familiarity with this nomenclature is important for accurately identifying and discussing sugars and their relationships.