Indicate whether each of the following structures is D-glyceraldehyde or L-glyceraldehyde, assuming that the horizontal bonds point toward you and the vertical bonds point away from you (Section 4.7):
a.
b.
c.

검증된 단계별 안내

Step 1: Recall the Fischer projection convention. In a Fischer projection, horizontal bonds represent groups pointing toward the viewer, while vertical bonds represent groups pointing away from the viewer.

Step 2: Identify the chiral center in glyceraldehyde. Glyceraldehyde has one chiral center, which is the carbon atom bonded to the hydroxyl group (-OH), the hydrogen atom (H), and the aldehyde group (-CHO).

Step 3: Determine the configuration of the chiral center. Assign priorities to the substituents based on the Cahn-Ingold-Prelog rules: (1) -CHO, (2) -OH, (3) -CH2OH, and (4) H.

Step 4: Analyze the arrangement of the substituents. If the -OH group is on the right side of the Fischer projection, the molecule is d-glyceraldehyde. If the -OH group is on the left side, the molecule is l-glyceraldehyde.

Step 5: Apply the above rules to each structure (a, b, c) provided in the problem. Carefully inspect the position of the -OH group in each Fischer projection to classify them as d-glyceraldehyde or l-glyceraldehyde.

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.

D and L Configuration

The D and L notation refers to the configuration of chiral centers in sugars. It is based on the orientation of the hydroxyl group (-OH) on the penultimate carbon (the second to last carbon) in the molecule. If the -OH group is on the right side in a Fischer projection, the sugar is designated as D; if it is on the left, it is designated as L.

Fischer Projection

A Fischer projection is a two-dimensional representation of a three-dimensional organic molecule, particularly useful for depicting carbohydrates. In this representation, vertical lines represent bonds that project away from the viewer, while horizontal lines represent bonds that come toward the viewer. Understanding how to interpret Fischer projections is essential for determining the D or L configuration of sugars.

Chirality and Stereoisomers

Chirality refers to the property of a molecule that makes it non-superimposable on its mirror image, leading to the existence of stereoisomers. In the case of glyceraldehyde, there are two enantiomers: D-glyceraldehyde and L-glyceraldehyde, which differ in the spatial arrangement of their atoms. Recognizing chirality is crucial for understanding the behavior and reactivity of organic compounds, especially in biological systems.

Indicate whether each of the following structures is D-glyceraldehyde or L-glyceraldehyde, assuming that the horizontal bonds point toward you and the vertical bonds point away from you (Section 4.7): a. b. c.