Star (*) each asymmetric carbon atom in the following examples, and determine whether it has the (R) or (S) configuration.
(a)
(b)

검증된 단계별 안내

Step 1: Identify the asymmetric carbon atom in each molecule. An asymmetric carbon is a carbon atom bonded to four different groups. In both molecules, the central carbon atom is bonded to four distinct groups, making it asymmetric.

Step 2: Assign priorities to the substituents attached to the asymmetric carbon based on the Cahn-Ingold-Prelog priority rules. The rules state that the atom with the highest atomic number gets the highest priority. If two atoms are the same, consider the atoms directly bonded to them.

Step 3: Orient the molecule so that the lowest priority group (usually hydrogen) is pointing away from you. This ensures that you can correctly determine the configuration.

Step 4: Determine the order of the remaining three groups (1, 2, 3) based on their priorities. Trace a path from the highest priority group (1) to the second (2) and then to the third (3). If the path is clockwise, the configuration is (R). If the path is counterclockwise, the configuration is (S).

Step 5: Repeat the process for both molecules, ensuring that you carefully follow the priority rules and orientation guidelines to assign the correct (R) or (S) configuration for each asymmetric carbon.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

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주요 개념

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

Chirality

Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image. A chiral molecule typically contains an asymmetric carbon atom, which is bonded to four different substituents. This property is crucial in organic chemistry as it affects the molecule's interactions and biological activity.

R and S Configuration

The R and S configuration system is used to describe the spatial arrangement of substituents around a chiral center. To assign R or S, the substituents are ranked based on atomic number, with the highest priority assigned first. The configuration is determined by the orientation of the lowest priority group; if it is positioned at the back and the sequence of the other groups is clockwise, it is R; if counterclockwise, it is S.

Cahn-Ingold-Prelog Priority Rules

The Cahn-Ingold-Prelog priority rules are a set of guidelines used to assign priority to substituents attached to a chiral center. These rules state that higher atomic number atoms take precedence over lower ones, and in cases of ties, the next atoms in the substituent chain are considered. Understanding these rules is essential for accurately determining the R or S configuration of chiral molecules.

Star (*) each asymmetric carbon atom in the following examples, and determine whether it has the (R) or (S) configuration.(a) (b)