When determining the Absolute R/S Configuration of a chiral center in a 3D Wedge-Dash projection, wh — Isomerism and Stereochemistry Chemistry Question
Question
When determining the Absolute R/S Configuration of a chiral center in a 3D Wedge-Dash projection, what is the configuration if the lowest priority group (Group 4) is located on the dashed wedge, and the $1 \rightarrow 2 \rightarrow 3$ priority sequence traces a clockwise path?
Answer: B
💡 Solution & Explanation
The IUPAC absolute configuration rules evaluate the $1 \rightarrow 2 \rightarrow 3$ path while looking directly down the carbon-to-group-4 bond. A dashed wedge implies the bond is pointing perfectly away from the observer. Since Group 4 is in the ideal viewing position, a clockwise trace accurately yields an 'R' (Rectus) configuration.
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