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What is the absolute configuration of the compound represented below? CO2H | H — C — OH | H — C — Cl | CH3

1. (2S, 3S)
2. (2R, 3R)
3. (2R, 3S)
4. (2S, 3R)

Correct answer: (2S, 3R)

Solution

At C2 priorities OH>C3>CO2H>H; with H on a horizontal bond the apparent rotation is clockwise, inverted gives S. At C3 priorities Cl>C2>CH3>H; apparent counter-clockwise, inverted gives R. Configuration is (2S, 3R).

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