Question

CO5T0306483 What is the correct IUPAC name of the following compound? (15,2R)-1-ethyl-2-methylcyclohexane (1R, 2S)-1-ethyl-2-methylcyclohexane (1R 2R)-1-ethyl-2-methylcyclohexane (15,2S)-1-ethyl-2-methylcyclohexane

Answer 1

The IUPAC name will be

(1S, 2R) -1-ethyl-2-methylcyclohexane

Explanation: The assignment of the two chiral centers are shown below. Here the carbon having more substitution will have more priority. Thus the carbon with two carbon and one hydrogen attached to it will have more priority than a carbon with one other carbon and two hydrogens attached to it. Using this principle, the substitution of the chiral center have been given their priority. Thus we get the carbon at 1 position to have S configuration and the center at 2 position will have R configuration.

. من F 3