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+ Stereochemistry
+ Isomers
+ Cyclohexane
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Posted by
Milan Woodson

Number of stereoisomers of 1,3,5-trimethylcyclohexane

Ayesha Khan  Follow

1,3,5-Trimethylcyclohexane doe not show optical isomerism as it has no chiral carbon atoms. Therefore, we are left with counting the total number of cistrans isomers.

1,3,5-Trimethylcyclohexane has two cistrans isomers which are given by structures 1 and 3 in your diagram.

1 and 2 are identical because if you look from behind the plane of the screen, 1 will turn into 2. Similar argument holds for 3 and 4. Hence we get two distinct cistrans isomers.

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