1. Indicate whether the pair of structures shown represent stereoisomers, constitutional isomers,
different conformations of the same compound, or the same conformation of a compound viewed
from a different perspective. Note that cis, trans isomers are an example of stereoisomers. HO ??
CI OCH3 CH3 H3C OCH3
Solution
1. The compounds are (1S,3S)-3-chlorocyclohexan-1-ol and (1S,3R)-3-chlorocyclohexan-1-ol,
the only difference is the change in conformation at C3 from S to R, i.e. diastereomers, so they
are stereoisomers .
2. Both are the structure is of (1s,4s)-1-methoxy-4-methylcyclohexane, they are just represented
differently, so they are the same conformation of a compound viewed from a different
perspective.