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Magazine Chapter 1: 22P (page 80)
For each pair of structures, determine whether they represent different compounds or a single compound.
a.
b.
c,
d.
Short Answer
a) Different compounds
b) Identical compounds
c) Different compounds
d) Identical compounds
Step by step solution
Configuration of compounds
Unsaturated compounds like alkenes that have restricted rotation due to C=C bond are geometrical isomers that is cis-trans or E/Z isomers.The compounds having opposite absolute configuration that is R and S are enantiomers (non-superimposable mirror images) while those having same absolute configuration are identical compounds.
Determining whether the compounds are different or same
a) The correct stereochemical descriptor for the compound is as follows:
Pair of Structure
The stereochemical descriptors are different and hence these are different compounds (geometrical isomers).
b) The correct stereochemical descriptor for the compound is as follows:
Pair of structures
These two compounds are identical as bond connectivity is same and chiral centers are absent.
c)
Pair of structures
The stereochemical descriptors are different and hence these are different compounds (geometrical isomers).
d) The correct stereochemical descriptor for the compound is as follows:
Pair of structures
The bond connectivity of all the atoms as well as the stereochemical descriptor remains the same. Hence, these compounds are same or identical.
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