"Molecules that differ from each other by rotation about single bonds are called conformational isomers or conformers. Derek H. R. Barton (…) showed that the chemical and physical properties of complicated molecules can be interpreted in terms of their specific or preferred rotational arrangements and that a knowledge of the conformations of molecules is crucial to understanding the stereochemical basis of many reaction."
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George S. Zweifel and Michael H. Nantz, Modern Organic Synthesis (2006), Ch. 2. Stereochemical Considerations in Planning Syntheses
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Conformational isomerism
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