Antiperiplanar geometry places two specified bonds at a torsion near . It often enables favorable orbital alignment in E2 elimination and supports large vicinal proton couplings in an appropriate calibrated Karplus relation.
A gauche interaction concerns groups separated by an approximately torsion about a bond. Its energetic effect depends on the groups and electronic environment; not every gauche geometry is unfavorable.
Ring inversion interconverts ring conformations while preserving covalent connectivity and configurational stereochemistry. In a cyclohexane chair flip, axial and equatorial labels exchange, while the up/down face of a given substituent is retained.
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