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bisecting conformation (eclipsing conformation)

For a structure containing the grouping R3C–C(Y)=X (with identical or different groups R ) the conformation in which the torsion angle is such that X is antiperiplanar to one of the groups R , and, in a Newman projection, the double bond C=X bisects one of the R–C–R angles. In this conformation the bond C–Yeclipses one of the C–R bonds. The other conformation, in which X is synperiplanar to one of the groups R , is called an eclipsing conformation.
PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2201
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
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