Re, Si

abbreviation: CIP
https://doi.org/10.1351/goldbook.R05308
A stereoheterotopic face of a trigonal atom is designated Re if the ligands of the trigonal atom appear in a clockwise sense in order of CIP priority when viewed from that side of the face. The opposite arrangement is termed Si.
See also: enantiotopic, prochirality
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2216 [Terms] [Paper]
Citation: 'Re, Si' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.R05308 RIS BibTex EndNote
Div. IIIPDFTextXMLJSON
Last revised: February 24, 2014