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Stereochemical Specification

R-7.1.0 cis-trans Isomerism - the E/Z Convention (Introduction)

Stereoisomers that differ only in the positions of atoms relative to a specified plane in cases where these atoms are, or are considered as if they were, parts of a rigid structure are specified by the use of the stereodescriptors cis and trans

Note: The Greek letters and in cases where these atoms are, or are considered as if they were, parts of a rigid structure are specified by the use of the stereodescriptors cis and trans or E and Z. are also used as stereodescriptors in specific classes of compounds, such as steroids.

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This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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