E–Z notation
CHEMICAL NOMENCLATURE DESCRIBING ABSOLUTE STEREOCHEMISTRY OF DOUBLE BONDS, GENERALIZING CIS–TRANS NOTATION
E-alkene; Entgegen; Zusammen; E-Z NOTATION; E-configuration; E alkene; E/Z configuration; E-Z designation; Entgegen-Zusammen system; (E); (Z); E-Z notation
E–Z configuration, or the E–Z convention, is the IUPAC preferred method of describing the absolute stereochemistry of double bonds in organic chemistry. It is an extension of cis–trans isomer notation (which only describes relative stereochemistry) that can be used to describe double bonds having two, three or four substituents.