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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Cyclononene is a cycloalkene with a nine-membered ring, with two possible geometric isomers, denoted cis-cyclononene and trans-cyclononene, or (Z)-cyclononene and (E)-cyclononene.