Cyclononene is a

cycloalkene A cycloalkene or cycloolefin is a type of alkene hydrocarbon which contains a closed ring of carbon atoms and either one or more double bonds, but has no aromatic character. Some cycloalkenes, such as cyclobutene and cyclopentene, can be used as m ...

with a nine-membered ring, with two possible

geometric isomers Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is ca ...

, denoted ''cis''-cyclononene and ''trans''-cyclononene, or (''Z'')-cyclononene and (''E'')-cyclononene.

References

Cycloalkenes Nine-membered rings {{alkene-stub