Unsaturated hydrocarbons that contain one or more double carbon-carbon bonds in their molecules. In systematic chemical nomenclature alkene names end in the suffix -ene. Alkenes that have only one double bond form a homologous series (the alkene series) starting ethene (ethylene), CH2=CH2, propene, CH3CH=CH2, etc. The general formula is CnH2n. Higher members of the series show isomerism depending on position of the double bond; for example, butene (C4H8) has two isomers, which are (1) but-1-ene (C2H5CH=CH2) and (2) but-2-ene (CH3CH=CHCH3): see formulae. Alkenes can be made by dehydration of alcohols (passing the vapour over hot pumice):
An alternative method is the removal of a hydrogen atom and halogen atom from a haloalkane by potassium hydroxide in hot alcoholic solution:
Alkenes typically undergo addition reactions to the double bond. They can be tested for by the Baeyer test. See also hydrogenation; oxo process; ozonolysis; Ziegler process.
Alkenes
https://www.acdlabs.com/iupac/nomenclature/79/r79_53.htm Information about IUPAC nomenclature
- hukou
- Hulse, Russell Alan
- Hulse–Taylor pulsar
- Hulst, Hendrik Christoffell van de
- Hulst, Hendrik (‘Henk’) Christoffel van de (1918–2000)
- hum
- human
- human capital
- human chorionic gonadotrophin
- human computer interface
- human-computer interface
- Human Development Index
- human ecology
- human error
- human evolution
- Human Genome Project
- human geography
- human growth hormone
- human immunodeficiency virus
- human influence index
- humanism
- humanity, principle of
- human nature
- Human Suffering Index
- human–machine interface