Unsaturated Hydrocarbons

hydrocarbons containing one or more multiple carbon-carbon bonds. Among the unsaturated hydrocarbons are olefins, or alkenes, of the general formula C_nH_2n (for example, ethylene, CH₂ ═ CH₂, and propylene, CH₃CH ═ CH₂), and also hydrocarbons of the general formula C_nH_{2n - 2}; (1) unsaturated hydrocarbons containing a triple bond, called alkynes (acetylene, CH≡CH, and its homologues); (2) diene hydrocarbons containing conjugate double bonds (butadiene, CH₂═CH═CH—CH═CH₂) or cumulated bonds (allene, CH₂═C═CH₂, and its homologues); (3) cycloalkenes (naphthenes containing a double bond—for example, cyclohexene).

The class of unsaturated hydrocarbons also includes enins, C_nH_{2n - 4,} which contain a double bond and a triple bond, and polyenes. Unsaturated hydrocarbons of the aromatic series with general formula C_nH_2n - 6 have properties very different from those of more common hydrocarbons and therefore constitute a separate class of organic compounds.

单词	unsaturated hydrocarbons
释义	Unsaturated Hydrocarbons Unsaturated Hydrocarbons hydrocarbons containing one or more multiple carbon-carbon bonds. Among the unsaturated hydrocarbons are olefins, or alkenes, of the general formula C_nH_2n (for example, ethylene, CH₂ ═ CH₂, and propylene, CH₃CH ═ CH₂), and also hydrocarbons of the general formula C_nH_{2n - 2}; (1) unsaturated hydrocarbons containing a triple bond, called alkynes (acetylene, CH≡CH, and its homologues); (2) diene hydrocarbons containing conjugate double bonds (butadiene, CH₂═CH═CH—CH═CH₂) or cumulated bonds (allene, CH₂═C═CH₂, and its homologues); (3) cycloalkenes (naphthenes containing a double bond—for example, cyclohexene). The class of unsaturated hydrocarbons also includes enins, C_nH_{2n - 4,} which contain a double bond and a triple bond, and polyenes. Unsaturated hydrocarbons of the aromatic series with general formula C_nH_2n - 6 have properties very different from those of more common hydrocarbons and therefore constitute a separate class of organic compounds.
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