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|Section2= |Section3= }} Sodium dodecylbenzenesulfonate (also commonly referred to as linear alkylbenzene sulfonate or LAS) is a series of organic compounds with the formula C12H25C6H4SO3Na. It is a colourless salt with useful properties as a surfactant. It is usually produced as a mixture of related sulfonates. It is a major component of laundry detergent.〔Kurt Kosswig,"Surfactants" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, 2005, Weinheim. 〕 ==Alkylbenzenesulfonates== Most sodium dodecylbenzenesulfonates are a member of the ''linear'' alkylbenzenesulfonates, meaning that the dodecyl group (C12H25) is unbranched. This dodecyl chain is attached at the 4-position of the benzenesulfonate group. Linear dodecyl-4-benzenesulfonate anions can exist in six isomers (ignoring optical isomers), depending on the carbon of the dodecyl group that is attached to the benzene ring. The isomer shown below left is 4-(5-dodecyl)benzenesulfonate (4 indicating the position of the benzene ring, 5 indicating the position on the dodecane chain). Branched isomers, e.g. those derived from tetramerized propylene, are also known (below right) but are not as widely used because they biodegrade too slowly. Sodium dodecylbenzenesulfonate.png|4-(5-Dodecyl) benzenesulfonate, a linear dodecylbenzenesulfonate Branched ABS.png|A branched dodecylbenzenesulfonate, which has been phased out in developed countries. Further complicating the description of the commercial materials, sodium dodecylbenzenesulfonate is one component of a mixture of compounds that feature variable alkyl chain lengths aside from C12, mainly ranging from C10-C16. Dodecylbenzenesulfonate is considered representative of the entire class of compounds, since the mean number of alkyl carbon atoms in the alkylbenzenesulfonates is 12. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「sodium dodecylbenzenesulfonate」の詳細全文を読む スポンサード リンク
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