Linear alkylbenzene sulfonates (LAS) are prepared industrially by the sulfonation of linear alkylbenzenes (LABs), which themselves can be prepared in a variety of ways. In the most common route, benzene is alkylated by long-chain monoolefins such as dodecene using hydrogen fluoride as a catalyst. The purified dodecylbenzene (and related derivatives) are then sulfonated with sulfur trioxide to give the sulfonic acid. The LABSA 96% is then neutralized with sodium hydroxide. The term “linear” refers to the starting alkene rather than the final product, no completely linear addition products were seen, following Markovnikov’s rule. Thus, the alkylation of linear alkenes, even 1-alkenes such as 1-dodecene, yields several isomers of phenyldodecane
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