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,Benzene was alkylated successively with a mixture of 2-methyl-1-octene and 2-methyl-2-octene, with 2-butyl-l-octene, 3,7-dimethyLl-octene, 10-methyl-I-undecene and 3,3-dimethyl-l-undecene, using sulfuric acid and aluminium chloride as catalysts. In some cases, a considerable methide shift occurred.With sulfuric acid, there is a considerable preference for the formation of tertiary alkylbenzenes, even if the tertiary carbon atom is far removed from the double bond.Under the conditions used, aluminium chloride shows less preference for the formation of tertiary alkylbenzenes. The yields are low when, in the early stage of the reaction, a tertiary carbonium-ion type intermediate is formed. Particularly tertiary alkylbenzenes are unstable under alkylation conditions in the presence of aluminium chloride: dealkylation and isomerization to secondary alkylbenzenes occur.

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