Patent ID: 7566799

Claim:
A process for the preparation of alkylaryl compounds by a3) preparation of a C 12 -olefin mixture by trimerization of butenes in the presence of a catalyst obtained from a) a chromium compound CrX 3 and the quantity which is at least equimolar in relation to the chromium compound CrX 3, a ligand L or a finished chromium complex CrX 3 L, wherein the groups X independently or each other represent abstractable counter-ions and L represents a 1,2,5 triazacyclohexane of formula (1) wherein the groups R 1 to R 9 independently of each other represent hydrogen, Si-organic or optionally substituted C-organic groups containing 1 to 30 carbon atoms, whereby two geminal or vicinal radicals R 1 to R 9 can also be bonded to a five or six-membered ring and b) at least one activating additive or dehydrogenation of C 12 -alkanes in the presence of a Pt/Sn/Cs/K/La catalyst system on SiO 2, ZrO 2/ SiO 2, ZrO 2/ SiO 2/ Al 2 O 3, Al 2 O 3 or Mg(Al)O with optional upstream or downstream isomerization b3) reaction of the C 12 -olefin mixture obtained in stage a3) with an aromatic hydrocarbon in the presence of an alkylation catalyst to form alkylaromatic compounds, it being possible to add additional linear olefins prior to the reaction.