Process for preparing polyalkyl tetrahydronaphthalenes

Details Process for preparing polyalkyl tetrahydronaphthalenes Process for preparing polyalkyl tetrahydronaphthalenes

C - Chemistry, Metallurgy

07

C

260/680.6

C07C 2/74 (2006.01) C07C 2/72 (2006.01) C07C 13/48 (2006.01)

Patent

CA 2008365

TITLE Process for Preparing Polyalkyl Tetrahydronaphthalenes ABSTRACT A process is disclosed for the production of polyalkyl tetrahydronaphthalenes wherein a cyclialkylation reaction between an olefinic compound of the general formula Image [VI] where R4, R5, R5 and R7 are independently defined and each is a substituent which does not interfere substantially with a Friedel-Crafts reaction, and a substituted benzene compound, is carried out in the presence of an alkyl halide or, in some embodiments, hydrogen halide, a Lewis acid, and, optionally, a phase transfer agent and a hydride abstracting reagent. In some embodiments, the subject process is specifically carried out in the absence of elemental iodine. The subject process, which may be practiced in an unhalogenated hydrocarbon solvent, produces the desired compounds in a surprisingly high yield, with a surprisingly high selectivity to the desired product, and at relatively high rate of reaction, using better, more convenient or less expensive process methodology than many processes known heretofore.

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