Preparation of p-cymene and homologous alkylbenzenes

US4720603A · kind A · utility

Assignee

• BASF SE

Inventors

• Roland Martin · Hamburg, DE
• Walter Gramlich · Edingen-Neckarhausen, DE

Key dates

• Filing date: Feb 20, 1987
• Grant date: Jan 19, 1988
• Expiry date: Feb 20, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C5/367
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Alkylbenzenes of the general formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, preferably methyl, and R.sup.2 is hydrogen or C.sub.1 -C.sub.4 -alkyl, preferably methyl, are prepared by catalytic aromatization of the corresponding alkenylcyclohexenes of the general formula II ##STR2## by carrying out the conversion in the gas phase at 150.degree.-400.degree. C. over a catalyst which contains palladium oxide and sulfur and/or selenium or selenium oxide on active carbon.