Preparation of alkylphenols

US5817891A · kind A · utility

Assignee

• BASF SE

Inventors

• Franz Josef Brocker · Ludwigshafen, DE
• Peter Trubenbach · Ludwigshafen, DE
• Manfred Baumann · Diepoldsau, CH
• Jurgen Schubert · Dirmstein, DE

Key dates

• Filing date: Sep 19, 1996
• Grant date: Oct 6, 1998
• Expiry date: Sep 19, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/07
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of alkylphenols of the formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 stand for hydrogen or C.sub.1 -C.sub.8 alkyl, by reaction of an alkylcyclohex-2-en-1-one of the formula II ##STR2## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 have the aforementioned meanings, at temperatures of from 200.degree. to 400.degree. C. and pressures ranging from 0.01 to 50 bar in the presence of palladium-on-.alpha.-Al.sub.2 O.sub.3 catalysts, wherein the catalyst used has a specific surface area (BET) of from 1 to 10 m.sup.2 /g, a pore diameter of from 5 nm to 300 .mu.m and a pore volume of from 0.1 to 0.5 cm.sup.3 /g, from 80 to 100% of the pores having a diameter of from 40 to 400 nm, and also novel palladium-on-.alpha.-Al.sub.2 O.sub.3 catalysts as obtained from a fine-grained alumina powder by steps of molding, pyrolysis and calcination.