Process for the preparation of dicyclopentylene [2,2'-bis(4-alkyl-6-t-butylphenols)]

US4301311A · kind A · utility

Assignee

• Chemische Werke Lowi GmbH · DE

Inventors

• Rolf Muller · Karben, DE
• Werner Hartmann · Hamburg, DE
• Zdenek Kuca · Waldkraiburg, DE

Key dates

• Filing date: Jul 20, 1979
• Grant date: Nov 17, 1981
• Expiry date: Jul 20, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2603/68
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns a process for the preparation of dicyclopentylene [2,2'-bis(4-alkyl-6-t-butylphenols)] of the formula I ##STR1## wherein R.sub.1 is tertiary butyl and PA1 R.sub.2 is methyl or ethyl, by the reaction of 1.5 to 2.5 moles of a 4-alkyl-6-t-butyl-phenol of the formula II ##STR2## wherein R.sub.1 and R.sub.2 are as defined above, with 0.8 to 1.2 moles dicyclopentadiene at a temperature between 20.degree. and 120.degree. C. in the presence of an organic solvent and borontrifluoride or a complex thereof as catalyst, characterised by employment of specially selected solvents and reaction under practically anhydrous conditions.