Process for the catalytic preparation of 3-isochromanones from phthalans

US6002020A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Holger Geissler · Mainz, DE
• Daniel Decker · Castle Rock, US
• Peter Gross · Saarlouis, DE

Key dates

• Filing date: Jan 27, 1999
• Grant date: Dec 14, 1999
• Expiry date: Jan 27, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D311/76
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Good yields and selectivities are achieved in a process for preparing an isochroman-3-one of the formula (I) ##STR1## by reacting a 1,3-dihydroisobenzofuran of the formula (II) ##STR2## with carbon monoxide at a CO pressure of from 0.1 to 20 MPa in the presence of an ionic halide, a palladium catalyst and a dipolar aprotic solvent.