The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 2000
Filed:
Apr. 05, 1999
Holger Geissler, Mainz, DE;
Ralf Pfirmann, Griesheim, DE;
Clariant GmbH, Frankfurt, DE;
Abstract
The present invention relates to a process for preparing an isochroman-3-one of the formula (I) by reacting a 1,2-bishalomethylbenzene of the formula (II) ##STR1## in which X is chlorine, bromine or iodine with carbon monoxide and water at a CO pressure of from 0.1 to 50 MPa and a temperature of from 20 to 200.degree. C. in the presence or absence of an ionic halide, in the presence of a palladium catalyst and a dipolar aprotic solvent, where in the formulae (I) and (II) the radicals R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently of one another denote:
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile