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:
Jul. 21, 1998
Filed:
Nov. 18, 1996
Stephen Martin Brown, Huddersfield, GB;
Martin Charles Bowden, Brighouse, GB;
Keith Moorhouse, Huddersfield, GB;
Zeneca Limited, London, GB;
Abstract
A process for preparing a compound of formula (I), ##STR1## where R.sup.1 is optionally substituted alkyl or phenyl, R.sup.2 is COOH, and R.sup.3 and R.sup.4 are independently selected from hydrogen, halo, haloalkyl, nitro, hydroxy, alkoxy, haloalkoxy or alkoxyalkoxy; which process comprises oxidising a compound of formula (II) ##STR2## where R.sup.1, R.sup.3 and R.sup.4 are as defined in relation to formula (I) and R.sup.5 is H, halo or C.sub.1-4 alkyl with sodium hypochlorite or sodium chlorite in the presence of a catalytic amount of a ruthenium or palladium compound and a phase transfer catalyst in an organic solvent at a pH of 7-11.