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:
Aug. 30, 2005
Filed:
Sep. 18, 2002
Jonathan Simon Hill, Flixton, Manchester, GB;
Bernard Capai, Viarmes, FR;
Carlo Neri, Milan, IT;
Other;
Abstract
A process for the preparation of sulphonated phenols of general formula (I) where Ris hydrogen, a C-Calkyl group which is unsubstituted or substituted by halogen, cyano, hydroxyl, C-Calkoxy, C-Calkoxycarbonyl, acyloxy and/or phenyl which is unsubstituted or substituted by C-Calkyl, C-Calkoxy and/or halogen, Ris hydrogen, C-Calkyl or benzoyl of general formula (II) where Rand Rindependently of one another are each hydrogen, halogen, C-Calkyl, C-Calkoxy, C-Chaloalkyl, C-Ccycloalkyl, C-Ccycloalkylalkyl, cyano, hydroxyl, or hydroxyethyl or are each phenoxy, C-Cphenylalkyl or phenyl which is unsubstituted or substituted by C-Calkyl, C-Calkoxy and/or halogen, and Ris hydrogen or the group SOX where X can be hydrogen, a monovalent metal or a group —N(R), where each of the three radicals Rcan be independently of one another hydrogen, C-Calkyl or C-Chydroxy alkyl, which process comprises reacting a phenol of general formula (III) where Rand Rare as defined above, with a halosulphonic acid in a solvent which is a mixture of a C-Caliphatic or cycloaliphatic hydrocarbon and a dialkyl carbonate of general formula (IV) R—O—CO—O—Rwhere Rand Reach represent independently a C-Calkyl group