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:
Feb. 03, 1998
Filed:
Jun. 06, 1995
Rhone-Poulenc Chimie, Courbevoie Cedex, FR;
Abstract
Phenolic compounds, e.g., phenol, are hydroxylated, preponderantly into the para-isomer, e.g., hydroquinone, by reaction with hydrogen peroxide in the presence of an effective amount of a strong acid and a catalytically effective amount of a keto compound having the formula (II): ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, are each a hydrogen atom or an electron-donating group; n.sub.1 and n.sub.2, which may be identical or different, are numbers equal to 0, 1, 2 or 3, with the proviso that the two carbon atoms located at the .alpha.-position with respect to the two carbon atoms bearing the --CO group may be bonded together via a valence bond or via a --CH.sub.2 -- group, thereby forming a keto-containing ring member which may either be saturated or unsaturated.