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:
May. 20, 1980
Filed:
Aug. 30, 1978
Jurgen Cramer, Eppstein am Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
p-Benzoquinone-diketals of the formual I ##STR1## in which R is H, (C.sub.1 -C.sub.4)-alkyl or halogen, and R.sup.1 is (C.sub.1 -C.sub.4)-alkyl, are prepared by anodic oxidation of benzene or an alkoxybenzene of the formulae ##STR2## in which R and R.sup.1 are as defined for formula I, in methanol containing less than about 5% by weight of water, in th presence of at least one alkali metal fluoride, ammonium fluoride and/or phosphonium fluoride as supporting electrolyte the pH being maintained below 7 by addition of HF. It is especially advantageous to carry out the anodic oxidation in a continuous-flow cell with the use of bipolar electrodes of glass-like carbon wherein the cathode surface is coated with a material reducing the hydrogen overvoltage, preferably titanium carbide.