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:
Oct. 30, 1979
Filed:
Dec. 21, 1977
Klaus H Kaiser, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Hydroquinone mono-phenyl ethers, and their alkali metal salts of the formula ##STR1## in which one of the radicals R.sub.1 and R.sub.2 denotes trifluoromethyl and the other denotes hydrogen or halogen and R.sub.3 represents hydrogen or an alkali metal cation or ammonium cation are prepared by reacting hydroquinone bis-phenyl ethers (bisphenoxybenzenes) of the formula ##STR2## with hydroquinone derivatives of the formula ##STR3## in which Cat denotes an alkali metal cation or ammonium cation and R.sub.4 denotes an alkali metal cation or ammonium cation or a (C.sub.1 -C.sub.4)-alkyl group, in a polar aprotic solvent at temperatures from 120.degree. to 280.degree. C., and optionally, an alkyl group present in the R.sub.4 -position is split off by treatment with an acid.