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:
Mar. 07, 1995
Filed:
Nov. 18, 1993
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Process for preparing hydroxybenzaldehydes of the formula (1) ##STR1## in which R.sup.1 -R.sup.4 are hydrogen, fluorine, chlorine, bromine, alkyl, alkoxy, phenyl, naphthyl, phenylalkyl, naphthylalkyl, phenoxy or saturated or unsaturated cyclopentane or cyclohexane radicals, and R.sup.1 -R.sup.4 may with the hydroxybenzene ring carbon atoms on which they are located form 1 or 2 saturated or unsaturated isocyclic or heterocyclic rings, by admixing 1 mol of a phenol of the formula (2) ##STR2## in which R.sup.1 -R.sup.4 have the stated meanings, in a pressure vessel with from 5 to 100 mol of hydrogen fluoride and from 0.5+x to 1.5+x mol of boron trifluoride, where x is the number of oxygen atoms contained in the starting compound (formula (2)), setting the mixture to from -10.sup..degree. to 100.degree. C. and then passing carbon monoxide into this mixture until a pressure of from 10 to 150 bar is reached and allowing the mixture to react at the desired pressure reached.