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. 21, 1990
Filed:
Jan. 26, 1989
Steffen Dapperheld, Kriftel, DE;
Rudolf Heumuller, Rodgau, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A process for the preparation of fluoromalonic acid and derivatives thereof having the formula ##STR1## wherein R.sup.2 and R.sup.3 are equal or different and represent hydroxyl, the group OX, wherein X represents an alkali metal, alkaline earth metal or NH.sub.4.sup.+ ion or a C.sub.1 -C.sub.12 -alkyl group, or represent the group NR.sup.4 R.sup.5, wherein R.sup.4 and R.sup.5 are equal or different and are hydrogen or a hydrocarbon group of 1 to 12 carbon atoms, which comprises subjecting a compound of the formula ##STR2## wherein R.sup.1 is halogen of an atomic weight in the range from 35 to 127 and R.sup.2 and R.sup.3 have the meaning indicated above, to an electrolysis in an electrolyte liquid consisting of water, an organic solvent or a mixture thereof, at a temperature in the range of from - 20.degree. C. to the boiling temperature of the electrolyte, at a current density in the range of from 1 to 600 mA/cm.sup.2 at a cathode consisting of lead, cadmium, zinc, copper, tin, zirconium, mercury, alloys of at least 2 of these metals or of carbon.