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:
Sep. 25, 2007
Filed:
Nov. 12, 2003
Johannes Ruwwe, Niederkassel, DE;
Klaus Stadtmueller, Alzenau, DE;
Johannes Ruwwe, Niederkassel, DE;
Klaus Stadtmueller, Alzenau, DE;
Degussa AG, Duesseldorf, DE;
Abstract
Alkali metal salt of formula (I): MOYXR(I), and its solution can be prepared in high yields, particularly high space-time yields, and with high purities by reacting an alcohol of the formula (Ia): HOYXR(Ia), in a solvent mixture with an alkali metal salt of formula (II): MOR(II), or by reacting the alcohol (Ia) in a solvent mixture with an alkali metal hydroxide. Part of the liberated alcohol of formula (IIa): HOR(IIa) or a part of the liberated water is distilled from the solvent mixture, initially, without addition of an entrainer. Subsequently, a remainder of the liberated alcohol of formula (IIa) or the liberated water is distilled from the solvent mixture with the aid of at least one organic solvent as entrainer. In formula (I) and in formula (II), M is Li, Na, K, Rb or Cs. In formula (I) and in formula (Ia): Y is (C-C)-alkylene, X is O, S or NR, and Ris H, (C-C)-alkyl, (C-C)-alkenyl, (C-C)-alkynyl, (C-C)-cycloalkyl, (C-C)-aryl, (C-C)-aralkyl, (C-C)-heteroaryl, (C-C)-heteroaralkyl, ((C-C)-alkyl)-(C-C)-cycloalkyl, ((C-C)-alkyl)-(C-C)-aryl or ((C-C)-alkyl)-(C-C)-heteoraryl. In formula (II) and in formula (IIa), Ris methyl, ethyl, propyl, isopropyl, sec-butyl, isobutyl or tert-butyl.