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. 03, 2005
Filed:
Nov. 20, 1999
David George Leppard, Marly, CH;
Eugen Eichenberger, Basel, CH;
René Kaeser, Rechthalten, CH;
Gebhard Hug, Rheinfelden, CH;
Urs Schwendimann, Baleares Mallorca, ES;
David George Leppard, Marly, CH;
Eugen Eichenberger, Basel, CH;
René Kaeser, Rechthalten, CH;
Gebhard Hug, Rheinfelden, CH;
Urs Schwendimann, Baleares Mallorca, ES;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
A description is given of processes for the preparation of mono- and bisacylphosphines and of mono- and bisacylphosphine oxides and mono- and bisacylphosphine sulfides, which comprises first reacting organic P-monohalogenophosphines or P,P-dihalogenophosphines, or mixtures thereof, with an alkali metal or magnesium in combination with lithium, where appropriate in the presence of a catalyst, and then carrying out the reaction with acid halides and, in the case of the process for the preparation of oxides, carrying out an oxidation step and, in the case of the preparation of sulfides, reacting the phosphines so obtained with sulfur. It is characteristic, inter alia, that the processes are carried out without isolation of the intermediates.