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:
Jul. 14, 1992
Filed:
Dec. 06, 1990
Patricia P Gauthier, Cerny, FR;
Michel M Le Moult, Toulouse, FR;
Claude Rochelle, Toulouse, FR;
Jean-Pierre G Senet, Herbeauvilliers-Buthiers, FR;
Societe Nationale de Poudres et Explosifs, Paris, FR;
Abstract
The invention relates to a process for the preparation of chlorides of chlorinated carboxylic acids of formula ##STR1## in which R.sup.2 denotes the radical (CH.sub.2).sub.n, n being an integer from 2 to 4, or the radical --CH.sub.2 --C(C.sub.6 H.sub.5).sub.2 -- and R.sup.1 denotes a hydrogen atom or an alkyl radical containing from 1 to 4 carbon atoms, which consists in reacting the lactones of formula ##STR2## in which R.sup.1 and R.sup.2 have the above meanings, with phosgene at a temperature of 90.degree. to 180.degree. C., while employing as catalysts trisubstituted phosphine oxides or sulphides. The process according to the invention makes it possible to obtain chlorides of chlorinated carboxylic acids of high purity which exhibit an excellent stability to light and to heat and which are very useful as synthesis intermediates.