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:
Feb. 01, 1994
Filed:
Dec. 10, 1992
Applicant:
Inventors:
Roy A Olofson, State College, PA (US);
Ann P Lawson, Lancashire, DE (US);
Heather L Rayle, Los Angeles, CA (US);
Assignee:
Societe Nationale des Poudres et Explosifs, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560106 ;
Abstract
Process for obtaining aryl esters by O-dealkylation of an alkyl aryl ether with an acyl halide in the presence of a catalyst chosen from hexaalkylguanidinium salts and tetraalkylphosphonium salts. The alkyl aryl ether corresponds preferentially to the formula Ar(OR).sub.n in which R denotes an alkyl group, in particular a methyl group, n is an integer from 1 to 6 and Ar represents a C.sub.6 to C.sub.14 aromatic radical, a coumarinyl group or a group of a number of phenyl radicals. This process allows also the obtention of aromatic polyester.