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:
Apr. 26, 1988
Filed:
Jul. 06, 1987
Applicant:
Inventors:
David R Brackenridge, Baton Rouge, LA (US);
Bonnie G McKinnie, Magnolia, AR (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
568639 ; 568776 ; 568637 ;
Abstract
A process for partially brominating non-condensing ring aromatics (e.g. diphenyl ether) in the absence of a solvent by adding the polyaromatic to a stoichiometric excess of liquid bromine containing a zirconium halide catalyst. Product containing three bromine atoms per benzene ring (e.g., hexabromodiphenyl ether) is formed in high selectivity by keeping the reaction mixture below a threshold temperature at which higher bromine substitution occurs.