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. 20, 1976
Filed:
Apr. 11, 1974
Applicant:
Inventors:
Vasily Ivanovich Shvedov, Moscow, SU;
Alexei Nikolaevich Grinev, Moscow, SU;
Evgenia Nikolaevna Sytina, Moscow, SU;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260620 ;
Abstract
The method for preparing 3,5,3',5'-tetrabromo-2,4,2',4'-tetraoxydiphenyl consists in that 2,4,2',4'-tetramethoxydiphenyl is processed with an acid agent, such as aluminium chloride, aluminium bromide, or hydrogen bromide in acetic acid, in a medium of an organic solvent at a temperature up to 120.degree.C; the obtained 2,4,2',4'-tetraoxydiphenyl is then processed with bromine in a medium of an organic solvent and the end product is finally isolated.