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:
Jun. 20, 1995
Filed:
Aug. 17, 1994
Jean-Pierre Lecouve, Mulhouse, FR;
Albemarle Corporation, Richmond, VA (US);
Abstract
An improved process for the preparation of 1,6-dibromo-2 -naphthol is disclosed. The improvement is accomplished by carrying out the reaction in an organic solvent at a temperature of from about 40.degree. to about 60.degree. C. in the presence of a catalytically-effective amount of a compound of the formula: ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are alkyl, cycloalkyl, phenyl, substituted phenyl, naphthyl, substituted naphthyl heteroaryl, substituted heteroaryl or R.sub.1 taken together with R.sub.2 and the nitrogen atom form a heteroaryl or substituted heteroaryl group in which the heteroatom is nitrogen and X is an inorganic anion.