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. 04, 2000
Filed:
Nov. 22, 1999
Bruce C Berris, Baton Rouge, LA (US);
David W Owens, Baton Rouge, LA (US);
Rajeev S Mathur, Baton Rouge, LA (US);
Albemarle Corporation, Richmond, VA (US);
Abstract
Lithiated haloarenes, although useful as intermediates in the synthesis of various end products, can be hazardous to prepare since unstable, shock sensitive compounds can be formed during lithiation of haloarenes. To avoid this problem, a reaction of a polyhaloarene with a hydrocarbyl lithium compound is conducted in the presence of another reactant so that the lithiated haloarene, if formed at all, exists as a transitory intermediate in low concentration. In this way, transitory lithiated haloarene which may be, and presumably is, formed in the reaction is converted into a non-hazardous functionally-substituted haloarene essentially as soon as such lithiated haloarene is formed. Thus, an arene having a halogen atom of atomic number greater than 9 substituted on at least two non-adjacent carbon atoms is concurrently reacted with a non-fluoro halotrihydrocarbylsilane and a hydrocarbyl lithium compound, in proportions such that a haloarene having at least one trihydrocarbylsilyl ring substituent is formed.