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. 12, 2005
Filed:
Nov. 11, 2002
Applicants:
Norihiro Tanaka, Shunan, JP;
Masao Yamaguchi, Shunan, JP;
Inventors:
Norihiro Tanaka, Shunan, JP;
Masao Yamaguchi, Shunan, JP;
Assignee:
Tokuyama Corporation, Yamaguchi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C570/262 ;
U.S. Cl.
CPC ...
Abstract
This invention discloses a process for preparing a dihalogenated adamantane by reacting an adamantane optionally substituted with alkyl at 1-position with a halosulfonic acid, comprising the first stage of monohalogenation conducted at −5 to 15° C. and then the second stage of dihalogenation conducted at 17 to 35° C., preferably in the absence of an organic solvent.