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:
Dec. 28, 2004
Filed:
Mar. 04, 2003
Applicant:
Inventors:
Oliver Meyer, Dorsheim, DE;
Helmut Heitger, Ingelheim, DE;
Assignee:
Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 4/109 ;
U.S. Cl.
CPC ...
C07C 4/109 ;
Abstract
The present invention relates to an improved process for preparing 4-(6-bromohexyloxy)-butylbenzene by reacting 4-phenylbutanol with 1,6-dibromohexane in the presence of a base and a phase transfer catalyst, wherein 4-phenylbutanol in a diluent is metered into a mixture consisting of 1,6-dibromohexane, a base, a phase transfer catalyst and a diluent, and the use of the 4-(6-bromohexyloxy)-butylbenzene thus prepared for producing salmeterol in a method known per se.