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:
Aug. 03, 2010
Filed:
Dec. 29, 2006
Wanbin Zhang, Shanghai, CN;
Yongjian Zhang, Shanghai, CN;
Feijun Wang, Shanghai, CN;
Shanghai Jiaotong University, Shanghai, CN;
Abstract
The present invention relates to a method for preparing 2,2',6,6′-tetraoxazolinyl biphenyl ligand in chemical industry field. In the present invention, compound (III) is reacted with an activator that can activate the hydroxyl group selected from the group consisting of alkyl halosulfonium compound, aryl halosulfonium compound, phosphoryl chloride, phosphorus pentachloride, thionyl chloride and triphenyl phosphine, in the presence of alkali(s), to give the target product (IV), 2,2′,6,6′-tetraoxazolinyl biphenyl ligand. The ligand of the present invention can be used in various asymmetric reactions catalyzed by metals, with high reactivity and stereoselectivity, and thus represents a good application outlook. The 2,2′,6,6′-tetraoxazolinyl biphenyl ligand has the formula of: