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. 16, 2005
Filed:
Aug. 07, 2002
Hidekimi Kadokura, Tokyo, JP;
Masamichi Matsumoto, Kumagaya, JP;
Tadashi Ishii, Ogose-machi, JP;
Yumie Okuhara, Yoshimi-machi, JP;
Yoshinori Kuboshima, Mizuho-machi, JP;
Hiroshi Matsumoto, Ageo, JP;
Hidekimi Kadokura, Tokyo, JP;
Masamichi Matsumoto, Kumagaya, JP;
Tadashi Ishii, Ogose-machi, JP;
Yumie Okuhara, Yoshimi-machi, JP;
Yoshinori Kuboshima, Mizuho-machi, JP;
Hiroshi Matsumoto, Ageo, JP;
Kabushikikaisha Kojundokagaku Kenkyusho, Saitama, JP;
Abstract
The invention provides true La(OiPr)preferable as a starting material for an asymmetric synthesis catalyst and a process for producing the same. In this process, anhydrous lanthanum chloride LaClis reacted with potassium isopropoxide K(OiPr) in a mixed solvent of isopropanol and toluene, then the isopropanol is distilled away to replace all the solvent by toluene, then the reaction solution is left, decanted and filtered to give a transparent filtrate, and the solvent is distilled away from the filtrate which is then vacuum-dried under heating, whereby high-purity La(OiPr)is obtained in 77% yield. In this high-purity La(OiPr), the La content is 97 to 103% of the theoretical content, impurity K is 0.3% or less, (Li+Na) is 0.01% or less, Cl is 0.2% or less, and the degree of association thereof is 5.5 to 6.5.