High-purity lanthanum isoproxide and a process for producing the same
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United States of America Patent
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Aug 16, 2005
Grant Date -
Mar 20, 2003
app pub date -
Aug 7, 2002
filing date -
Sep 20, 2001
priority date (Note) -
Expired
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Abstract
The invention provides true La(OiPr)3 preferable as a starting material for an asymmetric synthesis catalyst and a process for producing the same. In this process, anhydrous lanthanum chloride LaCl3 is 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)3 is obtained in 77% yield. In this high-purity La(OiPr)3, 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.
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