Kabushikikaisha Kojundokagaku Kenkyusho

Tadashi Ishii

Hidekimi Kadokura

Yoshinori Kuboshima

Yumie Okuhara

Masamichi Matsumoto

Hiroshi Matsumoto

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.

High-purity lanthanum isoproxide and a process for producing the same

The invention provides a process for purifying gallium alkoxides by decreasing the amount of impurity chlorine contained therein, gallium alkoxides which are useful as raw materials for the formation of dielectrics containing gallium oxide and as raw materials for the syntheses of compounds for photoelectronics. Gallium isopropoxide containing 0.98 weight percent of chlorine and potassium isopropoxide of 1.4 equivalents to the impurity chlorine are refluxed in toluene as a solvent for 5 hours, the solvent is distilled away, and the residue is simply distilled under vacuum to obtain gallium isopropoxide containing 0.022 weight percent of the chlorine in a 89% yield.

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Ogose-machi, Japan

Tadashi Ishii