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• W2172037972 abstract "[161444-03-7] C60H36LaLi3O6 (MW 1027.69) InChI = 1S/3C20H14O2.La.3Li/c3*21-17-11-9-13-5-1-3-7-15(13)19(17)20-16-8-4-2-6-14(16)10-12-18(20)22;;;;/h3*1-12,21-22H;;;;/q;;;+3;3*+1/p-6 InChIKey = GDYOFHLDZVVKPX-UHFFFAOYSA-H [151736-98-0] C60H36LaLi3O6 (MW 1027.69) InChI = 1S/3C20H14O2.La.3Li/c3*21-17-11-9-13-5-1-3-7-15(13)19(17)20-16-8-4-2-6-14(16)10-12-18(20)22;;;;/h3*1-12,21-22H;;;;/q;;;+3;3*+1/p-6 InChIKey = GDYOFHLDZVVKPX-UHFFFAOYSA-H (heterobimetallic catalysts used for enantioselective organic transformations including carbon-carbon bond-forming reactions)1-7 Alternate Name: (R)-LLB [lithium tris{(1R)-[1,1′-binaphthalene]-2,2′-diolato(2−)-O, O′}-lanthanate(3−)], (S)-LLB[lithium tris {(1S)-[1,1′-binaphthalene]-2,2′-diolato(2−)-O,O′}-lanthanate(3−)], LaLi3tris[(R)-binaphthoxide], Li3(La[(R)-binol]3). Solubility: soluble in THF, toluene, and dichloromethane. Form Supplied in: pale yellow solution in THF. Analysis of Reagent Purity: 1H NMR or 13C NMR (not applicable to paramagnetic lanthanides). Preparative Methods: several different procedures are available. The most common one employs lanthanum(III) tri-isopropoxide [La(O-i-Pr)3] as a lanthanum source (eq 1).8-10 Although this method (Procedure A) produces the complex in high yield, the availability of La(O-i-Pr)3 might be limited. La(O-i-Pr)3 is also sensitive to air and moisture, and its purity and activity vary depending on the provider (we purchase the ampules from Kojundo Chemical Laboratory Co., Ltd., Japan). Use of the alternative method (Procedure B) can avoid these problems (eq 2):11, 12 lanthanum(III) trichloride heptahydrate (LaCl3·7H2O) is employed as a lanthanum source, which is much more accessible and much less expensive than La(O-i-Pr)3. It is essential to use the hydrate of lanthanum chloride; otherwise the catalyst will not be formed efficiently in the absence of H2O. Although Procedures A and B generate identical catalytic species, referral to the corresponding literature is recommended to determine which preparative method to adopt to obtain the best results. (1) (2) Purification: used as prepared Handling, Storage, and Precautions: store under argon atmosphere at ambient temperature. Stable in the presence of small amounts of water. Although the color of the solution might darken, the catalytic activity is preserved for over 6 months. Disposal: quench by the addition of diluted aqueous HCl. Dispose the aqueous layer after evaporation of THF and extraction of binaphthol with ethyl acetate." @default.
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• W2172037972 date "2003-10-15" @default.
• W2172037972 modified "2023-10-18" @default.
• W2172037972 title "Lanthanum(III)-Lithium-BINOL Complex" @default.
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