A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Product Details of 18531-99-2, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 18531-99-2, Name is (S)-[1,1′-Binaphthalene]-2,2′-diol, molecular formula is C20H14O2. In a Article, authors is Gou, Shaohua，once mentioned of 18531-99-2
Enantioselective addition of diethylzinc to a series of aromatic aldehydes is developed using new chiral C2-symmetric ligand (S)-2,2?-(1,1?-binaphthyl-2,2?-diylbis(oxy))bis(methyl ene)bis(4-nitrophenol) (S)-2b. The catalytic system employing 10 mol % of (S)-2b and 120 mol % of Ti(OiPr)4 was found to promote the addition of diethylzinc to a wide range of aromatic aldehydes with electron-donating and electron-withdrawing substituents, giving up to 89% ee and up to 95% yield of the corresponding secondary alcohol under mild conditions.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI