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  • Title: Acid-labile δ-ketal-β-hydroxy esters by asymmetric hydrogenation of corresponding δ-ketal-β-keto esters in the presence of CaCO3.
    Author: Fan W, Li W, Ma X, Tao X, Li X, Yao Y, Xie X, Zhang Z.
    Journal: Chem Commun (Camb); 2012 May 04; 48(35):4247-9. PubMed ID: 22441717.
    Abstract:
    A series of acid-labile, optically pure ε-substituted δ-ketal-β-hydroxy esters were obtained by a Ru-SunPhos catalyzed asymmetric hydrogenation of the corresponding ε-substituted δ-ketal-β-keto esters. CaCO(3) played a dual role in the hydrogenation reaction--removing the acid generated during the formation of the catalyst and maintaining the activity of the catalyst.
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