Podand‐Based Dimeric Chromium(III)–Salen Complex for Asymmetric Henry Reaction: Cooperative Catalysis Promoted by Complexation of Alkali Metal Ions. Issue 50 (24th October 2014)

• Record Type: Journal Article
• Authors: Ouyang, Guang‐Hui; He, Yan‐Mei; Fan, Qing‐Hua
• Is Part Of: Chemistry. Volume 20:Issue 50(2014)
• Page Start: 16454
• Page End: 16457
• Publication Date: 2014-10-24
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201404605
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A new kind of podand‐based dimeric salen ligand was synthesized, and its association with potassium cations was investigated by ¹H NMR spectroscopy. The corresponding Cr^III–salen dimer was assembled by a supramolecular host–guest self‐assembly process and was then used as a catalyst in highly efficient and enantioselective asymmetric Henry reactions. Regulation by KBAr_F (BAr_F=[3, 5‐(CF₃)₂C₆H₃]₄B) led to remarkable improvements in yield (by up to 58 %) and enantioselectivity (for example, from 80 % <italic>ee</italic> to 96 % <italic>ee</italic>).</p> </abstract>