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Medientyp: E-Artikel Titel: Optically Active Phospholanes as Substituents on Ferrocene and Chromium‐Arene Complexes Beteiligte: Braun, Wolfgang; Calmuschi, Beatrice; Haberland, Jürgen; Hummel, Werner; Liese, Andreas; Nickel, Thomas; Stelzer, Othmar; Salzer, Albrecht Erschienen: Wiley, 2004 Erschienen in: European Journal of Inorganic Chemistry Sprache: Englisch DOI: 10.1002/ejic.200300685 ISSN: 1434-1948; 1099-0682 Schlagwörter: Inorganic Chemistry Entstehung: Anmerkungen: Beschreibung: <jats:title>Abstract</jats:title><jats:p>An improved synthesis of (<jats:italic>R</jats:italic>,<jats:italic>R</jats:italic>)‐ and (<jats:italic>S</jats:italic>,<jats:italic>S</jats:italic>)‐hexane‐2,5‐diol is presented. The (<jats:italic>S</jats:italic>,<jats:italic>S</jats:italic>)‐derivative was converted into a cyclic sulfate, which on treatment with NaPH<jats:sub>2</jats:sub> in liquid ammonia ultimately gave the secondary (<jats:italic>R</jats:italic>,<jats:italic>R</jats:italic>)‐2,5‐dimethylphospholane. This phospholane can be introduced into the side chain of chiral tricarbonylchromium and ferrocene derivatives to give new bidentate ligands of the Josiphos and Daniphos type. Both the ferrocene‐ and tricarbonylchromium‐based diphosphanes have been characterized by X‐ray diffraction analysis. A discussion of their structural features is included. The new ligands were successfully applied to the enantioselective hydrogenation of itaconic acid esters. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)</jats:p>