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In order to cope with the increasing number of publications on the separation of enantiomers by chromatography on a chiral stationary phase, the graphical molecular database CHIRBASE was created. In the present state, the database package covers information (structural, bibliographic, and chromatographic data) on liquid-, supercritical fluid-, and gas chromatography; other methods will follow. CHIRBASE, running on the MDL software Chembase, meets the requirements of contemporary information management in the chemical and pharmaceutical industry. (Detailed information including a demo-version of each part of CHIRBASE can be obtained from the authors on request).

Durch Einwirkung von Di‐tert‐butylthioxophosphoran (t‐Bu)2P(H)S auf Nickelocen in Ether erhält man den ersten kinetisch stabilisierten (η2‐Diorganothioxophosphor)‐ nickel‐Komplex [(η5‐C5H5)Ni(η2‐SP(t‐Bu)2)] (1). Bei Anwesenheit des Acetylendicarbonsäure‐dimethylesters H3CO2CCCCO2CH3 tritt mit (t‐Bu),PS Cyclocodimerisierung ein, unter Bildung des S‐ bzw. P‐isomeren Thiaphosphanickelacyclopentadiens (η5‐C5H5) (2S) und Thiaphosphanickelacyclopentens (η5‐C5H5)(2P) (RCO2CH3). Die Zusammensetzung und Struktur der Verbindungen 1, 2S und 2P ergibt sich aus den Massen‐, IR‐ und NMR‐Spektren.

No abstract

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