Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 47

Editor: Neville Compton; Editor Emeritus: Peter Gölitz

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPhotoChem, ChemPlusChem, Zeitschrift für Chemie

Cover Picture (Angew. Chem. Int. Ed. Engl. 4/1985)

24_04/1985The cover page shows schematically the main area of research of the Max-Planck-Institut für Kohlenforschung in Mülheim: the synthesis and structure elucidation of organometallic compounds and the study of their catalytic activity. The activity and selectivity of (η5-RC5H4)Co(cod) catalysts in the synthesis of pyridine is controlled by the R residue. If R is a donor, the 59Co-NMR signals are shifted upfield and the catalytic activity decreases; the R-C bond is orthogonal to the schematically drawn double bonds of the COD ligand (structure and measured points on right side). If R is an acceptor, Co is deshielded and the catalytic activity increases; the R-C bond is parallel to the COD double bonds (structure and measured points on left side). Further details on the structure-activity relationships for cobalt complexes in homogeneous catalysis are reported by H. Bönnemann in a review on p. 248.

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