Stereochemistry and Circular Dichroism of Chiral Internal Olefin-Platinum(II) Complexes |
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| Authors: | Raffaello Lazzaroni Sergio Bertozzi Carlo Bertucci Piero Salvadori Piero Pino |
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| Affiliation: | 1. Centro di Studio del C.N.R. per le Macromolecole Stereordinate ed Otticamente Attive—Istituto di Chimica Organica, Facoltà di Scienze M.F.N., Università di Pisa, Italy;2. E.T.H., Technisch-Chemisches Laboratorium, Zürich, Switzerland |
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| Abstract: | A series of cis- and trans-dichloro(benzylamine) (chiral olefin) platinum(II) complexes, containing (Z) and (E) isomers of the internal chiral olefins R-CH=CH-R', has been prepared by ethylene displacement from the corresponding ethylene containing complexes. The particular stereochemical features of the complexes allow one to interpret the CD on the basis of the individual contributions coming from the chiral centres already present in the free olefin and from the chiral centres formed in the complexation of the double bond. Evidence is reported showing that the aforementioned contributions are additive and that the chiral centre(s) bound to the metal dominates the CD at about 400 nm, its chirality type being reflected in the sign and its chirality prevalence in the Δ? value. |
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