ChemInform Abstract: Detection of Carbene-Olefin Intermediates in Metathesis Catalysts Containing High-Valent Tungsten.
Abstract
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ChemInform Abstract
The catalytic ring-opening polymerization of cycloheptene (I) proceeds through the rearrangement of (III). By low-temp. 1H and 13C NMR spectroscopic characterization the formation of (III) by addition of ( I) to the carbene complex (II) is confirmed. If the temperature is raised above 255 K the catalytic polymerization of (I) begins, indicating that (III) can be considered as a true initial intermediate in the catalytic system.
