Darstellung und Eigenschaften von Chromorganylen aus Phillips‐Katalysatoren und Ethylen
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Reaction of reduced Phillips catalysis with ethylene at 300 °C deactivates the catalyst; supported organochromium compounds are formed. These can be cleaved from the silica support by HCl and other acids, and transferred into solution by extraction with CH3OH. Chromatography yields fractions of organochromium compounds which differ by CH2 moieties. XPS, 1/2H NMR, and mass spectra as well as magnetic measurements prove that an ensemble of (RnCp)CrCl2(CH3OH) (RnCp = alkylated cyclopentadienyl) has been formed. The RnCp ligand results from a chromium-assisted oxidative coupling of the olefin with or without CC-cleavage. According to UV/Vis and mass spectroscopy Cl- and CH3OH can be substituted for other anions and donor molecules. Without a donor dinuclear, Cl-bridged molecules are obtained, of which [(1,2,3-Me3Cp)CrCl2]2 was established by crystal structure analysis. Reaction with O2 reversibly leads to chromium(V) compounds of the type (R2Cp)Cr(O)Cl2.
author list (cited authors)
Xing, Q., Milius, W., Krauss, H. L., Blümel, J., Hilbig, H., Köhler, F. H., Strauß, W., & Bayreuther, G.