Kinetische Untersuchungen über Substitutionsreaktionen an Metallkomplexen. 7. Mitteilung [1]. Kinetik und Mechanismus der Reaktion von Methoxyorganylcarbenpentacarbonyl-chrom-Verbindungen mit tertiären Phosphinen |
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| Authors: | H Werner H Rascher |
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| Institution: | Anorganisch-Chemisches Laboratorium der Technischen Hochschule, München Anorganisch-Chemisches Institut der Universität Zürich |
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| Abstract: | The kinetics of the reactions of methoxyorganylcarbenechromium complexes Cr(CO)5C(OCH3)R′ (R′ = CH3, C6H5) with tertiary phosphines PR3 have been studied by means of spectrophotometric methods. The reaction products of general composition cis-Cr(CO)4(PR3)C(OCH3)R′, Cr(CO)5PR3 and trans-Cr(CO)4(PR3)2 are formed by cleavage of both the Cr-CO and the Cr-C(carbene) bonds. The two-term rate law indicates two parallel, dissociative and associative, mechanisms. The kinetic data will be discussed in connection with the concept of labilising and non-labilising ligands. |
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