Übergangsmetall-substituierte phosphane,arsane und stibane : XXV. C5H5(CO)2[P(OMe)3]M-substituierte dioxaphospholane und dioxarsolane; stereochemische evidenz für den intermolekularen ablauf einer isomerisierung unter methylgruppenverschiebung |
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Authors: | Wolfgang Malisch Angelika Meyer |
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Affiliation: | Institut für Anorganische Chemie der Universität, Am Hubland, 8700 Würzburg Deutschland |
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Abstract: | 2-C5H5(CO)2[P(OMe)3]Mo(W)-substituted 4,4,5,5-tetramethyl-1,3,2-dioxarsolanes and -dioxaphospholanes (Ia–Ic) are obtained from C5H5(CO)3M derivatives via CO/P(OMe)3 exchange. In all cases the phosphite ligand appears trans to the σ-bonded arsenic heterocycle, which prefers a conformation with the transition metal group in an axial position. The dioxaphospholane-metal (Ia) undergoes isomerization with alkyl migration at 0°C, which due to stereochemical reasons can only occur by an intermolecular mechanism. |
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