In case of X-= As(C6H5)2 only nucleophilic addition to the carbyne carbon atom of 2a is observed to afford pentacarbonyl[(diethylamino)(diphenylarsino)carbene]tungsten (5). Complex 2d reacts with X-(X = SC,H,, OC,H,) at low temperature -or without X -on warming -to give trans-C1(CO),WCNEt2 (4f).
Das Auftreten des massenepektrometrisch nachgewiesenen Komplexes Pentacarbonyl(tetramethy1diarsan)chrom ( 5 ) laRt als Nebenreaktion zur reduktiven Dimerisierung der [ (CO)5CrCNEt21-Fragmente auch Abspaltung des Carbin-Liganden aus diesen und koordinative Absdttigung von [(C0)5Cr) durch / a / E. 0. Fischer, R. B. A. Pardy und U. Schubert, J. Organometal. Chem.
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