Tungsten carbonyl complexes bearing ?2- and ?3--chelating trisphosphine ligands were prepared from tungsten hexacarbonyl.  These complexes were characterized via 1H NMR, 31P NMR, IR spectroscopy, and elemental analysis.  The analogous molybdenum structures were determined by X-ray crystallography and shown by infrared spectroscopy to be analogous to their tungsten derivatives.  Of interest is the reaction of ?2 proceeding to the ?3--complex, which is found to be much more facile than anticipated for dissociative loss of a strongly bound metal-CO group.  This process will be discussed based on what I know with regard to the molybdenum and tungsten analogs.  Similar compounds have been shown to couple carbon dioxide and ethylene to give acrylates.1 (1)          Bernskoetter, W. H.; Tyler, B. T. Organometallics 2011, 30, 520.

Tungsten carbonyl complexes bearing multidentate phosphine ligands

243rd National Meeting (2012)

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