24510-71-2Relevant academic research and scientific papers
A phosphorus-31 nuclear magnetic resonance study of tertiary phosphine derivatives of group VI metal carbonyls. III. Disubstituted compounds
Grim, Samuel O.,Wheatland, David A.
, p. 1716 - 1719 (2008/10/08)
The preparation, infrared spectra, and phosphorus-31 nuclear magnetic resonance spectra are reported for 15 compounds of the type cis- and trans-L2M(CO)4, where M is Cr (trans only), Mo, or W, and L is tributylphosphine, dibutylphenylphosphine, or diphenylbutylphosphine. Phosphorus-31-tungsten-183 spin-spin couplings, which are observed in all of the tungsten compounds, are larger for the trans compounds than for the corresponding cis compounds. This is interpreted as being consistent with the π-bonding abilities of tertiary phosphines. The phosphorus chemical shift in the trans compound of a particular ligand is farther downfield than that for the corresponding cis compound.
