Abstract
We report the study of the net donating ability of monodentate and bidentate P ligands stemming from secondary phosphine oxides (SPOs). We experimentally measured and/or calculated the frequencies of CO stretching modes of various metal carbonyl complexes. The inferred electronic properties of the ligands span an unprecedented range, going from π-accepting phosphite-like compounds, to extremely electron-donating ligands outclassing N-heterocyclic carbenes.
A generous donation: The net donating ability of monodentate and bidentate P ligands stemming from secondary phosphine oxides (SPOs) is spread on an unprecedented range: from π-accepting phosphite-like compounds, as far as extremely electron-donating ligands outclassing N-heterocyclic carbenes (NHCs; see figure).
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