Phosphine oxide complexes

The P=0 —> Sn bonds in phosphine oxide complexes (Table 24) are somewhat shorter than those found in the same carbonyl (Table 23), sulfoxide (Table 25) and A-oxide (Table 26) complexes, reflecting the greater Lewis basicity of the former. 

The six-coordinate phosphine oxide complexes of diorganotins 5011053, 502a1054, 502b1055 and 503127 adopt the common cis-geometry at the Sn atom. 

Table 49 Structures Some Phosphine Oxide Complexes of Cobalt(II)...

Ligands having oxygen as donor atom are also able to form many complexes with Zn and Cd. These include phosphine oxide complexes such as tetrahedral [Zn(0PPh3)4](C104)2,67 pyridine oxide complexes, the simplest of which is [Cd(pyO)6][CdCl4],68 alkoxides, M(OR)2, carbamates,69 and phosphates.70... 

Table 41 Structurally characterized examples of actinyl phosphine oxide complexes.

The tautomeric species thus formed were thought to be the plausible active species in the phosphine oxidation. Complex 182 was shown to exhibit catalytic properties in the selective oxidation of various organic substrates (137). 

CCC (1987) contains a section on sulfoxides, amide, amine oxides, and related ligands that have sections on phosphine oxides and arsine oxides.159 Phosphine and arsine oxide complexes of yttrium and the lanthanides were highlighted in CCC (1987).1 Scandium and yttrium phosphine oxide complexes have been reinvestigated and characterized by multinuclear NMR and X-ray... 

Use of Chiral Phosphine-Oxide Complexes in the Catalytic Enantioselective C-C Bond Formation... 

---