Scandium complexes phosphines

Amine A-oxides, phosphine oxides and other phosphoryl compounds and analogous arsenic derivatives, and sulfoxides all give well-defined complexes with scandium. In many cases, authors deal with several of these classes of ligand in the same paper, so it will be most convenient to consider them together here. 

The coordination of the nitrate groups in the complexes of phosphine and arsine oxides already discussed is generally symmetrically bidentate. However, in Rb2[Sc(N03)5] there are three biden-tate and two monodentate nitrates, resulting in eight-coordination for scandium, in contrast to (N0" ")2[Sc(N03)5] , where one monodentate and four bidentate nitrates give nine-coordinate scandium. ... 

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... 

A hydrophobic polymer-supported scandium(III) catalyst was also successfully used in the Michael reaction of unsaturated ketones with silyl enol ethers. Recently, an amphiphilic resin-supported rhodium/phosphine complex was used as catalyst in the 1,4-addition of various boronic acids to enones in water at 25°C. High yields were obtained and the catalyst was easily separated and subjected to a second and third round of reactions with no decrease in activity. ... 

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