Phosphane Complexes of Alkaline Earth Metals

✍ Scribed by Hans H. Karsch; Manfred Reisky

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 325 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199807)1998:7<905::aid-ejic905>3.0.co;2-y

✦ Synopsis

The reaction of lithium[bis(dimethylphosphanyl)(trimethyl-(SiMe 3 )] 3 } -(8) was obtained. This compound is not only the first reported hexacoordinated magnesate, but also the first silyl)methanide] Li[(PMe 2 ) 2 C(SiMe 3 )] with BeCl 2 gave the homoleptic compound Be[(PMe 2 ) 2 C(SiMe 3 )] 2 (5) with four magnesium compound with six magnesium-phosphorus bonds. With CaCl 2 and Li[C(PMe 2 ) 2 (SiMe 3 )], a heptacoor-beryllium-phosphorus bonds constituting a distorted tetrahedron around the beryllium center. The reaction of dinated complex Ca[(PMe 2 ) 2 C(SiMe 3 )] 2 • 3 THF (10) with three coordinating THF ligands was isolated. The complexes MgCl 2 with Li[(PMe 2 ) 2 C(SiMe 3 )] resulted in the formation of the bis-chelate complex Mg[(PMe 2 ) 2 C(SiMe 3 )] 2 • 2 THF (7), were characterized using 9 Be{ 1 H}-, 31 P{ 1 H}-, 1 H-, 13 C{ 1 H}-NMR spectroscopy, and elemental analysis and by X-ray where the distorted cis-octahedral magnesium center is additionally coordinated by two THF ligands. In the reaction diffraction. The neutral compounds are highly soluble in nonpolar solvents. of 7 with an additional equivalent of Li[C(PMe 2 ) 2 (SiMe 3 )], THF is released and the magnesate anion {Mg[(PMe 2 ) 2 C-