Alternativ-Liganden, XVIII [1]: Neue Komplexe M(CO)3L mit Tripodliganden des Typs RSi(OCH2EMe2)3 (M = Cr, Mo, W; R = Me, Ph; E = P, As) / Alternative Ligands, XVIII [1]: Novel Complexes M(CO)3L with Tripod Ligands of the Type RSi(OCH2EMe2)3 (M = Cr, Mo, W; R = M e, Ph; E = P, As)

Abstract

Tripod ligands of the type RSi(OCH2EMe2)3 (R = Me, Ph; E = P, As) (compounds 3a, b and 4a, b) have been prepared by reacting RSiCl3 with Me2ECH2OH (2a, b) in the presence of NMe3. 2a, b are obtained from Me2EH (1a , b) and paraformaldehyde. Replacement of the cycloheptatriene ligand in M(CO)3CHT com pounds (M = Cr, Mo, W) yields the new complexes fac-M(CO)3[RSi(OCH 2EMe2)3] (5a, b-10a, b). The ligand properties of 3a, b and 4a, b have been studied by determining the effects of coordination on the spectroscopic data (νco , 1H, 31P NMR).