Reaction and subsequent transformation of anionic acetylide-carbene complexes using the Ph3PAu+ fragment.
The metallated Fischer-type carbene complexes (CO)(5)M=C(NMe(2))C[triple bond]CLi (M = Cr, W) react with Ph(3)PAuNO(3) to form the beta-substituted products (CO)(5)M=C(NMe(2))C[triple bond]CAuPPh(3). In solution these products isomerise by formal metal fragment exchange to furnish Ph(3)PAuC(=NMe(2))C[triple bond]CM(CO)(5). A preliminary kinetic investigation by means of (1)H-NMR spectroscopy indicates an unusual and complicated reaction mechanism. Model DFT calculations predict small energy differences between the products before and after the metal fragment exchange.
Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland, 7602, Stellenbosch, South Africa.
Elzet
E
Stander
Catharine
C
Esterhuysen
Jean M
JM
McKenzie
Stephanie
S
Cronje
Helgard G
HG
Raubenheimer