Synthesis and characterization of oxoimido and alkylimido complexes of molybdenum(VI)

Abstract

Abstract Treatment of the complex Mo(Nmes)(O)Cl 2 (dme) (mes=2,4,6-trimethylphenyl; dme=1,2-dimethoxyethane) with KTp Me2 , NaCp and bipy gives the corresponding derivatives (Tp Me2 )Mo(Nmes)(O)Cl ( 1 ), CpMo(Nmes)(O)Cl ( 2 ) and Mo(Nmes)(O)Cl 2 (bipy) ( 3 ). Other oxoimido compounds of composition Mo(Nmes)(O)(S 2 CNR 2 ) 2 (R 2 =C 4 H 4 4 , C 5 H 10 5 , i Pr 2 6 ) can be obtained by reacting Mo(Nmes)(O)Cl 2 (dme) with the appropriate dithiocarbamate salt. The NMR properties of 4 – 6 are consistent with the presence of two rapidly equilibrating dithiocarbamate ligands. The reaction of Mo(Nmes)(O)Cl 2 (dme) with different Grignard reagents, Mg(R)X, produces the trialkyl imido complexes Mo(Nmes)R 3 Cl (R=Me 7 , CH 2 C(Me) 2 Ph 8 , CH 2 SiMe 3 9 ).