Synthesis, Characterization and Reactivity of Bis(3-Ferrocenylpyrazol-1-Yl)Methane-Tetracarbonylmolybdenum and Tungsten

Abstract

Bis(3-ferrocenylpyrazol-1-yl)methane, CH₂(3-FcPz)₂, has been prepared by the reaction of 3-ferrocenylpyrazole with dibromomethane under phase transfer catalytic conditions. The reaction of CH₂(3-FcPz)₂ with M(CO)₆ (M = Mo or W) led to bis(3-ferrocenylpyrazol-1-yl)methanetetracarbonylmolybdenum(0) and tungsten(0) in good yield. Upon treatment of these complexes with I₂, the seven-coordinate Mo(II) and W(II) products were obtained. However, the reaction of these complexes with Br₂ led to decomposition. All new compounds were characterized by IR, ¹H NMR and elemental analyses.