Cationic imido alkylidene complexes of molybdenum supported by β-diketonate and β-diketiminate ligands

Reaction of Mo(NAr)(CHCMe2Ph)(OTf)(2)(DME) (Ar = 2,6-i-Pr2C6H3) with the lithium salt of various beta-diketonates and beta-diketiminates leads to complexes of the type Mo(NAr)(CHCMe2Ph)(L)(OTf) (L = beta-diketonate or beta-diketiminate). Treatment of these compounds with NaB[3,5-(CF3)(2)C6H3](4) in dichloromethane affords rare examples of cationic imido alkylidene complexes. The solid-state structures of two of these compounds, {Mo(NAr)(CHCMe2Ph)(TMHD)(THF)}{B[3,5-CF3)(2)C6H3](4)} and {Mo(NAr)(CHCMe2Ph)(Ar-Cl-Nacnac)}{B[3,5-(CF3)(2)C6H3](4)} (TMHD = tetramethylheptanedionato, Ar-Cl-Nacnac = [2,6-Cl2C6H3NC(Me)](2)CH), have been determined by X-ray diffraction, and their reactivity with ethylene and other simple olefins has been explored.