(Pentabenzylcyclopentadienyl)molybdenum Complexes: Synthesis, Structures and Redox Properties

Pentabenzylcyclopentadienyl molybdenum and tungsten hydrides: Syntheses, structures and electrochemistry of [MHCpBz(CO)2(L)] (L=CO, PMe3, PPh3)

“…The lower m CO values revealed by the IR spectra of 1, 2 and 3 are consistent with the results obtained for other pentabenzylcyclopentadienyl molybdenum and tungsten compounds [30,44] and attest a more extensive metal-carbonyl back bonding in Cp Bz complexes in comparison with Cp and Cp * analogues.…”

“…It aims the comparison with analogous cyclopentadienyl complexes described in the literature, and assessing the influence of a very bulky cyclopentadienyl ligand on the compounds reactivity and properties [43,44]. 3 ] [30] in the presence of trimethyl-or triphenylphosphine. This is a common method for the replacement of one carbonyl ligand in molybdenum and tungsten half-sandwich tricarbonyl complexes that usually gives high product yields.…”

“…The proton may be captured by the medium, namely a base, the solvent or traces of H 2 O, or by the neutral hydride that may itself be susceptible to protonation, leading to cationic dihydrogen or dihydride compounds [25][26][27][28]. Electrochemical studies of halfsandwich molybdenum and tungsten complexes have received considerable attention and it was reported that subsequently to deprotonation, the 17-electron radicals may be trapped by the solvent and further oxidised or dimerize through radical coupling [24,[29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Molybdenum and Tungsten Catalysts for Hydrogenation, Hydrosilylation and Hydrolysis

“…The acidity of (CO) 4 CoH, the metal hydride involved in catalytic hydroformylations, is 8.3, which is similar to the acidity of HCl in CH 3 CN. Clearly, some metal hydrides can exhibit quite acidic behavior; Morris 53 and coworkers have discovered some remarkable dicationic dihydrogen complexes that have acidities comparable to or greater than that of HOTf [8] .…”

“…The crystal structures of both (C 5 Bz 5 )Mo(CO) 3 H (Bz = CH 2 Ph) and (C 5 Bz 5 )W(CO) 3 H were reported [53] . Catalytic hydrogenation of Et 2 C = O was studied in CD 2 Cl 2 , with Ph C BAr 3 4 + − ′ being used to abstract hydride from the neutral metal hydride.…”