Allyl molybdenum(II) and tungsten(II) compounds bearing bidentate and tridentate pyrazolylmethane ligands

Molybdenum complexes of poly[(methylthio)methyl]borates

“…The aim of this work is to evaluate coordination properties of two sulphur-donating scorpionate ligands toward molybdenum(II) complex [( 3 -C3H5)Mo(NCMe)2(CO)2Cl] (1). Such complex is well-known precursor of scorpionate complexes that enables, in particular case, to isolate κ 2intermediates as previously demonstrated on reaction with tris(pyrazolyl)methane [33]. In our case, reactivity of typical scorpionate ligand PhTt will be compared with RTt in order to describe the effect of additional (methylthio)methyl function, which could form donor-acceptor interaction with another Lewis acid.…”

Ruthenium(II) Tris‐Pyrazolylmethane Complexes in Transfer Hydrogenation Reactions

“…[34][35] Indeed, tripodal coordination involving three nitrogen atoms (k 3 ) is common for the tpm ligand, usually providing a substantial robustness to the resulting complexes, although alternative coordination fashions are also feasible. [36][37][38] Several complexes with tpm or substituted analogues, based on different transition metals, have been investigated as catalytic precursors in a variety of organic transformations. [39][40][41][42] The interchange between tri-and bidentate coordination is generally assumed to play an important role in the catalytic activity, [42] nevertheless this feature has been rarely ascertained in the literature.…”

“…Tris(pyrazolyl)methane (tpm) and related substituted molecules may be considered as arene surrogates, in that both types of compounds are neutral and can behave as six‐electron donor ligands towards transition metal centres [34–35] . Indeed, tripodal coordination involving three nitrogen atoms (κ 3 ) is common for the tpm ligand, usually providing a substantial robustness to the resulting complexes, although alternative coordination fashions are also feasible [36–38] . Several complexes with tpm or substituted analogues, based on different transition metals, have been investigated as catalytic precursors in a variety of organic transformations [39–42] .…”