“…[43] (M = Mo, W). Derivatives where the alkyl-or aryl-oxido scaffold is supported by additional Lewis bases (mostly N-donor ligands) are also known, such as [MO 2 (CH 3 ) 2 L 2 ] (M = Mo, W; L 2 = N-based chelating ligand such as a bipyridine [44][45][46][47][48] or a 1,4-diazadiene [44,49]), WO(CH 3 ) 4 (bipy) [46], and (XL 2 )MO 2 R (M = Mo, W; XL 2 = 3 -HB(3,5-Me 2 pz) 3 [50,51], 2-N-(2-pyridylmethyl)aminophenolato [52]). Compounds containing both alkyl and cyclopentadienyl derivatives, e.g.…”