94929-43-8Relevant academic research and scientific papers
Synthesis of carbyne complexes of chromium, molybdenum, and tungsten by formal oxide abstraction from acyl ligands
McDermott, Gregory A.,Dorries, Alison M.,Mayr, Andreas
, p. 925 - 931 (1987)
Reaction of the acyl metal complexes [NMe4][M(C(O)R)(CO)5] (R = C6H5, M = Cr, Mo, W; R = CH3, M = W) with the Lewis acids COCl2, C2O2Cl2, C2O2Br2, and ClC(O)OCCl3 in CH2Cl2 at low temperatures (≤-78°C) and subsequent warming of the solutions (≤0°C) lead to clean formation of trans-halo(carbyne)tetracarbonylmetal complexes, [M(CR)(X)(CO)4] (X = Cl, Br). The carbyne complexes [M(CR)X(CO)4] are transformed into stabilized derivatives [M(CR)X(CO)2L2] by the addition of donor ligands (L2 = (pyridine)2 (py), tetramethylethylenediamine (tmeda), bipyridine (bpy)). The complex [W-(CPh)(O2CCF3)(CO)2(tmeda)] is prepared in a similar reaction sequence from [NMe4][W(C(O)Ph)(CO)5], (CF3CO)2O, and tmeda. Reaction of [NMe4][W(C(O)Ph)(CO)5] with C2O2Br2 and 1 equiv of PPh3 gives [W(CPh)Br(CO)3(PPh3)]. The bis(pyridine)-substituted complexes [W(CPh)Cl(CO)2(py)2] undergo further substitution reactions with PMe3 and Ph2PCH2CH2PPh2 (dppe) to give [W(CPh)Cl(CO)2(PMe3)2] and [W(CPh)Cl(CO)2(dppe)].
