Seven-coordinate complex, reaction oxygen donor ligands

In 1962, Mannerskantz and Wilkinson described the reactions of [Mo(CO)4(2,5-dithiahexane)l with X2 (X = Br, I) to give the seven-coordinate complexes [MoX2(CO)3(2,5-dithiahexane)]. Treatment of the oxygen donor ligand complexes [M(CO)3(RPPh)] (M = Mo, W) RPPh = bis[(di-phenylphosphinyl)methyl]phenylphosphine oxide, [M2(CO)6(MDPO)] MDPO = methylenebis[diphenylphosphine oxide], and [M(CO)4(R... 

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