Dithiahexane

Another related procedure has been employed by Flint and Goodgame,2S who reacted finely ground Ni(C104)2 aq directly with 2,5-dithiahexane for several weeks. The blue solid formed by this reaction was repeatedly ground and then treated further with the ligand until the v(OH) absorption of water could no longer be detected in the IR spectrum of the product. 

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... 

Cr(CO)6 is resistant to oxidation by halogens, unlike its Mo and W analogues. No reaction occurs with Br2 or I2 at RT CI2 effects oxidation to CrCla and phosgene. On the other hand, substitution of the carbonyl ligands by weaker tr-acid donors, such as bipyridine, thio ethers, or arsines, leads to complexes that are more easily oxidized. In some cases, such as Cr(CO)4L (L2 = 2,2 -bipyridine or 2,5-dithiahexane ), spectro-photometric changes and loss of CO are consistent with oxidation by Br2 and I2, though no isolable complex was obtained. If L is bis(l,2-dimethylarsino)benzene (diars), oxidation to Cr(diars)X3 (X = Br, I) occurs these Cr(III) complexes are likely dimers . ... 

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