REACTIONS OF OSMIUM COORDINATED FORMALDEHYDE. SYNTHESIS OF COMPLEXES OF SELENOFORMALDEHYDE AND TELLUROFORMALDEHYDE

Article abstract of DOI:10.1016/0022-328X(83)80050-3

Os(η²-CH2O)(CO)2(PPh3)2 reacts with CSe2 to form a metallacycle .This compound breaks down to Os(η²-CH2Se)(CO)2(PPh3)2 with probable loss of COSe.An alternative route to Os(η²-CH2Se)(CO)2(PPh3)2 and also Os(η²-CH2Te)(CO)2(PPh3)2 is through reaction of Os- and TeH^-, respectively.HCl with Os(η²-CH2E)(CO)2(PPh3)2 (E = Se or Te) gives OsCl(EMe)(CO)2(PPh3)2 while methyl iodide gives 2-CH2EMe)(CO)2(PPh3)2>I.BH4^- reacts with these cations to cleave the C-E bond and form Os(CH3)(EMe)(CO)2(PPh3)2.