75731-22-5

Basic information

• Product Name: Os(C(O)CH₃)H(CO)2(P(C₆H₅)3)2
• CAS NO: 75731-22-5
• Molecular Weight: 814.856
• Mol File: 75731-22-5.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: Os(C(O)CH₃)H(CO)2(P(C₆H₅)3)2(CAS DataBase Reference)
• NIST Chemistry Reference: Os(C(O)CH₃)H(CO)2(P(C₆H₅)3)2(75731-22-5)
• EPA Substance Registry System: Os(C(O)CH₃)H(CO)2(P(C₆H₅)3)2(75731-22-5)

Safety Data

• Hazardous Substances Data: 75731-22-5(Hazardous Substances Data)

Upstream product

• 79725-76-1 osmium (ethylene)(carbonyl)2(triphenylphosphine)2 
• 307498-17-5 Os(κ2(C,P)-C6H4PPh2)H(CO)2(triphenylphosphine) 
• 35880-55-8 Os(CO)2(PPh₃)3 
• 75-07-0 acetaldehyde 

Downstream Products

• 33635-55-1 Os(CO)3(triphenylphosphine)2 

Relevant articles and documents

SYNTHESIS, STRUCTURE AND REACTIONS OF A dihapto-FORMALDEHYDE COMPLEX, Os(η2-CH2O)(CO)2(PPh3)2

Os(η2-CH2O)(CO)2(PPh3)2 results from direct reaction of formaldehyde with the zerovalent complex, Os(CO)2(PPh3)3.The structure of Os(η2-CH2O)(CO)2(PPh3)2 was determined by X-ray crystallography.The crystals are triclinic, space group P, a 18.739(2), b 11.157(1), c 9.986(1) Angstroem, α 116.70(1), β 93.20(1), γ 107.93(1) deg, V 1727.69 Angstroem3, Z = 2, Dm 1.55(2), Dc 1.57 g cm-3.Refinement of atomic parameters was by full-matrix least-squares methods, employing anisotropic thermal parameters for all non-hydrogen atoms except for the carbon atomsof the phenyl rings.The formaldehyde hydrogen atoms were located from difference electron density maps, other hydrogens were included in calculated positions.Final residuals were R = 0.047 and Rw = 0.061 for 3508 unique observed reflections measured on an automatic diffractometer.The complex itself is monomeric, although interstices in the crystal lattice are occupied by hydrogen-bonded water dimers which fulfil a purely space-filling role.The osmium is bonded to two mutually trans triphenylphosphines, two carbonyls, and the η2-formaldehyde, in an arrangement which is best described as distorted octahedral.The geometry of the coordinated formaldehyde is characterised by Os-O 2.039(7), Os-C 2.186(8) and C-O 1.584 (11) Angstroem.The Os-P bonds are equivalent at 2.372(2) and 2.378(2) Angstroem but the Os-CO bond trans to the formaldehyde carbon 1.931(7) Angstroem is longer than that trans to the formaldehyde oxygen 1.907(7) Angstroem.Os(η2-CH2O)(CO)2(PPh3)3 has proved to be a useful synthetic precursor for stable formyl, hydroxymethyl, methoxymethyl, and halomethyl (CH2X, X = Cl, Br, I) complexes.The compoundsOs(CHO)H(CO)2(PPh3)2, Os(CH2OH)H(CO)2(PPh3)2, Os(CH2OMe)Cl(CO)2(PPh3)2 and Os(CH2Cl)Cl(CO)2(PPh3)2 are illustrative of the many compounds which have been characterised.A general synthetic route to neutral formyl osmium complexes, Os(CHO)X(CO)2(PPh3)2 (X = halide or alkyl) has been developed from reaction of the cations + with BH4-.Acetaldehyde also reacts with Os(CO)2(PPh3)3 forming Os(η1-CCH3)H(CO)2(PPh3)2.No reaction was observed with benzaldehyde, and trichloroacetaldehyde affords the cation, +.