Manganese(III) acetate

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Manganese Triacetate
IUPAC name Manganese Triacetate
Other names Manganese Triacetate Dihydrate; Manganese(III) acetate dihydrate
Identifiers
CAS number [19513-05-4]
Properties
Molecular formula C6H9MnO6.2(H2O)
Molar mass 268.10 g/mol (dihydrate)
Appearance Brown powder
Density 1.049 g cm−3, liquid; 1.266 g cm−3, solid
Hazards
R-phrases R36/37/38, R62, R63
S-phrases S26, S37/39
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Manganese(III) acetate or Manganese triacetate is an inorganic chemical that is usually found as the dihydrate, and often smells of acetic acid. Its structural formula is represented as C6H9MnO6.2(H2O). Anhydrous Manganese triacetate has been crystallised from acetic acid and the structure has been assigned as an oxo-centred trimer[1] with several bridging acetates.[2] Pure manganese trihydrate can be obtained by removal of water from the dihydrate.

Manganese triacetate is usually prepared from potassium permanganate and manganeous acetate in acetic acid.[3]

Mangese triacetate has been used as a single electron oxidant. It has been shown to oxidise oxidation of enones to give α'-acetoxy enones [4][5] It has also been used to oxidise α-alkyl β-keto esters,[6] and a variety of other 1,3 dicarbonyl compounds, via single electron transfer from Mn(III) to the dicarbonyl, generating Mn(II).

[edit] References

  1. ^ Hessel, L. W., and Romers, C., Recl. Trav. Chim. Pays-Bas, 1969, 88, 545 – 552
  2. ^ Fristad, W. E., Peterson, J. R. J. Org. Chem. 1985, 50, 10-17.
  3. ^ Conolly, J. W., Urry, G. Inorg. Chem. 1963, 2, 645-646.
  4. ^ G. J. Williams and N. R. Hunter, Can. J. Chem. 1976, 54, 3830
  5. ^ Norma K. Dunlap, Mark R. Sabol, and David S. Watt, Terrahedron Letters 1984, 25, 5839-5842
  6. ^ Snider, B. B., Patricia, J. J., Kates, S. A. J. Org. Chem. 1988, 53, 2137-2141.
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