Nomenclature
CAS number: 70197-13-6
(
T-4)-Methyltrioxorhenium; MTO.
CH
3O
3Re; mol wt 249.24.
C 4.82%, H 1.21%, O 19.26%, Re 74.71%.
CH
3ReO
3.
Description and references
Acts as an oxidation catalyst by transferring
an oxygen atom from one species to another; hydrogen peroxide is often
the oxygen source. Prepn: I. R. Beattie, P. J. Jones, Inorg. Chem. 18, 2318 (1979);
W. A. Herrmann et al., Angew. Chem.
Int. Ed. 27, 394 (1988). Catalytic uses: idem et al., ibid. 30, 1636, 1638, 1641
(1991). Photochemistry studies: H. Kunkely et al., Organometallics 10, 2090 (1991);
L. J. Morris et al., ibid. 20, 2344 (2001). Review of catalytic chemistry: J.
H. Espenson, Chem. Commun. 1999, 479-488; F. E. Kühn, W. A. Herrmann, Chemtracts Org. Chem. 14, 59-83 (2001).
Properties
Colorless solid, mp 110°. d23 4.21. Sol in acetonitrile, benzene, chloroform,
ethanol, ether. Sparingly sol in carbon disulfide, hexane. Soly
at 25° (g/l): water ≈50; forms a golden ppt, poly-MTO. uv max (hexane): 205, 231, 260 nm (ε 1600, 1500, 1020). uv max (aqueous): 239, 270 nm (ε 1900, 1300). Air and moisture stable, Tdec >300°.Derivative
Poly-MTO.
Description and references
First known "polymeric" organometallic
oxide. Formed by MTO in aqueous soln. Prepn: W. A. Hermann, R.
W. Fischer, J. Am. Chem. Soc. 117, 3223 (1995). Structural study: idem et al., ibid. 3231.
Properties
Golden solid with graphite-like consistence and
reflectance. d23 4.38. Insol in practically all inorganic and organic solvents.
Electric resistivity (25°): 6×10-3 Ω cm.Use
Versatile organometallic catalyst active in oxidation
reactions, olefin isomerization, epoxidation and metathesis.