Methylrhenium trioxide

Methylrhenium trioxide
methylrhenium trioxide
Identifiers
CAS number 70197-13-6
Properties
Molecular formula CH3ReO3
Molar mass 249.24 g/mol
Appearance white powder
Melting point

112 °C (385 K)

Solubility in water highly soluble in water
Hazards
MSDS External MSDS
S-phrases S22, S23, S24/25
 YesY trioxide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Methylrhenium trioxide, also known as methyltrioxorhenium, is an organometallic compound with the formula CH3ReO3. It is a volatile, colourless solid has been used as a catalyst in some laboratory experiments. In this compound, Re has a tetrahedral coordination environment with one methyl and three oxo ligands. The oxidation state of rhenium is +7.

Synthesis

Methylrhenium trioxide is commercially available. It can be prepared by many routes, a typical method is the reaction of Re2O7 and tetramethyltin:[1]

Re2O7 + (CH3)4Sn → CH3ReO3 + (CH3)3SnOReO3

Analogous alkyl and aryl derivatives are known. Compounds of the type RReO3 are Lewis acidic, forming both 1:1 and 1:2 adducts with halides and amines.

Uses

Methylrhenium trioxide serves as a heterogeneous catalyst for a variety of transformations. Supported on Al2O3/SiO2, it catalyzes olefin metathesis at 25 °C.

In solution, MTO catalyses for the oxidations with hydrogen peroxide. Terminal alkynes yield the corresponding acid or ester, internal alkynes yield diketones, and alkenes give epoxides. MTO also catalyses the conversion of aldehydes and diazoalkanes into an alkene.[2]

References

  1. ^ Herrmann, W. A.; Kratzer R. M.; Fischer R. W. (1997). "Alkylrhenium Oxides from Perrhenates: A New, Economical Access to Organometallic Oxide Catalysts". Angew. Chem. Int. Ed. Engl. 36 (23): 2652–2654. doi:10.1002/anie.199726521. 
  2. ^ Hudson, A. “Methyltrioxorhenium” Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons: New York, 2002.

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • MTO — can refer to any of the following: Coles County Memorial Airport in Mattoon Charleston, Illinois, has IATA code MTO The ISO 639 3 code for Totontepec Mixe Made to order, Manufacturing of standard products to supply customer orders and/or customer …   Wikipedia

  • Organomanganese chemistry — is the chemistry of organometallic compounds containing a carbon to manganese chemical bond. In a recent review Cahiez et al. argue that as manganese is cheap and benign (only iron performs better in these aspects), organomanganese compounds have …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”