Methylrhenium trioxide

Methylrhenium trioxide

Names
Other names methyltrioxorhenium
Identifiers
CAS Number	70197-13-6 Y
3D model (JSmol)	Interactive image
ChemSpider	10621726 N
ECHA InfoCard	100.202.821
InChI InChI=1S/CH3.3O.Re/h1H3;;;; N Key: PQTLALPZRPFYIT-UHFFFAOYSA-N N InChI=1/CH3.3O.Re/h1H3;;;;/rCH3O3Re/c1-5(2,3)4/h1H3 Key: PQTLALPZRPFYIT-YHFCCQKIAF
SMILES C[Re](=O)(=O)=O
Properties
Chemical formula	CH3ReO3
Molar mass	249.24 g/mol
Appearance	white powder
Melting point	112 °C (234 °F; 385 K)
Solubility in water	highly soluble in water
Hazards
Safety data sheet	External MSDS
S-phrases (outdated)	S22, S23, S24/25
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

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

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

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

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, and the oxidation of amines to N-oxides with sodium percarbonate.