Dimethylmagnesium
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| Template:Longitem | Template:Chem2 |
| Molar mass | Template:Chem molar mass |
| Appearance | White solid |
| Density | 0.96 g/cm3 |
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Dimethylmagnesium is an organomagnesium compound with the chemical formula Template:Chem2. It is a white pyrophoric solid.[1][2] Dimethylmagnesium is used in the synthesis of organometallic compounds.
Preparation
Like other dialkylmagnesium compounds, dimethylmagnesium is prepared by adding dioxane to a solution of methylmagnesium halide:[3]
In such procedures, the dimethylmagnesium exists as the ether adduct, not the polymer.[4]
Addition of 1,4-dioxane causes precipitation of solid Template:Chem2, a coordination polymer.[4] This precipitation drives the Schlenk equilibrium toward Template:Chem2. Related methods have been applied to other dialkylmagnesium compounds.[5]
Dimethylmagnesium can also be prepared by combining dimethylmercury and magnesium.[6][7]
Calcium metal, magnesium metal and methyl iodide react in diethyl ether to produce dimethylmagnesium.[6]
Properties
Single crystals can be obtained by recrystallization of crude dimethylmagnesium from trimethylgallium.[3] The structure of this compound has been determined by X-ray crystallography. The material is a polymer with the same connectivity as silicon disulfide, featuring tetrahedral magnesium centres, each surrounded by bridging methyl groups. The Mg-C distances are 223 pm. The Mg-Mg distances are 272 pm.[3][8]
Related compounds
The linear chain structure seen for dimethylmagnesium is also observed for diethylmagnesium and dimethylberyllium.[9] Di(tert-butyl)magnesium is however a dimer.[10]
References
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