Reduction of anhydrous magnesium chloride with potassium in refluxing THF in the presence of potassium iodide yields a black magnesium powder of exceptional reactivity, as demonstrated by its reaction with p-chlorotoluene, p-fluorotoluene, and other organic halides to give the corresponding Grignard reagents in high yields.
R. D. Rieke and S. E. Bales, J. Chem. Soc., Chem. Commun., 1973, 879 DOI: 10.1039/C39730000879
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