Abstract The di-Grignard reagent methylenedimagnesium dibromide, CH 2 (MgBr) 2 (1), which can be prepared from dibromomethane and magnesium amalgam in diethyl ether/benzene 1/1, has been obtained in a pure form. Treatment of 1 with tetrahydrofuran gave insoluble 5 ″, a reagent with the approximate composition CH 2 Mg· CH 2 (MgBr) 2. Both reagents were used for the synthesis of the dimetallomethanes (Me 3 M) 2 CH 2 (M= ...
