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Abstract
2, 2, 3, 3-Tetramethylcyclopropyllithium has been prepared by the reaction of l-bromo-2, 2, 3, 3-tetramethylcyclopropane with lithium metal in diethyl ether medium and its half-life in this solvent at room temperature was determined to be 38 hr. Its reactions with trimethylchlorosilane and with trimethyltin chloride, with hydrolytic work-up, gave 2, 2, 3, 3-tetramethylcyclopro-pyltrimethylsilane and 2, 2, 3, 3, -tetramethylcyclopropyltrimethyl-tin, respectively. However, such. a reaction with trimethylchlorosilane effected without hydrolytic work-up resulted in formation of 2, 2, 3-trimethyl-3-butenyltrimethylsilane instead.