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The reaction of 1,1‐dibromo‐2,2‐bis(chloromethyl)cyclopropane (2) with methyllithium in ether led to a solution of [1.1.1]‐propellane (1) in a yield of 70%. 1 could also be prepared free of solvent by reaction of 2 with lithium powder in triglyme/n‐decane at 73°C.
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Belzner et al. (1989) studied this question.
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