Pure 4,7-bis(trimethylstannyl)dihydroacepentalene 1 can be transformed cleanly into dilithium acepentalenediide 2 by treatment with methyllithium. In the crystal 2 adopts an interesting dimeric structure in which the convex sides of the two bowl-shaped dianionic fragments face each other.
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Haag et al. (1995) studied this question.
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