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Surprisingly facile at low temperatures is the synthesis of the first cyclobismuthanes 1 and 2 [Eq. (1)]. In solution 1 and 2 are in equilibrium. The four-membered ring 2 forms black crystals, which were structurally analyzed. At room temperature the rings decompose to elemental bismuth and R3Bi. R=(Me3Si)2CH.
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Breunig et al. (1998) studied this question.
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