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In sunlight, 1-plumba-3,4-diborolane 1 reacts to form the 1,2-diboretan derivative 2. This rearranges on warming to the thermodynamically more stable 1,3 isomer 3. Compound 2 is also accessible from the corresponding diboratabutadiene dianion by oxidative coupling.
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Littger et al. (1993) studied this question.
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