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The first 1,2-dihydro-1,2-diborete 1 (R1 NiPr2, R2 H) has been isolated in the form of colorless crystals. The C2B2 ring is planar. At 120°C, 1 rearranges into the thermodynamically more stable 1, 3-dihydro-1, 3-diborete 2.
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Hildenbrand et al. (1985) studied this question.
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