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The oxadiborirane 1 is unexpectedly unreactive. In this molecule the almost linear CBBC chain and very short BB distance agree with predictions based on ab initio calculations that suggest that 1 is a diborane(2) RBBR with a side-on coordinated O atom. Compound 1 is formed according to Equation (a) in 54 % overall yield. M = Na/K alloy.
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Paetzold et al. (1992) studied this question.
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