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An ethene analogue with a BB bond and two negatively charged boron centers (2) is formed from the reduction of 1 with lithium powder to 2-2 Li. Based on UV data, the BB bond energy is estimated at 40 kcal mol−1. This double bond is formed at the expense of two BN bonds in 1, as reflected in the significant lengthening of the BN bonds on transition from 1 to 2.
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Moezzi et al. (1992) studied this question.
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