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Any of the three bonds in the C2B ring of C-borylated boriranes can be cleaved thermally with formation of C-borylmethyleneboranes 1, diboratetrahydronaphthalenes, or (after reaction of the appropriate boriranes with ethyl vinyl ether) dihydroboroles depending on the substituents. The electrocyclic exothermic ring-opening known for the transformation of cyclopropenylium ions into allyl cations has not been observed previously for the isoelectronic boriranes; according to calculations the ring-opening is endothermic. R = SiMe3.
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Willerhausen et al. (1992) studied this question.
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