Trapping of methyleneborane 7a with 3-hexine yields the stable 1,2-dihydroborete 1a . Strong folding (148.8°) along the 1,3-diagonal. the short 1.3-distance (191.5 pm), a lengthened 3,4- and a shortened 1,4-bond prove the homoborirene nature of 1a.
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Pues et al. (1988) studied this question.