An unexpected isosteric relationship with allenes was found for the diboroxane 1, which exists as a centrosymmetric dimer instead of as a linear monomer at −160°C. However, its structural parameters compare well with those calculated for dimeric allele. The tendency of 1 to dimerize may be due to the high Lewis acidity of boron and the high Lewis basicity of oxygen in diboroxanes as well as to the small substituents.
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Borrmann et al. (1989) studied this question.
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