For each boronic acid group in 1 one hydrogen atom makes a hydrogen bond to an alkyne carbon atom as well as an intermolecular O–H ⋯ O bond; structural effects indicate the boronic acid group to be σ-electron releasing and π-electron withdrawing.
M. Pilkington, J. D. Wallis and S. Larsen, J. Chem. Soc., Chem. Commun., 1995, 1499 DOI: 10.1039/C39950001499
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