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Although BH 3 simply coordinates the endocyclic P of (phospholidino)phosphaketene 1Dipp , the bulkier B(C 6 F 5 ) 3 gives rise to a zwitterionic diphosphirenium, which is a novel type of 2π-electron aromatic system as shown by the calculated NICS values.
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Hansmann et al. (2017) studied this question.
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