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Spectroscopic, structural, and theoretical evidence is provided for both open (no intramolecular P --> B interaction) and closed (with intramolecular P --> B interaction) forms of the di- and tri-phosphine boranes [o-(iPr(2)P)C(6)H(4)](2)BPh (2) and [o-(iPr(2)P)C(6)H(4)](3)B (3).
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Bontemps et al. (2007) studied this question.
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