Abstract
Long-range heteronuclear coupling has been observed between apex alkyl proton nuclei and both the apex (5.4–7.5 Hz) and basal boron (ca. 0.8 Hz) nuclei in apex alkyl substituted pentaborane(9) derivatives. Basal methyl substituted pentaborane(9) derivatives have also been investigated, and it has been shown that homonuclear long-range coupling is observed between the methyl protons and the near bridge hydrogen (2.9–3.3 Hz) nuclei. Similar homonuclear coupling was also detected for basal unsubstituted pentaborane(9) derivatives between the basal terminal protons and the near bridge hydrogen nuclei (4.8–5.7 Hz). Also discussed is the evidence for possible nuclear quadrupole relaxation of the heteronuclear and homonuclear coupling of the basal boron nuclei to apex substituents and apex boron nuclei, respectively.
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