Abstract
Intramolecular exchange or tautomerism is shown to be a common characteristic of many boron hydrides, boron hydride anions, and boron hydride Lewis Base adducts. Examples are B 10H 14, B 6H 10, B 5H 11, and B 2H 7 − in addition to those previousloy reported by others. It is suggested that the very generality of this internal rearrangement accounts for the lack of space isomers among the boron hydrides, boron hydride anions and boron hydride Lewis Base adducts. Tautomerism in the liquid phase (NMR studies) resolves certain apparent conflicts with solid phase X-ray studies. The relationship between the boron nuclear quadrupole moment and the NMR relaxation times (as influenced by tautomerism) is examined and the potential information is discussed.
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