2H NMR Spectral Studies of Intramolecular Rearrangements in Pentaborane(9)

Joseph A. Heppert, Donald F. Gaines

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The rearrangement of various deuterium-labeled derivatives of pentaborane(9) in diethyl ether was studied by 11B and 2H NMR spectroscopy. Two distinct pathways for intramolecular exchange were identified at temperatures under 65 °C. One pathway allows movement from bridging positions to basal terminal positions, and a second higher energy pathway allows migration from basal terminal positions into the apex of the molecule. Exchange into and out of the apex of pentaborane appears to occur only when a substituent is one of the migrating groups. A mechanistic model for the isomerizations that conforms to the new data is suggested.

Original languageEnglish
Pages (from-to)3155-3161
Number of pages7
JournalInorganic Chemistry
Issue number21
StatePublished - Oct 1983


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