Determination of the Central Bond Length in Hexaarylethanes by Nutation NMR Spectroscopy

Nino Yannoni, Bart Kahr, Kurt Mislow

Research output: Contribution to journalArticle

Abstract

The lengths of the central bonds, rc, in [α,α'−13C2]hexakis(2,6-di-tert-butyl-4-biphenylyl)ethane (1) and [α,α' 13C2]hexakis(3,5-di-tert-butylphenyl)ethane (2) have been determined by nutation NMR spectroscopy. The dipolar spectra obtained by this method were compared with computed spectra in which the central bond length was the only adjustable parameter. Best fits of the experimental and computed spectra were found to correspond to a rc value between 1.64 and 1.65 Å for both compounds. These results are in excellent agreement with the X-ray value of rc in 2 and provide the first direct experimental evidence that the reported4 X-ray value of rc in 1 is grossly in error.

Original languageEnglish (US)
Pages (from-to)6670-6672
Number of pages3
JournalJournal of the American Chemical Society
Volume110
Issue number20
DOIs
StatePublished - Sep 1988

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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