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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > June  >
In the Laboratory
Hydrogen Bonding Using NMR: A New Look at the 2,4-Pentanedione Keto–Enol Tautomer Experiment
Alexander Grushow
Department of Chemistry and Biochemistry, Rider University, Lawrenceville, NJ 08648-3001

Theresa Julia Zielinski
Department of Chemistry, Medical Technology, and Physics, Monmouth University, West Long Branch, NJ 07764

Cover
June 2002
Vol. 79 No. 6
p. 707
Abstract
A number of modifications to the standard keto–enol experiment in the physical chemistry laboratory are suggested for using modern NMR instruments now available in many chemistry departments. These modifications include sample preparation using a deuterated solvent for FT–NMR frequency locking, in-depth analysis of a proton spectrum acquired with a medium field (~300 MHz) NMR, examination of the temperature dependence of equilibrium processes, and multinuclear investigations. Remote access to the instrument and subsequent data analysis facilitated by the Internet are discussed. These methods permit students to learn about a wide variety of concepts within an integrated single-experiment design. We include student data in our analysis and an overview of possible extensions to the experiment.
Supplement
A table of integrated intensities as a function of temperature is available.
*  Contents JCE2002p0707W.xls (Microsoft Excel)
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More Information
*  Citation
 Grushow, Alexander; Zielinski, Theresa Julia. J. Chem. Educ. 2002 79 707.
*  Keywords
 Equilibrium; NMR Spectrometry; Physical Chemistry; Solutions / Solvents; Thermodynamics
*  History
 Created:
Last Updated:		 May 17, 2002
March 16, 2005
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