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A rare example of extremely strong carbon—carbon coupling: Analysis of 13C and 1H NMR spectra of a 13C2-acetylenic ketone

✍ Scribed by Richard J. Auchus; André d'Avignon; Douglas F. Covey

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
270 KB
Volume
25
Category
Article
ISSN
0749-1581

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✦ Synopsis

NMR spectra are reported for an acetylenic ketone enriched with 13C in the acetylenic carbon atoms that exhibits extremely strong C-C coupling. Chemical shifts and coupling constants have been extracted from computer simulations of the second-order 'H and I3C spectra. The two acetylenic carbon atoms exhibit a Av/J ratio of 0.2. Owing to the strong coupling, the doublequantum coherence I3C spectrum requires an unusually long (58 ms) interpulse delay time in order to obtain a good spectrum. NMR spectra of this compound provide a unqiue example of strong coupling in a CCH (AB or ABX) spin system.

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