TY - JOUR
T1 - A rare example of extremely strong carbon—carbon coupling
T2 - Analysis of 13C and 1H NMR spectra of a 13C2‐acetylenic ketone
AU - Auchus, Richard J.
AU - d'Avignon, André
AU - Covey, Douglas F.
PY - 1987/5
Y1 - 1987/5
N2 - 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 1H and 13C spectra. The two acetylenic carbon atoms exhibit a Δ ν/J ratio of 0.2. Owing to the strong coupling, the double‐quantum coherence 13C 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.
AB - 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 1H and 13C spectra. The two acetylenic carbon atoms exhibit a Δ ν/J ratio of 0.2. Owing to the strong coupling, the double‐quantum coherence 13C 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.
KW - AB/ABX spin system
KW - INADEQUATE acetylenic ketones
KW - strong carbon‐carbon coupling
UR - http://www.scopus.com/inward/record.url?scp=84989629205&partnerID=8YFLogxK
U2 - 10.1002/mrc.1260250515
DO - 10.1002/mrc.1260250515
M3 - Article
AN - SCOPUS:84989629205
SN - 0749-1581
VL - 25
SP - 462
EP - 465
JO - Magnetic Resonance in Chemistry
JF - Magnetic Resonance in Chemistry
IS - 5
ER -