
TY  - JOUR
A1  - Jones, AJ 
A1  - Jenkins, GA 
A1  - Heffernan, ML 
T1  - Predicting non-first-order behaviour in fully coupled <sup>13</sup>C-<sup>1</sup>H spectra: a general rule
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1980
VL  - 33
IS  - 6
SP  - 1275
EP  - 1283
KW  - 
UR  - https://doi.org/10.1071/CH9801275 
N2  - The proton-coupled carbon-13 n.m.r. spectra in ABCDX, ABCX and ABX spin systems are shown to be non-first order when the condition 1JCH/2 = &#916;&#948; is met, where &#916;&#948; is the proton chemical shift separation between two closely coupled protons associated with adjacent carbon atoms. Solvent and temperature effects are shown to be useful in removing the spectral complexity and thus assist in complete analysis. Examples in heteroaromatic and hydrocarbon compounds are presented. For a chosen solvent system the non-first-order behaviour may be predicted from the 1H n.m.r. spectrum and used as an aid in 13C n.m.r. spectral assignment. 
ER  -

