The quaternary carbon atoms of β-carotene can be conveniently assigned by heteronuclear correlation via the two-and three-bond couplings with the methyl protons.
J. Wernly and J. Lauterwein, J. Chem. Soc., Chem. Commun., 1985, 1221 DOI: 10.1039/C39850001221
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