We are studying the NMR of a series of substituted cyclohexenecarboxylic acids. It was found that even though the overlapping of signals is minimal in the 1D NMR, it is difficult to assign the peaks on the cyclohexene ring. The 2D NMR of these compounds, including 1H-1H correlation spectroscopy (COSY) and 1H-13C heteronuclear multiple quantum coherence (HMQC) spectroscopy, helps a great deal with the signal assignment and structure elucidation. These spectra could serve as textbook-level materials for undergraduate chemistry students in advanced organic chemistry and spectroscopic analysis.

2D NMR study of the substituted cyclohexenecarboxylic acids

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