What question did this study set out to answer?

The primary aim is to accurately assign all proton and carbon signals for (+)-catechin using NMR.

March 28, 2026

Complete Proton and Carbon Assignment of (+)-Catechin via One- and Two-Dimensional Nuclear Magnetic Resonance (NMR) Analysis

Key Points

The primary aim is to accurately assign all proton and carbon signals for (+)-catechin using NMR.
Students analyzed 1-D and 2-D NMR spectral data at 400 MHz.
Guided assignment of proton and carbon signals via various NMR techniques.
Comparison of coupling constants to theoretical values using the Karplus equation.
Utilized molecular modeling to ascertain vicinal angles of catechin.
All proton and carbon signals for (+)-catechin were successfully assigned.
Coupling constants for aliphatic regions matched theoretical predictions.
Carbon-13 signals aligned with calculated values from spectroscopic references.

Abstract

Students from an upper-division undergraduate organic class analyzed one- and two-dimensional 400-MHz NMR spectral data from (+)-catechin hydrate in acetone-d6. Guided assignment of all proton and carbon signals was completed via 1-D proton and carbon, nuclear Overhauser effect (nOe), distorsionless enhancement by polarization transfer (DEPT) 135, 1H–1H correlation spectroscopy (COSY), 1H–13C heteronuclear single quantum coherence (HSQC), and 1H–13C heteronuclear multiple bond coherence (HMBC) NMR experiments. Coupling constants for the aliphatic region were compared to the theoretical values as determined by the Karplus equation and vicinal angles as ascertained by molecular modeling of (+)-catechin. Carbon-13 signals for the aromatic and aliphatic regions were compared to calculated values obtained from both spectroscopic analyses books and computer software.

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Cite This Study

Chou et al. (Tue,) studied this question.

synapsesocial.com/papers/69c76fff8bbfbc51511e04f5 https://doi.org/https://doi.org/10.1333/s00897050978a

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