Related Experiment Video
Updated: Jun 22, 2026

Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications
Published on: December 22, 2023
Structure elucidation and NMR assignments for curcuminoids from the rhizomes of Curcuma longa
Wei Li1, Shisheng Wang, Jiatao Feng
1Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Abstract:
Thirteen curcuminoids (1-13) were isolated from the rhizomes of Curcuma longa. Among them, 1,5-dihydroxy-1,7-bis(4-hydroxyphenyl)-4,6-heptadiene-3-one (1), 1,5-dihydroxy-1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)-4,6-heptadiene-3-one (2), 1,5-dihydroxy-1-(4-hydroxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-4,6-heptadiene-3-one (3), and 3-hydroxy-1,7-bis-(4-hydroxyphenyl)-6-heptene-1,5-dione (4) are new compounds, and 1-(4-hydroxyphenyl)-7-(3, 4-dihydroxyphenyl)-1, 6-heptadiene-3, 5-dione (5) is isolated from natural sources for the first time. The structures of these compounds were elucidated by extensive spectroscopic analyses, especially 1D and 2D NMR spectroscopy. The (13)C NMR data and complete (1)H and (13)C NMR assignments of some known compounds are reported for the first time. In addition, the errors of (1)H and (13)C assignments reported in the literature were corrected.
More Related Videos
Related Concept Videos
Prochirality
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
NMR Spectroscopy of Aromatic Compounds
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Naming Enantiomers

