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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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.
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

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NMR assignment in regioisomeric hydroquinones.

Jose A Dobado1, José C Gómez-Tamayo, Francisco G Calvo-Flores

  • 1Grupo de Modelización y Diseño Molecular, Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain. dobado@ugr.es

Magnetic Resonance in Chemistry : MRC
|April 1, 2011
PubMed
Summary

Researchers synthesized tricyclic hydroquinone analogues of antitumor compounds. Specific derivatives revealed intramolecular hydrogen-bonded rings, confirmed by NMR spectroscopy and computational analysis.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Computational Chemistry

Background:

  • Tricyclic hydroquinones are structural analogues of known antitumor agents.
  • Understanding the structure-activity relationship of these compounds is crucial for drug development.

Purpose of the Study:

  • To synthesize regioisomeric pairs of tricyclic hydroquinones.
  • To elucidate the regiochemistry and structural features of these synthesized compounds.
  • To investigate the presence of intramolecular hydrogen bonding in specific derivatives.

Main Methods:

  • Synthesis of tricyclic hydroquinone derivatives.
  • Nuclear Magnetic Resonance (NMR) spectroscopy, including 1H-detected one-bond (C-H) HMQC and long-range C-H HMBC.
  • Theoretical calculations using O3LYP/Alhrichs-pVTZ.

Main Results:

  • Successful synthesis of regioisomeric pairs of tricyclic hydroquinones.
  • Assignment of regiochemistry and NMR spectra, showing good agreement with theoretical calculations.
  • Identification of a seven-membered intramolecular hydrogen-bonded ring in 5-hydroxymethyl derivatives (11, 15, 19) based on (3)J(H, H) coupling constants.
  • Absence of this hydrogen-bonded ring in the corresponding 8-hydroxymethyl isomers.

Conclusions:

  • The study successfully synthesized and characterized novel tricyclic hydroquinone analogues.
  • NMR and computational methods confirmed the structures and regiochemistry.
  • The presence of intramolecular hydrogen bonding in 5-hydroxymethyl derivatives is a key structural feature differentiating them from 8-hydroxymethyl isomers.