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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)

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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...
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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...
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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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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.
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Ultra-selective 1D clean in-phase correlation spectroscopy.

Daniel A Taylor1, Peter Kiraly2, Paul Bowyer3

  • 1Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK. ralph.adams@manchester.ac.uk.

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|May 16, 2023
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Summary
This summary is machine-generated.

This study introduces ultra-selective GEMSTONE excitation with CLIP-COSY for nuclear magnetic resonance (NMR) spectroscopy. The method accurately identifies coupled spins in overlapping signals, improving molecular structure elucidation.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Organic Chemistry
  • Structural Biology

Background:

  • Selective 1D COSY is valuable for identifying coupled spins in molecules.
  • However, traditional methods suffer from poor selectivity and unfavorable multiplet lineshapes.
  • This limits their application, especially for complex molecules with overlapping signals.

Purpose of the Study:

  • To develop a more selective and robust NMR technique for through-bond correlation spectroscopy.
  • To overcome limitations of existing methods in resolving overlapping NMR signals.
  • To demonstrate the utility of the new technique on complex natural products.

Main Methods:

  • Utilized ultra-selective GEMSTONE excitation.
  • Combined with Chemical-Information-Processing-by-Correlation-spectroscopy (CLIP-COSY).
  • Applied to analyze lasalocid and cyclosporin.

Main Results:

  • Achieved unambiguous identification of coupled spins even with overlapping NMR signals.
  • Demonstrated superior selectivity and improved lineshape compared to conventional methods.
  • Successfully elucidated structural information for lasalocid and cyclosporin.

Conclusions:

  • The GEMSTONE-CLIP-COSY method offers a powerful advancement in NMR spectroscopy.
  • It enables precise structural analysis of complex molecules with overlapping resonances.
  • This technique has broad applicability in chemistry and drug discovery.