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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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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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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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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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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...
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Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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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...
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Implementing homo- and heterodecoupling in region-selective HSQMBC experiments.

Laura Castañar1, Josep Saurí1, Pau Nolis1

  • 1Servei de Ressonància Magnètica Nuclear and Departament de Química, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Catalonia), Spain.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 10, 2013
PubMed
Summary

A novel Nuclear Magnetic Resonance (NMR) method enhances sensitivity and resolution in spectral analysis. This technique simplifies complex spectra, improving data interpretation and enabling precise measurement of heteronuclear coupling constants.

Keywords:
Band-selective HSQMBCHomonuclear decouplingProton–carbon coupling constantsPure-shiftResolution enhancementSensitivity improvement

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Chemical Analysis
  • Spectroscopic Methods

Background:

  • Band-selective experiments are crucial for simplifying complex NMR spectra.
  • Long-range heteronuclear correlation spectra often suffer from low sensitivity and resolution.
  • Existing methods may not efficiently provide in-phase coherence for further processing.

Purpose of the Study:

  • To introduce a new NMR method for enhanced sensitivity and resolution in band-selective long-range heteronuclear correlation spectra.
  • To demonstrate the utility of the proposed experiment for simplifying spectral data.
  • To establish a novel approach for measuring heteronuclear coupling constants.

Main Methods:

  • Development and application of a band-selective heteronuclear single quantum multiple bond correlation (selHSQMBC) experiment.
  • Implementation of homonuclear and/or heteronuclear decoupling in the detected dimension.
  • Utilizing the in-phase nature of the selHSQMBC experiment for simplified cross-peak generation.

Main Results:

  • Achieved significant improvements in spectral resolution.
  • Maintained or enhanced the sensitivity of the NMR experiment.
  • Generated simplified cross-peaks, removing characteristic J multiplet structures.
  • Demonstrated the (1)H-homodecoupled band-selective (HOBS) HSQMBC experiment for measuring heteronuclear coupling constants from in-phase doublets.

Conclusions:

  • The proposed selHSQMBC experiment effectively enhances sensitivity and resolution in NMR spectral analysis.
  • The HOBS HSQMBC variant offers a new pathway for accurate heteronuclear coupling constant determination.
  • This method provides simplified spectral data, aiding in structural elucidation and analysis.