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Chapter 11: Application of 13C-13C Spin-Spin Couplings in Structural Studies

Jese Leos
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Published in High Resolution NMR Spectroscopy: Chapter 11 Application Of 13C 13C Spin Spin Couplings In Structural Studies On Organic Compounds (Science And Technology Matter Biological Systems 3)
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Application Of 13C 13C Spin Spin Couplings In Structural Studies High Resolution NMR Spectroscopy: Chapter 11 Application Of 13C 13C Spin Spin Couplings In Structural Studies On Organic Compounds (Science And Technology Matter Biological Systems 3)

Structural studies play a crucial role in understanding the properties and behavior of molecules. They provide insights into the arrangement of atoms and bonds within a molecule, which aids in predicting its chemical and physical properties. Over the years, several techniques have been developed for studying molecular structures, and one such technique is the analysis of 13C-13C spin-spin couplings.

Understanding Spin-Spin Couplings

Spin-spin coupling occurs when two or more nuclear spins interact with each other, resulting in a splitting of the nuclear magnetic resonance (NMR) signals. This phenomenon provides valuable information about the spatial proximity of the interacting atoms. In the context of carbon-13 (^13C) NMR spectroscopy, spin-spin couplings between ^13C nuclei can be used to determine the connectivity of carbon atoms in a molecule.

High Resolution NMR Spectroscopy: Chapter 11. Application of 13C–13C Spin–Spin Couplings in Structural Studies on Organic Compounds (Science and Technology ... Matter & Biological Systems Book 3)
by Andrew Brown (Kindle Edition)

5 out of 5

Language : English
File size : 6264 KB
Text-to-Speech : Enabled
Enhanced typesetting : Enabled
Print length : 123 pages
Screen Reader : Supported

Application in Structural Studies

The application of 13C-13C spin-spin couplings in structural studies has revolutionized the field of organic chemistry. It allows for the determination of long-range carbon-carbon connectivity, which is essential in solving complex molecular structures.

Determining Carbon Connectivity

By measuring the magnitude and pattern of the spin-spin couplings, researchers can determine the connectivity between different carbon atoms in a molecule. This information helps in elucidating the carbon framework and understanding the overall structure.

Resolving Stereochemistry

The study of 13C-13C spin-spin couplings also aids in resolving stereochemistry, which refers to the three-dimensional arrangement of atoms in a molecule. The presence of spin-spin couplings between stereocenters provides valuable information about their relative orientations, allowing researchers to determine the correct spatial arrangement of atoms in a molecule.

Probing Conformational Dynamics

Spin-spin couplings can provide insights into the conformational dynamics of molecules. By analyzing the variation in coupling constants with temperature or in different solvents, researchers can gain information about the flexibility and motion of different parts of a molecule.

Experimental Techniques

The analysis of 13C-13C spin-spin couplings requires advanced experimental techniques and sophisticated data interpretation methods. Researchers employ a variety of approaches such as COSY (COrrelation SpectroscopY), HMBC (Heteronuclear Multiple Bond Correlation), and INADEQUATE (INAdequate Double Quantum Transfer Experiment) to extract valuable structural information.

The application of 13C-13C spin-spin couplings in structural studies has significantly contributed to our understanding of molecular structures. It offers a unique perspective on carbon connectivity, stereochemistry, and conformational dynamics, enabling researchers to solve complex structural problems. As technology continues to advance, we can expect further developments in this field, leading to new insights and discoveries.

High Resolution NMR Spectroscopy: Chapter 11. Application of 13C–13C Spin–Spin Couplings in Structural Studies on Organic Compounds (Science and Technology ... Matter & Biological Systems Book 3)
by Andrew Brown (Kindle Edition)

5 out of 5

Language : English
File size : 6264 KB
Text-to-Speech : Enabled
Enhanced typesetting : Enabled
Print length : 123 pages
Screen Reader : Supported

This chapter is devoted to the 1–3JCCs and to the factors influencing their magnitude. The experimental and calculated J data presented in the subsequent parts of the chapter are arranged with the thought of showing how hybridization, substituent electronegativity, the complex and hydrogen bond formation, and geometry of the compound bear on the JCC magnitude and which range of changes can be expected for a given type of coupling when all these effects are taken into account. The subsequent sections are devoted to the couplings across single, double, and triple CC bonds and to the couplings in aromatic and heteroaromatic systems and in the compounds of biological importance. It is also shown that at the present level of theory, it is possible in many cases to reproduce the experimental J values very exactly, achieving one-to-one correspondence.

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