Opportunities and Challenges in Applying Solid-State NMR Spectroscopy in Organic Mechanochemistry

In recent years it was shown that mechanochemical strategies can be beneficial in directed conversions of organic compounds. Finding new reactions proved difficult, and due to the lack of mechanistic understanding of mechanochemical reaction events, respective efforts have mostly remained empirical....

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Bibliographic Details
Published in:ChemRxiv 2023-05
Main Authors: d'Anciães Almeida Silva, Igor, Bartalucci, Ettore, Bolm, Carsten, Wiegand, Thomas
Format: Article
Language:English
Subjects:
Chemistry
Crystal structure
Crystallography
Materials Chemistry
NMR
NMR spectroscopy
Nuclear magnetic resonance
Organic Chemistry
Organic compounds
Organic Compounds and Functional Groups
Organic Synthesis and Reactions
Physical Chemistry
Reaction products
Solid state
Spectroscopy (Physical Chem.)
Spectrum analysis
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Summary:In recent years it was shown that mechanochemical strategies can be beneficial in directed conversions of organic compounds. Finding new reactions proved difficult, and due to the lack of mechanistic understanding of mechanochemical reaction events, respective efforts have mostly remained empirical. Spectroscopic techniques are crucial in shedding light on these questions. In this overview, we discuss the opportunities and challenges of solid-state nuclear magnetic resonance (NMR) spectroscopy in the field of organic mechanochemistry. After a brief discussion of the basics of high-resolution solid-state NMR under magic-angle spinning (MAS) conditions, we present seven opportunities for solid-state NMR in the field of organic mechanochemistry, ranging from ex-situ approaches to structurally elucidate reaction products obtained by milling to the potential and limitations of in-situ solid-state NMR approaches. Particular strengths of solid-state NMR, for instance in differentiating polymorphs, in NMR-crystallographic structure-determination protocols, or in detecting weak noncovalent interactions in molecular-recognition events employing proton-detected solid-state NMR experiments at fast MAS frequencies, are discussed.
ISSN:2573-2293
DOI:10.26434/chemrxiv-2023-hmthq