Application of 4556-23-4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Aerobic Cross-Dehydrogenative Coupling Reactions for Selective Mono- and Dithiolation of Phenols. Author is Han, Dong-Yang; Liu, Xiao-Peng; Li, Ruo-Pu; Xu, Da-Zhen.
A highly efficient strategy for the direct thiolation of phenols, e.g., 1-pyrenol under transition metal-free and solvent-free conditions has been developed. These reactions are operationally simple with employing air (mol. oxygen) as an ideal oxidant and can selectively provide mono- and dithiolation products, e.g., I in good to excellent yields under basic conditions. The reaction tolerates a broad range of aryl thiols RSH (R = Ph, 2-naphthyl, pyridin-4-yl, etc.) and arenes and is especially applicable for large-scale synthesis.
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Reference:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts