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Pyridine is used in spectrophotometry and environmental testing.
Baumann, M.; Baxendale I. R.An overview of the synthetic routes to the best selling drugs containing 6-membered heterocycles.Beilstein J. Org. Chem. 2013, 9, 2265-2319.
Bull, J. A.; Mousseau, J. J.; Pelletier, G.; Charette, A. B.Synthesis of pyridine and dihydropyridine derivatives by regio- and stereoselective addition to N-activated pyridines. Chem. Rev. 2012, 112 (5), 2642-2713.
Widely used as a base and nucleophilic catalyst in acylations, sulfonylations, etc. See also 4-(Dimethylamino)pyridine, A13016.
Reacts with thionyl chloride to give N-(4-pyridyl)pyridinium chloride hydrochloride, a useful intermediate for the preparation of 4-substituted pyridines by nucleophilic displacement. Thus, reaction with sulfite ion gives the sulfonate: Org. Synth. Coll., 5, 977 (1973). Similarly, pyridine can be activated to substitution at the 4-position by reaction with Ethyl chloroformate, L06311, or tert-Butyldimethylsilyl trifluoromethanesulfonate, A12174. The acyl or silyl pyridinium salt then reacts with Grignards or organocuprates, to give 4-substituted dihydropyridines which can readily be rearomatized: Bull. Chem. Soc. Jpn., 57, 1994 (1984).
For use in Cr(VI) oxidation reactions, see Chromium(VI) oxide, 12522.
危险说明（欧盟）:H225-H302+H312+H332-H315-H319
Highly flammable liquid and vapour. Harmful if swallowed. Harmful in contact with skin. Harmful if inhaled. Causes skin irritation. Causes serious eye irritation.
防范说明:P233-P241-P242-P261-P264b-P270-P271-P280-P304+P340-P305+P351+P338-P312-P330-P363-P370+P378r-P403+P235-P501c
Keep container tightly closed. Use explosion-proof electrical/ventilating/lighting/ equipment. Use only non-sparking tools. Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. Rinse mouth. Wash contaminated clothing before reuse. In case of fire: Store in a well-ventilated place. Keep cool. Dispose of contents/ container to an approved waste disposal plant
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