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2-Aminopyridine is an organic compound with the formula H 2 NC 5 H 4 N. It is one of three isomeric aminopyridines. It is a colourless solid that is used in the production of the drugs piroxicam, sulfapyridine, tenoxicam, and tripelennamine. It is produced by the reaction of sodium amide with pyridine, the Chichibabin reaction. [3]
2-Bromopyridine reacts with butyllithium to give 2-lithiopyridine, [2] which is a versatile reagent. [3] Pyrithione can be prepared in a two-step synthesis from 2-bromopyridine by oxidation to the N-oxide with a suitable peracid followed by substitution using either sodium dithionite or sodium sulfide with sodium hydroxide to introduce the thiol functional group.
The methylthio and amino pyridines were found to be formed in the same ratio. [4] In 1972 Kramer and Berry inferred the formation of 3,4-pyridyne in gas-phase photolysis of pyridine-3-diazonium-4-carboxylate via time-of-flight mass spectrometry. The dimer compound diazabiphenylene was detected. [5]
3-Bromopyridine is an aryl bromide and isomer of bromopyridine with the formula C 5 H 4 BrN. It is a colorless liquid that is mainly used as a building block in organic synthesis. [1] [2] It participates as a substrate in many reactions associated with aryl halides, e.g., the Heck reaction [3] and Buchwald-Hartwig coupling. [4]
Pyridine-borane (C 5 H 5 NBH 3, melting point 10–11 °C) is a mild reducing agent. structure of the Crabtree's catalyst. Transition metal pyridine complexes are numerous. [108] [109] Typical octahedral complexes have the stoichiometry MCl 2 (py) 4 and MCl 3 (py) 3. Octahedral homoleptic complexes of the type M(py) + 6 are rare or tend to ...
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3-Aminopyridine is prepared by heating nicotinamide with sodium hypobromite (Hofmann rearrangement), which is in turn prepared in situ by the reaction of sodium hydroxide and bromine at 70 °C. [2] It can be used in the synthesis of organic ligand 3-pyridylnicotinamide. Troxipide is another synthesis that uses 3-AP.
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