Pitch is the material remaining after the removal of pyridine and other distillates; it is useful in the aluminum industry for the manufacture of electrodes.
Vinylpyridines such as are important monomer building blocks for plastics, and fully saturated pyridine, piperidine, is used in rubber processing and as a chemical raw material.
Anhydrides also are produced when acyl halides react with acetic anhydride or with carboxylic acid and pyridine.
PCC is a complex of chromium trioxide (CrO3) with pyridine (C5H5N) and hydrogen chloride (HCl), written as pyridine ∙ CrO3 ∙ HCl.
One of the bases that is recovered is pyridine, a colourless nitrogenous liquid that has a pungent odour and produces derivatives that are of pharmaceutical value.
Diquat, paraquat, clopyralid, and diflufenican are well-known pyridine derivatives used as herbicides.
Pyridine-2-, -3-, and -4-carboxylic acids also have widely used trivial names: picolinic, nicotinic (derived from nicotine, of which it is an oxidation product), and isonicotinic acid, respectively.
Cationic organic molecules, such as certain aliphatic and aromatic amines, pyridines, and methylene blue, may replace inorganic exchangeable cations present in the interlayer of expansible minerals.
March 7, 1857 Dresden, Germany March 14 , 1935Dresden, Germany Arthur Rudolf Hantzsch, (born March 7 , 1857 Dresden, Saxony [Germany] died March 14 , 1935 Dresden), German chemist who won fame at the age of 25 for devising the synthesis of substituted pyridines.
Mono-, di-, and trimethylpyridines that is, pyridines with one, two, or three attached methyl groups, respectively are called picolines, lutidines, and collidines, respectively, with the position of the methyl groups denoted by numbers e.g., 2,4,6-collidine.
Pharmaceutically important pyridines include the tuberculostat isoniazid (isonicotinic acid hydrazide), the anti-AIDS-virus drug nevirapine, the vasodilator nicorandil, used for treating angina, the urinary-tract analgesic phenazopyridine, and the anti-inflammatory sulfa drug.
