1) Alkali 2) Base 3) Simple aromatic ring
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1) Triphosphopyridine
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https://www.crosswordclues.com/clue/pyridine
Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group (=CH-) replaced by a nitrogen atom. The pyridine ring occurs in many important compounds, including azines and the vitamins niacin and pyridoxal. Pyridine was discovered in 1849 by the Scottish chemist Th...
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http://en.wikipedia.org/wiki/Pyridine
• (n.) A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mention...
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http://thinkexist.com/dictionary/meaning/pyridine/
any of a class of organic compounds of the aromatic heterocyclic series characterized by a six-membered ring structure composed of five carbon atoms ... [1 related articles]
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http://www.britannica.com/eb/a-z/p/137
C5H5N Molar mass: 79.0999
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A colorless heterocyclic aromatic base with an unpleasant smell, found in bone oil and coal tar. Pyridine is used as a solvent and to denature grain alcohol (ethanol. Important derivatives are pyridoxine and niacin (see vitamin B complex.
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<physiology> A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colourless liquid with a peculiar pungent odour. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may b...
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http://www.encyclo.co.uk/local/20973
(pir´ĭ-dēn) 1. a toxic, colorless, liquid hydrocarbon usually derived from coal tar and used as a laboratory and industrial intermediate.
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Pyr'i·dine noun [ From Greek ... fire.]
(Physiol. Chem.) A nitrogenous base, C
5 H
5 N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large numbe...
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http://www.encyclo.co.uk/webster/P/203
Type: Term Pronunciation: pir′i-dēn, -din Definitions: 1. A colorless volatile liquid of empyreumatic odor and burning taste, resulting from the dry distillation of organic matter containing nitrogen; used as an industrial solvent, in analytic chemistry, and for denaturing alcohol.
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http://www.medilexicon.com/medicaldictionary.php?t=74483
Pyridine is a basic compound occurring in coal tar and in the oil obtained by the distillation of bones. It is the parent substance of a large number of derivatives, including some of the natural alkaloids, such as nicotine and piperine. Pyridine is sometimes used for denaturing alcohol, so as to render it unfit to drink.
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[
n] - a toxic colorless flammable liquid organic base with a disagreeable odor
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http://www.webdictionary.co.uk/definition.php?query=pyridine
noun a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal
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https://www.encyclo.co.uk/local/20974
Heterocyclic compound (see cyclic compounds). It is a liquid with a sickly smell and occurs in coal tar. It is soluble in water, acts as a strong base, and is used as a solvent, mainly in the manufacture of plastics
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https://www.encyclo.co.uk/local/21221
a colorless, flammable, liquid organic base, CHN, having a disagreeable odor, usually obtained from coal or synthesized from acetaldehyde and ammonia: used chiefly as a solvent and in organic synthesis.
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https://www.infoplease.com/dictionary/pyridine
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