pyridine

American  

[pir-i-deen, -din] / ˈpɪr ɪˌdin, -dɪn /

noun

Chemistry.

1. a colorless, flammable, liquid organic base, C 5 H 5 N, 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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pyridine British  

/ ˈpɪrɪˌdiːn /

noun

1. a colourless hygroscopic liquid with a characteristic odour. It is a basic heterocyclic compound containing one nitrogen atom and five carbon atoms in its molecules and is used as a solvent and in preparing other organic chemicals. Formula: C 5 H 5 N

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pyridine Scientific  

/ pĭr′ĭ-dēn′ /

1. Any of a class of organic compounds containing a six-member ring in which one of the carbon atoms has been replaced by a nitrogen atom. Pyridines include compounds used as water repellents, herbicides, and various drugs. The pyridine ring structure is also part of many larger compounds, including niacin and nicotine.

2. The simplest of these compounds, a flammable, colorless or yellowish liquid base having a penetrating odor. It is used as a solvent and waterproofing agent and in the manufacture of various drugs and vitamins. Chemical formula: C ₅ H ₅ N.

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Other Word Forms

• pyridic
  adjective

Etymology

Origin of pyridine

First recorded in 1850–55; pyr- + -id ³ + -ine ²

Example Sentences

The researchers discovered that this boron-containing compound was extremely effective at inducing dearomative photocycloaddition almost exclusively on the pyridine side of quinoline.

From Science Daily • Jun. 19, 2024

They consist of an electron-abundant benzene ring fused to an electron-deficient pyridine ring; these electronically distinct rings can be modified independently by adjusting reaction conditions.

From Science Daily • Jun. 19, 2024

Previous research, supported by the fishing industry, had suggested the deaths could have been due to the chemical pyridine, possibly from dredging in the mouth of the River Tees.

From BBC • Feb. 24, 2023

The group, chaired by Gideon Henderson, chief scientific adviser to the government’s environment department, said it was “very unlikely” that pyridine or another toxic pollutant caused the die-off.

From Seattle Times • Jan. 20, 2023

The study of the decomposition products of the cinchona alkaloids especially points quite distinctly to the probable existence in quinine of a hydrogen addition product of pyridine, in combination with a methyl-quinoline group.

From Scientific American Supplement, No. 415, December 15, 1883 by Various