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 Any of a class of organic compounds containing a six-member ring in which one of the carbon atoms has been replaced by a nitrogen atom.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

Despite many efforts, most studies have reported photocycloadditions happening on quinoline's benzene ring side, while few have targeted the pyridine side.

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

“We just could not find evidence for high levels of pyridine in the coastal sea water,” said Lancaster University environmental chemist Crispin Halsall, who worked on the report.

From Seattle Times • Jan. 20, 2023

Prof. Filehne, of Erlangen, who has studied a large number of these pyridine and quinoline derivatives, found, moreover, that the hydrochlorate of ethyl-piperidine had a physiological action quite analogous to that of conine.

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