furan


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furan:

see furfuralfurfural
or furfuraldehyde
[Lat.,=bran], C4H3OCHO, viscous, colorless liquid that has a pleasant aromatic odor; upon exposure to air it turns dark brown or black. It boils at about 160°C;.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Furan

 

(furfuran), a heterocyclic compound; a colorless liquid, with a chloroform odor and a boiling point of 31.33°C. A large group of organic compounds, many of which are of practical

value, are derived from furan, for example, furfural, tetrahydrofuran, and 2-methylfuran. Furan is obtained primarily from furfural. It is an intermediate product in the synthesis of tetrahydrofuran; it is also used in the preparation of pyrrole, by a reaction with NH3 in the presence of Al2O3.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

furan

[′fyu̇r‚an]
(organic chemistry)
One of a group of organic heterocyclic compounds containing a diunsaturated ring of four carbon atoms and one oxygen atom.
C4H4O4 The simplest furan type of molecule; a colorless, mildly toxic liquid, boiling at 32°C, insoluble in water, soluble in alcohol and ether; used as a chemical intermediate. Also known as furfuran; tetrol.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The formation of furan was correlated with the pH, sugar content, titratable acidity and ascorbic acid content of the produce.
The mixture of sand and furan binder, thus organically bonded moldings, gives way and forms surface cracks.
The UV spectra were monitored over a range of 450 to 200 nm, while the chromatograms were recorded at 273 nm to detect the furan ester derivative (1), and to detect malformins A (2) and C (3) the PAD detector was set at [lambda] = 203 nm.
As shown in Figure 9(a) and Figure 9(b), both furan and 25DHF ignition are greatly prohibited by hydrogenation reaction of furan+H=[C.sub.4][H.sub.5]O-3, which is the largest furan consumption reaction in laminar flames [13] and ignition behind shock waves [10].
When the pyrolysis was conducted over MCM-48 catalysts, however, the production of furans and aliphatic and aromatic hydrocarbons was enhanced considerably, whereas the fraction of phenolics decreased significantly.
Moreover, Table 2 shows that the 2s atomic orbital (AO) contribution of Y = O, in the O-C bond is more important in [X.sub.3]Al-furan (X = H, F, Cl and Br) complexes than that in isolated furan moiety.
Scientists led by Javier Santos, a professor at the Department of Analytical Chemistry at the University of Barcelona said in the journal <em>Food Chemistry</em> that higher concentrations of furans are found in espresso (43a[euro]146 nanograms per mililitre) than in coffee made in drip coffee makers, with normal coffee getting higher readings (20a[euro]78 ng/ml) than decaffeinated coffee (14a[euro]65 ng/ml).
Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), commonly referred to simply as dioxins and furans, are toxic chlorinated compounds that are usually released as mixtures into the environment.
The scientists analyzed furan from the irradiated samples using solid phase microextraction and gas chromatography-mass selective detection techniques.
A mixture solution of 11.0 g (0.1 mol) acetyl furan, 30 mL ethanol was placed into the flask; another 12.0 g isopropyl nitrite (0.2 mol) was added into the addition funnel keeping the reaction temperature at 15[degrees]C.