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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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.

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.
References in periodicals archive ?
Nitrogen from furans containing urea evolves more rapidly, or in a different form, than nitrogen from urethanes.
A further regulation under the Environmental Protection Act will require mills to immediately cease buying defoamers and woodchips that cause dioxins and furans to be formed.
These are: phenol formaldehyde, phenolic urethane, furan hotbox, furan nobake, phenolic ester, core oil, phenolic isocyanate, alkyd isocyanate and furan warmbox.
Dioxins and furans are organochlorines, a large family of chemicals produced in the chlorine bleaching process used in pulp and paper mills to break down wood fibre and brighten paper.
Furans offer an instructive contrast, since they are available as nobake, cold, warm and hotbox systems.
These chemicals, which include butadiene, beryllium oxide, furans, sodium chromate, and dibutyl phthalate, are widely used industrially in such items as paints, varnishes, printing inks, and adhesives.
In Taiwan, a 1979 industrial accident known as Yu Cheng contaminated rice oil with huge quantities of polychlorinated biphenyls (PCBs) and furans.