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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 It might be outdated or ideologically biased.



(also tetramethylene oxide or furanidine), a colorless liquid with an ether-like odor. Tetrahydrofuran is miscible with water and many organic solvents. It boils at 65.6°C and has a density of 0.889 g/cm3 at 20°C.

Tetrahydrofuran is obtained by the catalytic hydrogenation of furan. It is typically used as a solvent for polyvinyl chloride or to replace ethyl ether in the laboratory synthesis of organomagnesium compounds, particularly magnesium vinyl bromide. The products of the homopolymerization and copolymerization of tetrahydrofuran are used as starting materials in the manufacture of urethane rubbers.

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


(organic chemistry)
C4H8O A clear, colorless liquid with a boiling point of 66°C; soluble in water and organic solvents; used as a solvent for resins and in adhesives, printing inks, and polymerizations. Abbreviated THF.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
where [([V.sub.N]).sub.thf], [([V.sub.ch]).sub.ref] and [([V.sub.N]).sub.ref] denote the net retention volumes of tetrahydrofurane, chloroform, and n-alkane, respectively, which have the same selected property like boiling point.
First, oxidative hydroboration of separated exo-benzyllactol exo-7b, with the hydroborane tetrahydrofurane complex used, afforded a mixture of regio- and diasereoisomeric bicyclic alcohols exo-8b + exo-9b.
The average molecular weight (Mw) and polydispersity index ([M.sub.w]/[M.sub.n]) were estimated by gel permeation chromatography in tetrahydrofurane at 40[degrees]C.
Thermo-optical studies of solutions of asphaltenes in toluene and tetrahydrofurane [22] have shown that the solvent molecules can be trapped during aggregation of asphaltenes resulting in minimum diffusivities (D) before 50 mg/l and an increase in D at higher concentrations until a constant value is reached near 2000 mg/l.
At the first step, a mixture of conductive material consisting of 50 % (w/w) graphite, 35 % (w/w) epoxy and 15 % (w/w) hardener was prepared by dissolving in sufficient tetrahydrofurane (THF).
2,4-Dihydroxy benzaldehyde (DHB), 2-amino-3-methylpyridine (3-MAP), 2-amino-4-methylpyridine (4-MAP), 2-amino-6-methylpyridine (6-MAP), 2,4-toluene-diisocyanate (TDI), dimethylformamide (DMF), dimethylsulfoxide (DMSO), tetrahydrofurane (THF), methanol (MeOH), ethanol (EtOH), acetone, acetonitrile, toluene, ethyl acetate, CH[Cl.sub.3], C[Cl.sub.4] and n-hexane were supplied from Merck Chemical (Germany).
The liquid product (water + thermobitumen + oil) was extracted with hexane and tetrahydrofurane. The mass of the liquid product formed was found subtracting the mass of gas and dried solid residue from the initial mass of oil shale.
Stock solutions of DPH were prepared in tetrahydrofurane. For the measurements the membranes were diluted 4-fold with the incubation buffer in the presence of different concentrations of the detergents and the fluorescent polarization of DPH was determined at various temperatures with an LS50 spectrofluorometer (Perkin-Elmer Ltd., Beaconsfield, Buckinghamshire, England) using excitation and emission wavelengths of 360 and 430 nm, respectively.
Copolyoxadiazoles II were also soluble in less polar liquids, like pyridine or tetrahydrofurane (THF).
Solubility properties of the PCN films were investigated by immersing them into various solvents such as N-methyl-2-pyrrolidone (NMP), tetrahydrofurane (THF), dichloromethane (Me[Cl.sub.2]), and toluene for 1 week.