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
Thermo-optical studies of solutions of asphaltenes in toluene and tetrahydrofurane
 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.
The nature of association in tetrahydrofurane
and diethyl ether solutions.
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
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
3-(tri-methoxysilylpropyl) methacrylate (TMSM) (Fluka, 98% purity) and tetrahydrofurane
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.