August 2017- Ashland has stopped production of 1.4 butanediol and tetrahydrofuran
(THF) in Europe after the fire incidence took place at its manufacturing facility at Marl, Germany.
Huang, "Excess molar volumes and surface tensions of trimethylbenzene with tetrahydrofuran
, tetrachloromethane and dimethyl sulfoxide at 298.15 K," Journal of Chemical & Engineering Data, vol.
Furans and tetrahydrofurans
have been widely researched on internal combustion engines.
Petschek, "Static and dynamic properties of polystyrene in good solvents: ethylbenzene and tetrahydrofuran
," Macromolecules, vol.
To a solution of 2,5-dibromo-3,4-dihexylthiophene (523.4 mg, 1.27 mmol, 1 equiv.) and 2-tributylstannylthiophene (1.18 g, 3.17 mmol, 2.5 equiv.) in degassed tetrahydrofuran
(8.5 mL), under a flow of nitrogen, [Pd[Cl.sub.2][(P[Ph.sub.3]).sub.2]] (71 mg, 8 mol %) and KF (581 mg, 10 mmol, 7.9 equiv.) were added.
Methyl benzoate (Fluka AG >0.996), tetrahydrofuran
, 1,4-dioxane, anisole, and butyl vinyl ether (all Sigma-Aldrich, AR grade) of mass purity >0.997 were used without further purification.
Commercially available starting materials were purchased from suppliers and used without furher purifications as follows: diammonium hydrogen phosphate [(N[H.sub.4]).sub.2]HP[O.sub.4]) (Merck supply), calcium nitrate tetrahydrate [(Ca(N[O.sub.3]).sub.2] x 4[H.sub.2]O) (Stem-Supply), ammonia solution (NH4OH) (Sigma-Aldrich), tetrahydrofuran
(THF) (SigmaAldrich) and absolute (anhydrous) ethanol (SigmaAldrich).
Without separation the mixture of 4a and 4b were dissolved in tetrahydrofuran
(THF) along with 3 M aqueous HC1 and stirred at ambient temperature for 24 hours.
The third part deals with eight groups of flavouring agents such as pyridine, pyrrole and qunoline derivatives; aliphatic and alicyclic hydrocarbons; aliphatic, linear, unsaturated aldehydes, acids and related alcohols, acetals and related esters; monocyclic and bicyclic secondary alcohols, ketones and related esters; amino acid and related substances; tetrahydrofuran
and furanone derivateives and Phenyl substituted aliphatic alcohols and related aldehydes and esters.
There are many agents that could be used to reduce the [Cu.sup.II], including sodium sulfite, sodium hydrogen sulfite, inorganic salts comprising a metal ion, hydrazine hydrate, mercaptoethanol, tetrahydrofuran
, dihydroanthracene, 2,3-dimethylbutadiene, silane compounds, borane compounds, aldehydes, and derivatives of such compounds.
Industrial polyether polyols are generally limited in monomer composition to propylene oxide, ethylene oxide, butylene oxide, and tetrahydrofuran
, while industrial polyester polyols, many of which are the condensation products of organic acids and alcohols, may be prepared by a great many more combinations of monomers, and therefore add to the potential versatility of polyure thane products.(7)
The unit addresses the needs of laboratory personnel who utilize THF (tetrahydrofuran
) as a mobile phase component in chromatographic separations and sample analyses.