Thin-film polyamide composite membrane (TFC) is a good representative model of highly permeable membrane. SEM analysis showed that TFC membrane structure is swelled by hexane vapors. Contrary, its porous structure collapsed when the used membrane is stored at dry conditions. The aging of membran...

Polyhalogenated carbazoles (PHCZs) are a class of halogenated dibenzopyrrole, which have been increasingly detected in the environment and found to be bioaccumulative and potentially toxic. However, their environmental transformation potential is largely unknown. In this study, UV absorption spe...

Experimental measurements of isobaric vapour, liquid equilibrium boiling point temperature were determined at 101.3 kPa as function of concentration for the two mixtures of hexane with orthoxylene, metaxylene and nonane with hexane by using a continuous recirculation type apparatus. The measured...

We have constructed a high-pressure fast-pulse dosing system for use with Scanning Tunneling Microscopy (STM). For 1-bromopentane on Si(1 1 1)-7 × 7 at low temperature (100 K) two physisorbed phases were found to co-exist; spaced-out molecules above corner silicon-adatoms in a one-per-corner-ho...

The neutron inelastic spectra of solid 1,4-dibromobutane and 1,5-dibromopentane have been taken at several temperatures. The observed neutron spectra are assigned to the skeletal bending and torsion modes on the basis of normal coordinate calculations, in which only intramolecular valence force ...

Meso and racemic 1,4-dihydroxy-2,3-dibromobutane reduce polarographically, with half-wave potentials which differ by 0.2 V. Meso and racemic 1,4-dinitroxy-2,3-di-bromobutane also give waves for bromine reduction which differ by 0.3 V, as well as waves for nitroxy ester reduction ; at low pH, the...

The reaction of 3-methyl-2-cyclohexen-1-one with 2-(S)-methoxy-1,4-dibromobutane (2) produced spiro[4.5]decanone 3, a key intermediate for the synthesis of spirovetivanes, with regiodifferentiation and stereoselection. Subsequent addition of diisopropoxydimethyltitanium to the carbonyl group fur...

The kinetics of cycloalkylation of phenylacetonitrile (PAN) with an excess of 1,4-dibromobutane has been studied under phase transfer catalysis (PTC) conditions using aqueous sodium hydroxide as the base and 2-benzilidine-N,N,N,N′,N′,N′-hexaethylpropane-1,3-diammonium dibromide (Dq-Br) as a n...

The borane and tribromoborane adducts of 2-bromopyridine, 2-chloropyridine, 2-fluoropyridine, and 2-cyanopyridine were successfully prepared, except in the case of the reaction between BBr3 and 2-cyanopyridine in which an insertion reaction gave bromo-(2-pyridyl)methylideneaminodibromoborane. Th...

Pyridine borane has been reported as a superior reagent over a wide pH range, 5–9, for the reductive methylation of amino groups of proteins with formaldehyde [J. C. Cabacungan, A. I. Ahmed, and R. E. Feeney (1982)Anal. Biochem., 124, 272–278]. It has also been reported to reduce tryptophan to...

The 1H and 11B spectra of a series of pyridine- and substituted pyridine-borane and phenylborane (Py, BH3 and Py, PhBH2) complexes have been measured. The 14N chemical shifts of pyridine, 2-, 3- and 4-methyl and 4-ethyl-pyridines and the borane complexes and the hydrochlorides have also been det...

Carbon materials of boron content ranging from 0.6 to 4 wt.% were synthesized by co-pyrolysis of QI-free coal–tar pitch with the borane–pyridine complex. The growing amount of boron introduced into the carbonaceous material is associated with an increase in nitrogen content and a progressive d...

The synthesis of a boron-substituted polyaromatic mesophase was studied by copyrolysis of a filtered coal tar pitch with pyridine-borane under a 1 MPa argon atmosphere. The pyrolysis temperature was varied between 360 and 420 °C, the boron content of the pitch-pyridine-borane mixture was increa...

The reaction of excess NaBH4 with N-(o-hydrazonylpyridine)ferrocenylimine (L) in a THF/water mixture yields the borane adduct, LBH3, which has been characterised by IR and NMR spectroscopy. The single-crystal X-ray determination shows that the pyridine nitrogen of L is coordinated to the BH3 uni...

Synthesis of boron-doped mesophase by controlled co-pyrolysis of an aromatic petroleum residue and a pyridine–borane complex, PB, as a boron source, was carried out. Pyrolysis was performed at temperatures ranging from 400 to 440 °C, under 1 MPa nitrogen atmosphere. Soaking time was varied bet...

In this note, we describe a method devised to detect, by means of mass spectrometry (MS), tryptophan-containing peptides and proteins using pyridine–borane. This reagent selectively reduces tryptophan residues, converting them to 2,3-dihydro-tryptophan, thereby enabling quantitation of tryptophans.

Mesophase pitches were prepared by adding 0.5 to 2 wt.% of a borane–pyridine complex to a decant oil in a tubing bomb reactor and heating in a fluidized-sand bath held at 500 °C for 30, 45, and 60 min, respectively. The mesophase pitches were analyzed using thermal gravimetric analysis, X-ray ...

Palladium (6–180 nmol) is extracted quantitatively with potassium n-butyl-xanthate into benzene from an aqueous phase containing EDTA, and determined spectrophotometrically at 290 nm. The molar absorptivity of the complex is 7.5 × 104 dm3 mol-1 cm-1.

Reaction between aluminium 2-methoxyethoxide and 2,2′-anhydro-1-β-d-arabinofuranosyluracil 6 gives 2′-O-(2-methoxyethyl)uridine 9 in high yield. Compound 9 is converted into 2′-O-(2-methoxyethyl)cytidine 11 in good yield.

Cisplatin is an important chemotherapeutic agent against metastatic bladder cancer, but resistance often limits its usage. With the recent recognition of lipid metabolic alterations in bladder cancers, we studied the metabolic implications of cisplatin resistance using cisplatin-sensitive (T24S)...