The present paper describes the characterization of Pakistan lignite coal, derived humic acids (HAL) and nitrohumic acids (NHA) along with the standard leonardite humic acids (LHA). The study utilized chromatographic and spectroscopic techniques to characterize the structure of coal and derived ...

A series of maleopimaric and quinopimaric acids’ derivatives modified in the E-ring, at the carbonyl- and carboxyl-groups were synthesized and evaluated for their activity in vitro against respiratory viruses (influenza; rhinovirus; adenovirus; and SARS), papilloma virus, and hepatitis B and C ...

Treatment of two equivalents of N,N′-bis(X-phenyl)oxamides (1) with one equivalent of [Zn(OAc)2(H2O)2] (2) in the presence of four equivalents of [nBu4N]OH produce the corresponding bis(N,N′-substituted oxamate) zincate(II) complexes with the general formula (nBu4N)2[Zn(X-phenyloxamide)2] (3) ...

The pKa value for 2,2-bis(4-dimethylaminophenyl)-1-nitro-1-(4-nitrophenyl)ethane, (dmap)2 (pKa = 25.11) has been measured spectrophotometrically using buffer solutions of a few strong amine bases: 1,8-diazabicyclo[5.4.0]undec-7-ene, (DBU); 1,1,3,3-tetramethylguanidine, (TMG); 1,5,7-triazabicyclo...

4-Nitrophenyl β-d-apiofuranoside as a chromogenic probe for detection of β-d-apiofuranosidase activity was prepared in 61% yield from 2,3-isopropylidene-α,β-d-apiofuranose through a sequence of five reactions. The synthesis involves one regioselective enzymatic step—benzoylation of primary ...

Publisher SummaryThe most common method used for purification of inorganic species is recrystallization. However, especially with salts of weak acids or of cations other than the alkaline and alkaline earth metals, care must be taken to minimize the effect of hydrolysis. This can be achieved, fo...

Publisher SummaryThis chapter deals with the purification of inorganic compounds and the purification of metal-organic compounds which includes ammonium and metal salts of organic acids. The most common method of purification of inorganic species is by recrystallization, usually from water. But,...

SummaryIn this study, several representative symmetric and non-symmetric naphthalenesulfonic acid derivatives belonging to various structural classes were evaluated for their potential to inhibit HIV-1 protease. The most active compounds were non-symmetrical and possessed hydrophobic pendant gro...

The kinetics of the allyl + HO2 bimolecular reaction, the thermal decomposition of C3H5OOH, and the unimolecular reactions of C3H5O are studied theoretically. High-level ab initio calculations of the C3H5OOH and C3H5O potential energy surfaces are coupled with RRKM master equation methods to com...

Allyloxy-N-(1-benzyl) cinchonidinium bromide was found to be an effective organocatalyst for asymmetric Michael reactions of thiols with various α,β-unsaturated ketones, acids and esters to provide optically active sulphides with high enantiomeric excess (91–100% ee) and chemical yields (up t...

The epoxidation of 1,4-bis(allyloxy)butane (DiBan) with hydrogen peroxide as an oxidant in the presence of o-phosphoric acid and sodium tungstate as an epoxidation catalyst was carried out in an organic solvent/aqueous solution two-phase medium. A few different phase-transfer catalysts were used...

The course of epoxidation of 1,4-bis(allyloxy)butane with hydrogen peroxide in the presence of H3PO4/Na2WO4·2H2O or heteropolyacids: H3PW12O40 and H3PMo12O40 as the catalysts and the ionic liquids as the phase transfer catalysts (cocatalysts) has been investigated. Imidazolium lactates and sali...

A new bis-allyloxy functionalized ATRP initiator, viz, 4,4-bis (4-(allyloxy) phenyl) pentyl-2-bromo-2-methylpropanoate was synthesized starting from commercially available 4,4-bis (4-hydroxyphenyl) pentanoic acid. Atom transfer radical polymerization of styrene in bulk and that of methyl methacr...

A novel benzoxazine monomer 3-(4-allyloxy)phenyl-3,4-dihydro-2H-6-(N-maleimido)-1,3-benzoxazine (AMB) was synthesized and structure was confirmed by FT-IR, 1H NMR. Thermal analysis (DSC) of AMB showed the introduction of allyloxy group decreased melting point and exhibited a narrow and symmetric...

2-Allyloxypyridinium triflate is formed in situ by treating a mixture of 2-allyloxypyridine, a carboxylic acid, and toluene with methyl triflate. Subsequent warming of the reaction mixture in the presence of potassium carbonate leads to efficient formation of allyl esters in good to excellent yi...

Three new metal-organic coordination polymers [Cd2L2] (1), [ZnL(H2O)]·H2O (2) and [Co3L2(μ3-OH)2(H2O)4] (3) were synthesized by the combination of the terephthalate derivative of 2,5-bis(allyloxy)terephthalic acid (H2L) and corresponding metal nodes. These compounds are constructed from the li...

The new β-diketonate complexes (hfac)2ZrCl2, (hfac)3ZrCl, hfac = hexafluoroacetylacetonate, and (thd)2ZrCl2, thd = 2,2,6,6-tetramethyl-3,5-heptanedionate, have been prepared in good yield by reacting the corresponding β-diketonate thallium complexes with ZrCl4 in stoichiometric amounts and the...

Selective area deposition of platinum suicide on exposed silicon areas of n-type, Si(100) substrates patterned with a polyimide resist has been demonstrated by using the thermal decomposition of the molecular precursor, Pt(PF3)4, under chemical beam conditions. Selectivity was studied as a funct...

Electron-beam-induced deposition (EBID) allows nano-scale three-dimensional rapid prototyping and is a promising nano-lithography alternative. One application is to write conductive lines at a position chosen by the scanning electron microscope (SEM) operator, for example to create contact elect...

The molecular structure of pentacarbonyl(trifluorophosphine)molybdenum, PF3Mo(CO)5, in the gas phase has been determined by the sector-microphotometer method of electron diffraction. The principal bond lengths and angles are: r(CO) 1.154±0.005, r(MoC) 2.063±0.006, r(MoP) 2.369±0.010, r(...