Interesting hydrogen-bonded supramolecular patterns have been achieved by hexafluorosilicate anion in the crystal structures of bis(thiabendazole) hexafluorosilicate dihydrate 1 and bis(pyrimethamine) hexafluorosilicate 2. In compound 1, the nitrogen atom of the benzimidazole ring rather than th...

Pyridinium hexafluorosilicates with the compositions (LH)2[SiF6] (where L = 2,6-bis(hydroxymethyl)pyridine (I), 4,5-bis(hydroxymethyl)-2-methylpyridine-3-ol (II)), monohydrate (LH)2[SiF6]·H2O (L = 2-bromo-6-methylpyridine (III)) and (LH2)[SiF6] (L = 4,4′-bipyridine (IV), 2,2′-bipyridine (V)) ...

Three pyridinium hexafluorosilicates with the compositions (LH)2[SiF6] (I, II, III, where L = 2-, 3-, 4-carboxymethylpyridine) were obtained as crystalline solids upon interaction of hexafluorosilicic acid with isomeric carboxymethylpyridines. All compounds were characterized by elemental analys...

A novel high-nuclearity silver(I) ethynide cluster complex, namely {SiF6@Ag24(CCtBu)20}·SiF6, has been isolated from the reaction between AgBF4 and tBuCCAg in a glass beaker. Single-crystal X-ray analysis showed that an in situ generated hexafluorosilicate template anion occupies the central ca...

Magnetic-phase and incident wavelength dependent light scattering result from each magnetic phase of EuTe and are analyzed in terms of one-spin, one-phonon mechanisms for spin-dependent Raman scattering and compared with shell model calculations to yield new information on the phonon dispersion ...

The reaction of 2,3-dimethylcyclohexan-1-one (2) with the functionalized allylic bromide 3 produced regio- and strereoselectively a precursor (4) of the new sesquiterpenoid sollasin a / fulvanin 1 (1). Functional group transformations then completed the synthesis.

Publisher SummaryThe two-step synthesis of 2-iminobiotin hydrobromide involves the alkaline hydrolysis of biotin with barium hydroxide to yield 5-(3,4-diaminothiophan-2-yl)pentanoic acid. The diaminocarboxylic acid sulfate (2.5 g) is treated with barium carbonate (5 g) and dissolved in 30 ml of ...

The absorption spectra of cupric ethylacetoacetate in the 200–1000 mμ range have been measured in a variety of solvents. Absorption bands of high intensity in the 200–300 mμ region are attributed to the conjugated system of the ligand. Absorption in the 300–1000 mμ region is shown to be re...

Metal exchange reactions of acetylacetonate complexes with Cd(II), Cu(II) and Zn(II) ions were investigated by using cadmium and copper ion selective electrodes. Changes in the electrode potential and pH of the solutions were monitored upon adding the pertinent metal Zn(II) of the acetylacetonat...

The rate of oxidation of α-methylstyrene catalyzed by cobaltous or manganous acetylacetonates was much higher than that catalyzed by cobaltous decanoate or cobalt phthalocyanine, and the reactions have shown excellent half order relations with respect to metal acetylacetonates over wide range o...

Cupric oxide–aluminum oxide (CuO–Al2O3) composites were prepared by co-precipitation of carbonates from aqueous solutions of metal nitrates followed by calcination. A novel palladium-oxide (Pd·Cu1+xAl2−xO4) composite has been synthesized by heating Pd (acetylacetonate)3 and CuO·Al2O3 in a mi...

AimTo study the chemical constituents of the stem of Dasymaschaon trichophorum Merr‥

SummaryAristolochic acid (AA) a naturally occuring nephrotoxin and carcinogen is implicated in a unique type of renal fibrosis, designated Chinese herbs nephropathy (CHN). We identified AA-specific DNA adducts in kidneys and in a ureter obtained from CHN patients after renal transplantation. AA ...

Phytochemical investigation on Aristolochia moupinensis and Aristolochia cathcartii resulted in the isolation of twelve aristolactam-type alkaloids and six aristolochic acid derivatives. Their structures were identified as aristololactam BII, 7-methoxyl-aristololactam IV, aristololactam IV, aris...

Phytochemical investigation on a crude methanolic bark extract of Goniothalamus velutinus resulted in the isolation of four compounds, aristolactam I (1), aristolactam BII (2), aristolactam AII (3) and velutinam (4). Compounds (1) and (2) have previously been isolated from the bark of G. velutin...

A new aromatic diacylhydrazide monomer viz., 4-[4′-(hydrazinocarbonyl)phenoxy]-2- pentadecylbenzohydrazide was synthesized starting from cardanol, which in turn is obtainable from cashew nut shell liquid – a renewable resource material. A series of new poly(amideimide)s containing flexibilizin...

A new aromatic diacid monomer viz., 4-(4′-carboxyphenoxy)-2-pentadecylbenzoic acid was synthesized starting from cardanol and was characterized by FTIR, 1H- and 13C NMR spectroscopy. A series of new aromatic polyamides containing ether linkages and pendant pentadecyl chains was prepared by phos...

Anacardic 6-pentadecyl salicylic acid (6SA) is the active component of Amphipterygium adstringens, a plant used in traditional medicine for the treatment of malaria and vascular diseases and as an anti-bacterial and immune-modulatory agent. However, the effect of 6SA on the immune system remains...

The AMP-activated protein kinase (AMPK) pathway has been shown to be able to regulate inflammation in several cell lines. We reported that fenoterol, a β2-adrenergic receptor (β2-AR) agonist, inhibited lipopolysaccharide (LPS)-induced AMPK activation and inflammatory cytokine production in THP...

Fenoterol and its derivatives are selective β2-adrenergic receptor (β2-AR) agonists whose stereoselective biological activities have been extensively investigated in the past decade; a complete stereochemical characterization of fenoterol derivatives is therefore crucial for a better understan...