Photoirradiation of tris(2-benzo[b]thienyl)methyl alcohol in acetonitrile afforded a cyclopentanone compound and a benzo[b]thiophene-condensed tropone derivative. The former is interpreted to originate via the di-π-methane rearrangement using the unsaturated bonds in two thiophene rings, while ...
Fengycin is a natural lipopeptide with antifungal and eliciting properties and able to inhibit the activity of phospholipase A2. A combination of CD, FT-IR, NMR and fluorescence spectroscopic techniques was applied to elucidate its conformation in a membrane-mimicking environment and to investig...
The needle-less electrospinning method was employed for a preparation of calcium phosphate (CP) and magnesium calcium phosphate (MgCP) fibers as biocompatible coatings on Ti substrate. The polyvinylalcohol, triethyl phosphite, calcium and magnesium nitrates were used for a preparation of spun so...
Metallic nanoparticles are major concern, particularly silver nanoparticles (AgNPs) are used in various applications. In the present investigation, we report a novel strategy with biological approach for synthesis of AgNPs using sodium para-hydroxybenzoate tetrahydrate (SPHT) isolated from Vitex...
A method for coulometric thermometric precipitation titrations of chloride, bromide and iodide in molten calcium nitrate tetrahydrate at 55° with coulometrically generated silver ions has been developed. The change in temperature during the titration is followed with the aid of a thermistor bri...
Calcium isocitrate tetrahydrate was characterised and found to be less soluble in water than calcium citrate tetrahydrate. The solubilities of both decrease with temperature, but increase with pressure. Calcium binds isocitrate with a constant of Ka = (6.80 ± 0.05) × 103 (ΔH° = −22.1 ± 2.6 ...
In the presence of hydrogen peroxide, a mononuclear copper(II) complex, [Cu(bdpg)Cl]Cl [where (bdpg) represents N,N-bis(2-pyridylmethyl)-β-alanine-amide] exhibits a much higher activity for the oxygenation of cyclohexane than other analogs. Crystal structure determinations and spectroscopic dat...
Pimprinine, an extracellular alkaloid has been isolated from the culture filtrate of Streptomyces CDRIL-312. Pimprinine was subsequently purified using silica gel column chromatography and also by preparatory thin layer chromatography. Some physicochemical properties, antimicrobial activities (i...
A simple and efficient synthetic protocol for 5-(3-indolyl)-oxazoles has been developed and further used to synthesize a series of novel analogues of natural product pimprinine. All new compounds were identified by 1H NMR, high resolution mass spectrometry, and the structures of 10 and 18o were ...
Silanes react with triphenylphosphine sulfide by a radical-chain mechanism to give the corresponding silanethiols in good yield. Silanethiols are similarly formed when silanes react with tert-dodecanethiol. Enantiomerically pure (S)-ButMePhSiH gave racemic silanethiol with Ph3PS, but with tert...
The α- and β-d-glucoseptanose pentaacetates have been prepared by treatment of ethyl 1-thio-β-d-glucoseptanoside tetraacetate with mercury(II) acetate in acetic acid. The solid state structure of the β-isomer has been determined by X-ray diffraction.
The preparation of one isomer of each of the 16 enantiomeric pairs of the aldohexofuranose pentaacetates is described together with 1H and 13C NMR data. Eight of the isomers have been obtained crystalline. Equilibrium values for the anomeric pairs have been determined.
Heterotopic ossification (HO) is a well-known complication of moderate and severe burn injuries. The development and progression of HO in burn patients are poorly understood phenomena at this time. Numerous measures aimed at preventing or minimizing HO have been described, but no definitive prop...
The advent of salicylates in the treatment of ulcerative colitis started in 1938 with the discovery of Salazopyrin by Nanna Svartz. This drug offered for the first time a therapeutic chance to patients with ulcerative colitis. In this paper we describe the fascinating history of Salazopyrin and ...
On the basis of classical Berthelot reaction, a simple salicylate-spectrophotometric method was developed for quantitative determination of inorganic monochloramine in water samples. With the catalysis of disodium pentacyanonitrosylferrate(III), inorganic monochloramine reacts with salicylate in...
The asymmetric desymmetrization of meso anhydrides through the addition of various nucleophiles is an important strategy in asymmetric synthesis. Resulting optically active multifunctional hemiesters are versatile chiral building blocks for many bioactive compounds as well as natural products.
Asymmetric CC bond formation was effected by the oxidative coupling of two different ester enolates using (R)-(+)-1,1′-bi(2-naphthol) as a common tether which served to link together both ester moieties in an asymmetric environment. Reduction of the corresponding succinates afforded diastereome...
The reduction of carboxylic acids and their derivatives represents one of the more fundamental transformations covered in undergraduate chemistry courses. As such the field is dominated by the classical hydride reductants that have been well understood for many decades. This chapter covers not o...
Oxidative homocoupling of titanium(IV) enolates of 2-isothiocyanato-carboxylic esters resulted in the synthesis of 2,3-diisothiocyanato-succinic acid diesters. The reactions were carried out using DIPEA/TiCl4 oxidizing system and led to chiral dimers (instead of meso) as main products. Titanium(...
The Sulfur (VI) Fluoride Exchange reaction (SuFEx) developed by Sharpless and co-workers in 2014, is a promising new click reaction that rests on the extraordinary elevated reactivity of sulfonyl fluorides and fluorosulfates with desired appropriate nucleophiles including silyl ethers and amines...
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