A broad set of structurally different carboxylic acids were transformed into their trimethylsilyl esters with HMDS in a practically completely solvent-free process, while a catalytic amount of iodine was required in some cases. The process has several advantages over the known methods: untreated...

Methyl 2-((3,5-di-tert-butyl-4-hydroxybenzyl)thio) nicotinate was successfully synthesized from 2-mercaptonicotinic acid and 2,6-di-tert-butyl-4-hydroxy-benzylalcohol. Hydrazination of the esters is a conventional method for preparing acyl hydrazides, 2-(3,5-di-tert-butyl-4-hydroxy-benzylsulfany...

L-threo-2,3-Hexodiulosono-1,4-lactone 2-phenylhydrazone(1) reacted with hydroxylamine to give the 3-oxime 2-phenylhydrazone(2). On boiling with acetic anhydride,2 was dehydrated to 4-[L-threo-2,3-diacetoxy-(1-hydroxypropyl)]-2-phenyl-1,2,3-triazole-5-car☐ylic acid lactone(3), which was converted...

Reaction of hydroxylamine with d-erythro-2,3-hexodiulosono-1, 4-lactone 2-(phenylhydrazone) (2) gave the 3-oxime 2-(phenylhydrazone) (3). On boiling with acetic anhydride, 3 gave 4-(d-erythro-2,3-diacetoxy-l-hydroxypropyl)-2-phenyl-1,2, 3-triazoIe-5-carboxylic acid 5,1′-lactone. Compound 3 was ...

Various analogs of (1-alkoxy-2,2,6,6-tetramethylpiperidin-4-yl)diazene (AZONOR), symmetric and asymmetric (1,2,2,6,6 pentamethylpiperidin-4-yl)diazene flame retardants such as (N-t-butyl-N′-1,2,2,6,6 pentamethylpiperidin-4-yl)diazene (1), (N-cyclohexyl-N′-1,2,2,6,6 pentamethylpiperidin-4-yl)di...

The core of present study was to determine potential role of Piriformospora indica, mutualistic Basidiomycete endosymbiont on co-cultivation with Centella asiatica (L.) Urb., a neutraceutical plant. The analysis of major secondary metabolite asiaticoside and differential expression of key genes ...

Solvent extraction separation of divalent cobalt and nickel from sulphate solutions was studied using OPPA dissolved in n-dodecane and the optimum conditions for separation of cobalt and nickel were determined. It was found that extraction of both the metal ions increases with increase in equili...

The synergistic extraction of uranium from phosphoric acid solutions with di-nonyl phenyl phosphoric acid (DNPPA) and bidentate n-octyl (phenyl)-N,N-di-isobutyl carbamoyl methyl phosphine oxide (CMPO) in n-dodecane has been investigated and effect of varying concentrations of phosphoric acid, ph...

Oxiranes (epoxides) and oxetanes having a carbonyl functional group are chemoselectively isomerized to different heterocyclic compounds via Lewis acid-promoted 1,6- and 1,7-intramolecular nucleophilic attacks of the carbonyl oxygen on the electron-deficient carbon neighboring the oxonium oxygen:...

Layer-by-Layer (LbL) deposition of multi-walled carbon nanotubes (MWCNT) was used to modify porous electrodes for vanadium redox flow batteries. Preliminary studies performed over glassy carbon (GC) electrodes showed that assemblies obtained with MWCNT displayed better mechanical stability than ...

The interaction of vanadium ions (V2+, V3+, VO2+ and VO2+) with counter ions in the condensed-phase vanadium redox flow battery (VRFB) system is investigated using force-field based molecular dynamics (MD), coupled with well-tempered metadynamics (WT-MetaD). In the conventional VRFB electrolyte,...

Vanadium (IV) bearing chloride solution with the Fe (II)/V (IV) mass ratio of 60 was prepared to simulate the acidic liquor by hydrochloric acid leaching of reduced vanadium-bearing titanomagnetite. Extractant of bis (2-ethylhexyl) phosphoric acid (D2EHPA) was used to extract vanadium from the s...

The acid-catalysed cyclisation of caryophyllene-type α-amino oximes results in the formation of new bridged heterocycles with the 5,6-dihydro-4H-[1,2]oxazine moiety.

The salt content has a significant effect on the hydration reactions of alkali-activated geopolymers, thereby influencing the curing effect. The main objective of this paper is to study the changes that occur in the mechanical properties of sulfate saline soil solidified with an alkali-activated...

Gas-phase data on conformational energies and structures in the molecules CH3CH2CXO (X=H, F, Cl and Br) are used to establish parameter values for the non-bonded interaction C(sp3) ⋯ O(carbonyl) within the Morse-potential formulation. The new parameter values are: R0 = 2.90 Å, Rm = 3.55 Å an...

Myeloid differentiation primary response protein 88 (MyD88), an essential adapter protein used by toll-like receptors (TLR), is a promising target molecule for the treatment of respiratory inflammatory diseases. Previous studies explored the activities of novel 2-amino-4-phenylthiazole analogue ...

Seven subsets of aromatic urea and amide analogues of N-phenyl-N′-(2-chloroethyl)ureas (CEU) have been synthesized by nucleophilic addition of 3-chloropropylisocyanate, 2-chloroacetylisocyanate, ethylisocyanate, 2-chloroacetyl chloride, 3-chloropropanoyl chloride, 4-chlorobutanoyl chloride, and...

Partially hydrogenated 2-amino[1,2,4]triazolo[1,5-a]pyrimidines and 2-amino[1,2,4]triazolo[5,1-b]quinazolines react with the chlorides of chloroacetic, 3-chloropropanoic, and 4-chlorobutanoic acids at 0–5 °C to give amides through acylation of the 2-amino group. Heating the corresponding 3-chl...

Primary straight-chain C1C12, C14, C16 and C18 alcohols and their propanoyl, 2-chloropropanoyl and 3-chloropropanoyl derivatives have been analysed by gas chromatography on SE-30 and OV-351 capillary columns. The separation of a mixture of 60 components was complete on SE-30, some overlapping ...

The retention behaviour of primary C1–C18n-alkanols and their propanoyl, 2-chloropropanoyl and 3-chloropropanoyl derivatives was examined isothermally on SE-30 and OV-351 capillary columns. Retention increments showing the effect of methylene substitution in the alkyl chains and of monochloro s...