The new methacrylic monomer, 3,5-dimethoxyphenyl methacrylate (DMOPM) was synthesized by reacting 3,5-dimethoxyphenol dissolved in ethyl methyl ketone (EMK) with methacryloyl chloride in presence of triethylamine as a catalyst. The homopolymer and copolymers of DMOPM with glycidyl methacrylate (...

Halogenation of 1-phenyl-3-(3,5-dimethoxyphenyl)-propane-1,3-dione (1) with N–X reagents take place regioselectively at the α position (except for fluorination), while halogenation of its BF2 derivative 3 take place regioselectively at position 2 in the activated phenyl ring. When the molar ra...

Three new hexafluoroacetylacetonate (hfa) chelates of cadmium having compositions, NH4Cd(hfa)3.H2O, Cd(hfa)2.NH3.H2O and Cd(hfa)2.2H2O have been synthesized. The syntheses, molecular weight, infra-red, NMR spectra and other properties of these chelates and of Zn(hfa)2.2H2O are discussed. A study...

The synergic solvent extraction of zinc(II), cadmium(II), and lead(II) with 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, H(HFA), and tri-n-butyl phosphate (TBP) or di-n-butylsulphoxide (DBSO) as neutral donors, into cyclohexane has been investigated. Quantitative extraction occurs at pH 4.5–6.0 in ...

Cadmium(II) dithiocarbamates [Cd(dtc)2] (d tc=4-carboxamidopiperidine-1-carbodithioate, morpholine-l-carbodithioate or 4-(2-hydroxyethyl)piperazine-1-carbodithioate) and [Cd(dtc)2]·H2O (dtc=4-hydroxypiperidine-1-carbodithioate} have been prepared and characterized by thermal analysis and IR and...

Two novel C29-5β-sterols, opuntisterol [(24R)-24-ethyl-5β-cholest-9-ene-6β,12α-diol] (1) and opuntisteroside [(24R)-24-ethyl-6β-[(β-d-glucopyranosyl)oxy]-5β-cholest-9-ene-12α-ol] (2), together with nine known compounds, β-sitosterol (3), taraxerol (4), friedelin (5), methyl linoleate (6...

F-ring opening in spirostanes with the 16β,22:22,25-diepoxy-23-acetoxymethyl-24-methyl side chain produces a Δ22-intermediate with an allylic acetoxy group. For this reason the reactivity profile of these compounds deviates from that observed in other naturally occurring or synthetic spirostan...

A series of novel N-substituted N′-(2-arylmethylthio-4-chloro-5-methylbenzenesulfonyl)guanidines 9–41 have been synthesized and investigated as inhibitors of four isoforms of zinc enzyme carbonic anhydrase (CA.EC 4.2.1.1), that is the cytosolic CA I and II, and cancer-associated isozymes CA IX...

A series of homoleptic copper(II) complexes (1a–8a) with N,N′,N″-trisubstituted guanidines, [Cu(II){PhCONHC(NHR)NPh}2] (where R = phenyl (1a), n-butyl (2a), sec-butyl (3a), cyclohexyl (4a), 1-naphthyl (5a), 2,4-dichlorophenyl (6a), 3,4-dichlorophenyl (7a), and 3,5-dichlorophenyl (8a)) have be...

Two aromatic guanidine derivatives, C6H5N = C(NHCy)2 (1), (n-TBA)C6H5NHC(NHCy)2Mo2O7 (2) (Cy = cyclohexyl), were synthetized with high yields. Both of them self-assembled into supramolecules via H-bond interactions. Single crystal XRD indicated that crystal 1 showed helix chains combining pseudo...

The mechanism and stereoselectivity of the asymmetric N-H insertion reactions between α-diazocarbonyl compounds and amines mediated by palladium-chiral guanidine complexes were investigated at the BP86-D3(BJ)/def2TZVP (SMD, CH2Cl2)//BP86-D3(BJ)/def2SVP (SMD, CH2Cl2) level at 303 K. The non-cata...

Corrosion is a major problem for high strength aluminium alloys. Thickening of the naturally formed oxide layer through anodizing is one of the main approaches to improve the corrosion resistance of these materials. Chromate anodizing is extremely efficient to produce anodized layers with good c...

In this study, we systematically investigated the oxidative degradation of 4-chlorophenol (4-CP) using nano zero valent iron (nZVI, Fe0) cooperated with citric acid (CA), and the role of CA as well as the mechanism of oxidation were deeply evaluated. 56.2% of 4-CP was removed after 60 min under ...

We report on the temperature sensing properties of varied praseodymium phosphate hosts MI(Na,Li,K)Pr(PO3)4 and PrP5O14. Details about fabrication, materials, and spectroscopic characterization are presented. The fluorescence properties of the praseodymium phosphates have been systematically inve...

An effective praseodymium oxysulfate/Ba0.5Sr0.5Co0.8Fe0.2O3-δ composite cathode with high stability in 10% CO2/air was investigated. The addition of 50 vol.% of the praseodymium oxysulfate shows much better tolerance to CO2, and reduced the polarization resistance of the cathode to 1/3 comparin...

The decomposition reactions of praseodymium hydroxy carbonate and praseodymium carbonate octahydrate have been followed by thermogravimetric analysis, X-ray diffraction analysis of quenched, equilibrated specimens, in situ high temperature X-ray diffraction analysis, and dynamic in situ high-res...

Herein, we report, for the first time, the fabrication and characterization of smoke sensors based on Brij 58 functionalized Praseodymium oxide (Pr6O11) nanostructures. Various Pr6O11 nanostructures such as nano-aggregates, spherical particles, nano-ellipsoids and nanoflowers were synthesized by...

This investigation focuses on the employment of the solution combustion route for synthesis of praseodymium oxide nanoparticles. The fabrication was be carried out by using the solution combustion of a fuel (urea) and oxidizer (praseodymium nitrate) mixture. The influence of fuel/oxidizer ratio ...

Praseodymium ions are available in many oxidation states, so they are capable to form a huge number of different oxides, which make them an interesting and versatile material in many industries, such as ceramics or optics.Although praseodymium oxides behavior has been studied, the information fo...

The effect of the N.N-diethylcarbamoyl indole protecting group on the reactivity of 2-(1,3-dithian-2-yl)indole 7 in front of a series of electrophiles, as well as the potential synthetic usefulness of the resulting 2,2-disubstituted dithianes is reported.