Solar Radiation Pressure (SRP) is the dominant non-gravitational perturbation for GNSS (Global Navigation Satellite System) satellites. In the absence of precise surface models, the Empirical CODE Orbit Models (ECOM, ECOM2) are widely used in GNSS satellite orbit determination. Based on previous...

In this paper an existing combined heat and power (CHP) system in a Petrochemical Plant is analyzed in terms of energy, exergy and environmental (3E) aspects. The system includes steam generators, turbo-generators and a steam distribution network for steam consumers. The system was simulated usi...

One of the main challenges in the building industry is determining the thickness and material of insulations that are used in the external wall. The selection of the above-mentioned parameters depends upon various aspects, including energy, environment, and economy. In many cases, the analysis w...

Under the influence of triethyloxonium tetrafluoroborate in methylene chloride, cis- and trans-2,3-dimethylthiirane are transformed to their corresponding polymers almost instantaneously (at temperatures between 0 and 20 °) but within a few hours these polymers completely degrade to form a mixt...

A Lewis acid catalyzed reaction of trifluoroacetyldiazomethane (CF3COCHN2) with thiourea occurs in boiling THF solution in the presence of BF3·OEt2 yielding 2-amino-4-trifluoromethyl-1,3-thiazole in a fair yield. Analogous reactions with aromatic thioamides, performed in the presence of a mesyl...

Opportunistic fungal infections caused by the Candida spp. are the most common human fungal infections, often resulting in severe systemic infections—a significant cause of morbidity and mortality in at-risk populations. Azole antifungals remain the mainstay of antifungal treatment for candidia...

The Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) spectra of 4-chloro-2-fluoroaniline (CFA) have been recorded and analyzed. The equilibrium geometry, bonding features and harmonic vibrational frequencies have been investigated with the help of ab initio and density f...

Four studies of the 1H NMR spectrum for the aromatic protons of 4-fluoroaniline between 1958 and 1974 give three very different solutions to the second-order, AA′BB′X, spectrum. A re-evaluation of the second-order spectrum was done at 300 MHz. Simultaneous simulations of the 1H NMR spectrum an...

The Zn(II) complex with the monodentate ligand 4-fluoroaniline, ZnCl2(C6H4FNH2)2, has been prepared and characterized by single crystal X-ray diffraction, solid state nuclear magnetic resonance, infrared spectroscopy and differential scanning calorimetry. The Zn(II) ion is tetracoordinated by tw...

Fourteen N- and/or 2-substituted 4-fluoroanilines were prepared (the series includes N–C2-bridged compounds). Some of them were found to be thermally unstable when dissolved in chloroform. Both 19F NMR spectra and comparison of GIAO-DFT calculated and experimental 13C chemical shifts were used ...

The excitation energy of the S1 ← S0 transition (E1) and the adiabatic ionization energy (IE) of 4-chloro-3-fluoroaniline (4C3FA) are found to be 33 242 and 63 868 cm−1, respectively. Comparing these data with those of 4-chloroaniline, 3-fluoroaniline, and aniline, we find an additivity rule as...

The band origin of the S1 ← S0 electronic transition (E1) of 3-chloro-4-fluoroaniline (3C4FA) is found to be 32 348 ± 2 cm−1 and the adiabatic ionization energy (IE) is 63 872 ± 5 cm−1. Comparing the E1’s and IEs of 3C4FA, 3-chloroaniline, 4-fluoroaniline, and aniline, we find an additivity ...

In multi-step organic syntheses, the protection of functional groups such as amines, alcohols, and carbonyl groups is frequently necessary to avoid undesired side reactions. For example, amines can be protected by benzyl groups, which form toluene after removal by hydrogenation. In the present s...

The design, synthesis, in vitro evaluation, and conformational study of nitrosopyrimidine derivatives acting as antifungal agents are reported. Different compounds structurally related with 4,6-bis(alkyl or arylamino)-5-nitrosopyrimidines were evaluated. Some of these nitrosopyrimidines have dis...

In order to discover new anticancer drug leads, a series of novel alkylamino pyrimidine derivatives were designed and synthesized based on our previous work via a ring-opening strategy. Biological evaluation with four human cancer cell lines (MDA-MB-231, A549, HepG2, and MCF-7) showed that most ...

Palladium(II)-catalyzed highly regioselective and stereoselective decarboxylative arylation of unactivated olefins with aryl carboxylic acids has been developed. This method is applicable to a variety of unactivated olefins, including allylamides, long chain functionalized olefins and purely ali...

A series of 7-N-acylaminoethyl/propyloxime derivatives of dehydroabietic acid were synthesized and investigated for their antibacterial activity against Staphylococcus aureus Newman strain and multidrug-resistant strains (NRS-1, NRS-70, NRS-100, NRS-108 and NRS-271). Most of the target compounds...

A diverse of chiral β-lactam bridged analogues of combretastatin A-4 (CA-4), 3-substituted 1,4-diaryl-2-azetidinones, were asymmetrically synthesized and biologically evaluated, leading to identify a number of potent anti-proliferative compounds represented by 14b and 14c with IC50 values of 0....

The present study reports a convenient approach for the synthesis of thiophene sulfonamide derivatives (3a–3k) via Suzuki cross coupling reaction. This method of synthesis involved the reactions of various aryl boronic acids and esters with 5-bromthiophene-2-sulfonamide (2) under mild and suita...

Two new multidentate nitrogen ligands containing a 2,6-bis(2′-pyrazinyl)pyridine (bpp) backbone were synthesized and characterized. The facile Kröhnke condensation procedure allows for efficient synthesis and modification of this class of N-rich ligands. The metal-mediated self-assembly of thes...