Stereochemistry of N-nitroso-2r,6c-diphenylpiperidin-4-one oxime (1), N nitroso -3t-methyl-2r,6c-diphenylpiperidin-4-one oxime (2), N nitroso-3t-isopropyl -2r,6c-diphenylpiperidin-4-one oxime (3), N nitroso-3t-ethyl-2r,6c-diphenylpiperidin-4-one oxime (4) has been studied using 1H, 13C and two-d...
Methylalumoxane (MAO) is an active pre-catalyst for the polymerization of isobutylene and the copolymerization of isobutylene with isoprene at ambient temperature. The absence of any proton-containing substances suggests that the solvent dichloromethane reacts with the MAO forming the active cat...
In this article, we use defect engineering approach to fine-tune the pore size of MOF-808-SO4. A series of defective MOF-808-SO4 with different pore size were prepared by varying the amount of isophthalic acid as the defective ligand during the synthesis. We obtained a linear correlation between...
Lipid uptake and subsequent degradation was characterized as a function of molecular weight and styrene content in four different formulations of poly(styrene-block-Isobutylene-block-styrene) (SIBS). Mechanical testing in uniaxial tension at varying lipid concentrations showed a consistent decre...
A novel robust poly(styrene-b-isobutylene-b-styrene) (SIBS)-based anion exchange membrane (AEM) could be achieved via quaternization and cross-linking reaction of chloromethylated SIBS with amines in the presence of graphene sheets grafted with polydimethylsiloxane arc-bridges (G-g-Arc PDMS). Th...
As a nontoxic and eco-friendly gelling agent, the copolymer of isobutylene and maleic anhydride (PIBM) was successfully used for aqueous gelcasting of dense solid-state-sintered SiC (S-SiC) ceramics. We acquired low-viscosity SiC-B4C-C slurry with an ultrahigh solid loading of 55 vol% through a ...
A series of HZSM-5 catalysts with different Si/Al ratio were prepared and characterized with various characteristic methods XRD, BET, NH3-TPD, FT-IR spectra of adsorbed pyridine, etc. The effect of Si/Al ratio of HZSM-5 catalysts on the prins condensation of isobutylene and formaldehyde to isopr...
The rate coefficients for the reactions of hydrogen (H) atom with propylene and isobutylene were studied at M06-2X/6-31+G(d,p) and MPWB1K/6-31+G(d,p) level of theories between 200 and 2500 K. The possible mechanism for the reactions of propylene and isobutylene with H atom were examined. The rat...
The atomically economic and green chemical reaction of direct amination of isobutylene to tert-butylamine, particularly under the relative mild reaction conditions available for future industrial use, was carried out over zeolite catalysts possessing different topological structures, from one di...
On basis of thermodynamic empirical equations, the thermodynamic parameters for the direct amination of isobutylene to tert-butylamine, an atomically economic and green chemical reaction, were calculated. In particular, the equilibrium conversion of isobutylene under various reaction conditions ...
Generally, isobutylene is produced by petroleum-derived chemical processes, but manufacturing methods using renewable sources, such as biomass, have been considered because of limited amounts of fossil fuel and environmental issues. In this study, isobutylene was converted from isobutanol throug...
Upon exposure to N2 laser light, a gaseous mixture of trimethyl(2-propynyloxy)silane (TMPSi) and acrolein (AC) produced sedimentary spherical aerosol particles with a mean diameter of ≈ 0.5 μm. The IR spectrum of the sedimentary aerosol particles showed bands characteristic of polyacrolein, an...
Constant current electrolysis of 2-(2-propynyloxy)bromobenzenes in DMF using an undivided cell equipped with a Pt cathode and an Mg anode in the presence of carbon dioxide and an electron transfer mediator, methyl 4-tert-butylbenzoate, resulted in aryl radical cyclization with a carbon–carbon t...
4-(4′-diamino-di-phenyl)-sulfone supported on hollow magnetic mesoporous (HMMS) Fe3O4@SiO2 NPs has been used as a novel and efficient catalyst in the preparation of ethyl 2-amino-5,10-dihydro-5,10-dioxo-4-phenyl-4H benzo[g]chromene-3-carboxylates by a simple one-pot three-component reaction of ...
4-{2-[5-(4-Fluoro-phenyl)- [1,3,4]oxadiazol-2-ylsulfanyl]-ethyl}-morpholine (3) was synthesized by refluxing 1,3,4 oxadiazole-2-thiol with 4-(2-chloroethyl) morpholine hydrochloride. It was characterized by NMR, IR, and Mass spectral studies and finally the structure was confirmed by single crys...
Some new 1,3,4-triazolo-, 1,3,4-oxadiazolo-, 1,3,4-thiadiazol-, and pyrazolo-3,4-dimethylphenyl-1(2H)-oxo-phthalazine derivatives were synthesized and identified by IR, 1H NMR, MS and elemental analysis. Most of the newly synthesized products were tested for their anti-inflammatory activities. A...
The molecular structure and spectroscopic properties of (E)-2-([3,4-dimethylphenyl)imino]methyl)-3-methoxyphenol were investigated by X-ray diffraction, FT-IR and UV–vis spectroscopy. The vibrational frequencies calculatedusing DFT/B3LYP/6-31G(d,p) method. Results showed better agreement with t...
Multitargeted therapy is considered a successful approach to cancer treatment. The development of small molecule multikinase inhibitors through hybridization strategy can provide highly potent and selective anticancer agents. A library of N-alkyl-2-[(4-oxo-3-(4-sulfamoylphenyl)-3,4-dihydroquinaz...
In this study the experimental crystallographic structure and the calculated optimized geometric parameters, vibrational wavenumbers, 1H NMR and 13C NMR chemical shift values, electronic absorption maximum wavelength values, HOMO–LUMO analysis, and molecular electrostatic potential (MEP) of 1-(...
One-pot synthesis of some 1N-acetyl pyrazoles including 1-(3-(3,4-dimethylphenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl) ethanones has been achieved via solvent-free microwave irradiation using substituted chalcones, hydrazine hydrate and acetic anhydride in the presence of catalyt...