Multicomponent synthesis of propargylamines in the presence of magnetic nanocatalyst

In current study Fe3O4 nanoparticles were used as a catalyst in the synthesis of propargylamines via three component reaction between aldehyde, alkyne, and an amine. The effect of different reaction parameters on conversion of aldehyde was investigated and the samples were characterized by SEM, EDS, GC, and NMR spectroscopy. It was observed that in the presence of Fe3O4 nanoparticles and by applying microwave irradiation reaction time decreased significantly

2-Amino­pyridinium diphenyl­phosphinate monohydrate

In the crystal of the title hydrated salt, C5H7N2 +·C12H10O2P−·H2O, the cations, anions and water mol­ecules connected by N—H⋯O and O—H⋯O hydrogen bonds into a layer along the bc plane; the phenyl rings protrude into the space between the layers. The dihedral angle between rings of anion is 86.1 (1)°

Monoclinic modification of 1,2-bis­(diphenyl­seleno­phosphino­yl)ethane

The complete mol­ecule of the title compound, C26H24P2Se2, is generated by crystallographic 2-fold symmetry, with the rotation axis bisecting the central C—C bond. The dihedral angle between the terminal aromatic rings is 74.1 (1)°

rac-(3-Hydr­oxy-2-phenyl­propionato-κO)triphenyl­tin(IV)

The SnIV atom in the monomeric title compound, [Sn(C6H5)3(C9H9O3)] exists in a distorted SnC3O tetra­hedral geometry. In the crystal structure, inversion dimers arise from pairs of O—H⋯O hydrogen bonds

Preparation and Quality Control of the [153Sm]-Samarium Maltolate Complex as a Lanthanide Mobilization Product in Rats

Development of lanthanide detoxification agents and protocols is of great importance in management of overdoses. Due to safety of maltol as a detoxifying agent in metal overloads, it can be used as a lanthanide detoxifying agent. In order to demonstrate the biodistribution of final complex, [153Sm]-samarium maltolate was prepared using Sm-153 chloride (radiochemical purity >99.9%; ITLC and specific activity). The stability of the labeled compound was determined in the final solution up to 24h as well as the partition coefficient. Biodistribution studies of Sm-153 chloride, [153Sm]-samarium maltolate were carried out in wild-type rats comparing the critical organ uptakes. Comparative study for Sm3+ cation and the labeled compound was conducted up to 48 h, demonstrating a more rapid wash out for the labeled compound. The effective and biological half lives of 2.3 h and 2.46h were calculated for the complex. The data suggest the detoxification property of maltol formulation for lanthanide overdoses

Kinetic non-reversibility of the cracking reactions and its accounting during mathematical modeling of industrial process

The paper presents the approach to the catalytic cracking modeling with consideration of the reactions' reversibility/non-reversibility depending on the current concentrations and the cracking temperature. The thermodynamic analysis of the reactions using the quantum-chemical methods allows formulating a hydrocarbons conversion scheme at the thermal equilibrium temperature between the feedstock and the catalyst. The magnitude of the current chemical attraction of reactions is a criterion of thermodynamic non-reversibility of reactions, which is determined at each stage of the calculation. It has been shown that the change in the concentrations of conversion participants and cracking temperature have a significant effect on the catalytic cracking reactions. Thus, the cyclization reactions are non-reversible up to 512.9 °C (A[rij]=6.46 kJ/mol) during the processing of feedstock with saturated hydrocarbons to aromatics ratio is 2.1 and with further temperature increasing the contribution of reverse reactions rises. Also with increasing the saturated hydrocarbons to aromatics ratio from 2.1 to 3.2 in the feedstock, the equilibrium of the reaction shifts to low temperatures from 512.9 to 508.9 °C (A[rij]=6.497 kJ/mol). It is connected with the fact that intensification of the exotermic reactions (alkylation, condensation, coke formation) under certain conditions is possible. It is an important factor in terms of catalyst deactivation and has an effect on the desired product yield

Catalytic upgrading of bio-oils by esterification

Biomass is the term given to naturally-produced organic matter resulting from photosynthesis, and represents the most abundant organic polymers on Earth. Consequently, there has been great interest in the potential exploitation of lignocellulosic biomass as a renewable feedstock for energy, materials and chemicals production. The energy sector has largely focused on the direct thermochemical processing of lignocellulose via pyrolysis/gasification for heat generation, and the co-production of bio-oils and bio-gas which may be upgraded to produce drop-in transportation fuels. This mini-review describes recent advances in the design and application of solid acid catalysts for the energy efficient upgrading of pyrolysis biofuels

Layered double hydroxides intercalated by long chain anions as oil phase gelling agent

Layered double hydroxides intercalated by long-chain anionic species were prepared and characterized by X-ray powder diffraction.The linear carboxylates are greatly disordered along the stacking direction but dimer fatty acids with planar aromatic moieties show regular X-ray patterns. Alkylarylsulfonates and petroleum sulfonates aggregated in the interlayer spaces forming bimolecular films of constant thickness, which produce integral series of basal reflections in the X-ray diagrams. Solubility and gel strength of prepared exchanged layered double hydroxides were tested in an oil base drilling fluid formulation and applications of these compounds were compared with conventional organophilic clays

Layered double hydroxides intercalated by long chain anions as oil phase gelling agent

485-490Layered double hydroxides intercalated by long-chain anionic species were prepared and characterized by X-ray powder diffraction.The linear carboxylates are greatly disordered along the stacking direction but dimer fatty acids with planar aromatic moieties show regular X-ray patterns. Alkylarylsulfonates and petroleum sulfonates aggregated in the interlayer spaces forming bimolecular films of constant thickness, which produce integral series of basal reflections in the X-ray diagrams. Solubility and gel strength of prepared exchanged layered double hydroxides were tested in an oil base drilling fluid formulation and applications of these compounds were compared with conventional organophilic clays

Multicomponent synthesis of propargylamines in the presence of magnetic nanocatalyst

880-885In current study Fe3O4 nanoparticles have been used as a catalyst in the synthesis of propargylamines via three component reaction between aldehyde, alkyne, and an amine. The effect of different reaction parameters on conversion of aldehyde has been investigated and the samples have been characterized by appropriate techniques. It has been observed that in the presence of Fe3O4 nanoparticles and by applying microwave irradiation reaction time decreased significantly