The usual sulfation of polysaccharides applying chlorosulfuric acid and pyridine may form products containing pyridine-based impurities, which may yield toxic side effects. The synthesis of pyridine-free polysaccharide sulfates could be realized simply by using xylan that was treated with a redu...

A new one-step, pseudo four-component approach for the synthesis of fully substituted pyridines via ring-opening of the cyclic acyl amidine of 3-amino-1H-isoindol-1-one and its aza-analogues during the reaction with malononitrile in the presence of sodium methoxide, followed by pyridine ring clo...

The molecular mechanics program developed by Allinger (MM2) has been applied to the conformational analysis of two classes of compounds including NC⋯CN structures: linear diazacompounds and 1,4-diazacyclohexanes. The predictions for the linear compounds (1,2-ethanediamine and 1,3-propane...

1,4-Bis[N-(2-tolylsulphonylaminoethyl)]-1,4-diazacyclohexane bridged metal-free and metal phthalocyanine polymers were prepared. The metal-free phthalocyanine polymer was obtained by the reaction of 4,4′-[2,2′-(piperidine-1,4-diyldiethylene)di(tosylimino)]diphthalonitrile with hydroquinone. Th...

This paper reports the preparation of a novel, silica-based, strong anion-exchange stationary phase from a 1,4-diazacyclohexane derivative. To prepare the difunctional strong anion-exchange stationary phase, activated silica beads were first bonded with 3-chloropropyltriethoxysilane and then rea...

Structural and energetic consequences of replacing one or more carbon atoms in small cyclic hydrocarbons with electronegative atoms have been observed due to stereoelectronic anomeric and gauche effects. We have reported the influence of gauche effect on the conformational behavior of a 1,4-diaz...

The synthesis of the cyclohexene segment of portimine, a marine cytotoxin from the dinoflagellate Vulcanodinium rugosum, was achieved. The route includes an acylation/aldol reaction from 3-ethoxycyclohex-2-enone to create the C3 center, the 1,4-addition of a vinyl group at C16, the diastereosele...

We performed a laboratory investigation of the secondary organic aerosol (SOA) formation from cyclohexene photooxidation with different initial NOx and SO2 concentrations at low and high relative humidity (RH). Both SOA yield and number concentration first increase drastically and then, decrease...

Secondary organic aerosol (SOA) is a complex mixture consisting of a variety of oxidation products. In this study, the role of relative humidity (RH) on SOA formation with different [H2O2]0/[cyclohexene]0 was investigated in a smog chamber. It was found that the cyclohexene SOA yield increases w...

Liquid hydrogen donors have found limited industrial application due to the difficulty of their separation from the reaction product. To solve this problem a novel type of solid hydrogen donor is developed and applied in the liquid-phase hydrogenation of cyclohexene on a Pt/Al2O3 catalyst. A sig...

A new method is proposed for the synthesis of octadiene-1,7 by co-metathesis of ethylene and cyclohexene (ethenolysis). The reaction is carried out in a flow setup at elevated pressures using an original NH4ReO4/Al2O3 heterogeneous catalyst. At the first stage of the reaction, carbenes are forme...

Herein we examined the catalytic activity of the copper silicate material SGU-29 for the aerobic partial oxidation of cyclohexene under mild conditions (1 bar of O2 at 70 °C). In particular, the catalytic properties of the active sites provided by [CuO4] square planar units in SGU-29 were inves...

A range of graphitic oxides have been utilised as metal free carbocatalysts for the low temperature oxidation of cyclohexene. The activity of the catalysts was correlated with the amount of surface oxygen on the graphitic oxide. In the case of cyclohexene oxidation, major selectivity is observed...

Adipic acid appears as an intermediate compound for the synthesis of polyamides and preferentially for the production of nylon-6,6 polyamide. It can be synthesized by the oxidation of cyclohexene by hydrogen peroxide in microemulsion media which has the main advantage to lead a better contact be...

An atom-economic and moderate approach for highly selective one-step catalytic amination of cyclohexene to cyclohexylamine using HZSM-5 with a Si/Al ratio of 38 has been successfully developed in this work. Results showed that 4.3% cyclohexene conversion with 100% selectivity to cyclohexylamine ...

Mixtures formed by cyclohexane + 1-alkanol have been investigated in the framework of the Kirkwood–Buff theory of solution. The alcohols considered are 1-pentanol up to 1-decanol. Data for the Kirkwood–Buff integrals, Gij excess or deficit number of molecules around the central ones, Δnij and...

Most of TiO2 have been reported to photocatalyze the selective oxidation of cyclohexane under ultraviolet light illumination. In this work, the Ti3+ self-doped TiO2 submicrometer-sized particles (Ti3+/TiO2 SMP) were used as catalyst for visible-light driven photocatalytic cyclohexane oxidation f...

Photosynthetic microorganisms offer promising perspectives for the sustainable production of value-added compounds. Nevertheless, the cultivation of phototrophic organisms to high cell densities (HCDs) is hampered by limited reactor concepts. Co-cultivation of the photoautotrophic Synechocystis ...

The interconversion pathways along the puckering transitions in cyclohexane were explored on the two-dimensional projection of the Cremer-Pople sphere using DFT methods and the CCSD(T), MP2, and dispersion-corrected DFT methods with various basis sets were assessed for the relative energies of l...

Toluene is a widely misused solvent that causes a variety of behavioral effects in both humans and animals. Preclinical and clinical research has provided evidence that toluene inhalation produces psychoactive effects similar to those caused by other Central Nervous System depressant drugs, but ...