A new heterocyclic 1,2,3,4-tetrahydroquinoxaline derivative compound, named as (2R,3R)-5-hydroxy-2,3,8-triphenyl-3,4-dihydro-1H-pyrano[3,2-f]quinoxalin-10(2H)-one (A) has been obtanied from baicalein and 1,2,3,4-tetrahydroquinoxaline through a new and relatively straightforward crystallization a...

Thea sinensis; Theaceae; tea; cis-3-hexenal: leaf aldehyde; leaf alcohol; linolenic acid; biosynthesis of leaf alcohol.Linolenic acid and cis-3-hexenal were found in macerated leaves of Thea sinensis and this aldehyde may be produced from linolenic acid by an enzyme contained in macerated leaves...

The genotoxic effects of the 2-alkenals crotonaldehyde, 2-trans-hexenal and 2-trans-6-cis-nonadienal were studied by cytogenetic methods, analyzing frequencies of sister-chromatid-exchanges, numerical and structural chromosome aberrations and micronucleus induction in human blood lymphocytes and...

Several green leaf volatiles have anxiolytic/antidepressant properties and attenuate adrenocortical stress response in rodents. However, it remains unknown whether a mixture of cis-3-hexenol and trans-2-hexenal so-called ‘green odor (GO)’ affects fear-associated post-traumatic stress disorder ...

In our studies aimed to produce new chemicals used in weed control, 2-methyl-1,5-diarylpentadienones were synthesized by the reaction of p-methoxybenzaldehyde, p-nitrobenzaldehyde and p-N,N-dimethylbenzaldehyde, respectively, with 2-butanone, resulting in four model compounds. The phytotoxicity ...

The appropriate diamines reacted with phthaloyl chloride to yield 1,2-bis(2-N,N-dimethylaminomethyleneamino-4-trifluoromethylphenylthio)ethane and 1,2-bis[2′-(3″-phthaleneamino)- 4′-trifluoro-methylphenylthio]ethane. Similarly, 2,6-dinitro-4- trifluoromethylaniline gave N,N-dimethyl-N′-(2,6-...

The standard (p° = 0.1 MPa) molar enthalpies of formation, in the crystalline phase, at T = 298.15 K, for 5-methyluracil, 6-methyluracil, and 5-nitrouracil were derived from the values of the standard massic energies of combustion measured by static bomb combustion calorimetry. The results obta...

The chlorination of 6-methyl-5-nitrouracil with chlorine in methanol results in a two-component mixture of 5-chloro-6-methyl-6-methoxy-5-nitro-5,6-dihydrouracils, while the chlorination of 5-nitro-1,3,6-trimethyluracil under similar conditions gives a mixture of 5-chloro-6-hydroxy-5-nitro-1,3,6-...

(E)- and (Z)-1,2-difluoro-1-(trimethylsilyl)ethenes are readily prepared from trifluorovinyl(trimethyl)silane. These hydro compounds are readily metalated at low temperatures to give a stable lithium intermediate which can be captured by tri-n-butylstannyl chloride to give (E)- and (Z)-1,2-diflu...

This paper analyses the feasibility of HCFO-1224yd(Z), HCFO-1233zd(E) and HFO-1336mzz(Z), three low global warming potential (GWP) refrigerants, as alternatives to HFC-245fa in high-temperature heat pump (HTHP) systems for low-grade waste heat recovery. HTHPs are a sustainable technology that ca...

By using iodine-catalyzed photoisomerization, and HPLC-DAD, we found that were: in the spectrum of each carotene there is a “far UV peak”, which maintains the maximum in all its E/Z isomers and this maximum it is different from E/Z isomers of other carotene. The values of these absorption maxi...

This paper presents the heat transfer coefficients and the frictional pressure drops of R1234ze(Z) and R1233zd(E) boiling inside a commercial Brazed Plate Heat Exchanger (BPHE): the effects of heat flux / mass flux, saturation temperature / pressure, outlet conditions and fluid properties are in...

A synthesis of ethyl-, butyl-, hexyl- and dodecyl-substituted fimbrolides from alkyl-substituted levulinic acid derivatives through bromination and acid promoted lactonisation is described. The underlying reactions have been investigated using levulinic acid as a model, and the effects of varyin...

Multi-drug resistance (MDR) poses a serious threat in the management of infectious diseases. Slow development of antibiotics and acquirement of resistance mechanisms has led the researchers to focus on development of novel chemotherapeutic agents with broad-spectrum activity having multiple site...

In this study, POSS modified methacrylated polyglycidol oligomers (POSS-MPG) were synthesized using different amount of glycidyl POSS and glycidyl methacrylate. The structures of oligomers were characterized by FT-IR and 1H NMR. Hybrid nanocomposite formulations were prepared by mixing POSS-MPG,...

The poly (glycidyl methacrylate) microsphere was modified with trithiocyanuric acid to achieve selective adsorption of silver ions from aqueous solutions. X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR) were used to c...

Dispersions of silver nanoparticles (Ag NPs) in a tetrafunctional thiol were prepared by in situ reduction of silver nitrate with 2,6-di-tert-butyl-para-cresol. The obtained Ag NPs, were maintained in a stable colloidal state for more than eleven months at ambient temperature. The thiol monomer ...

The present study describes a simple method for preparing stable, highly dispersed spherical silver nanoparticles (Ag NPs) in surfactant-free methacrylate resins. Colloidal dispersions of silver in methacrylate resins were obtained by in situ reduction of silver nitrate. The reducing agents were...

Polytetrafluorethylene, PTFE, films were activated and modified via gamma-rays to graft, in two steps, first methyl methacrylate, MMA, and subsequently N-vinylimidazole, NVI. The modified materials with a more reactive surface, PTFE-g-MMA and (PTFE-g-MMA)-g-NVI, were characterized spectroscopica...

ObjectiveEndodontic treatment failures and recontamination remain a major challenge. The objectives of this study were to: (1) develop a new root canal sealer with potent and long-lasting antibiofilm effects using dimethylaminohexadecyl methacrylate (DMAHDM) and nanoparticles of silver (NAg); (2...