Published in Russian Journal of Applied Chemistry
AbstractThe thermal stability and composition of the gas phase of Sovol technical mixture of polychlorobiphenyls was studied by synchronous thermal analysis and mass spectrometry in comparison with the derivatives synthesized by the reaction of the congeners with sodium methoxide or with polyethylene glycol in the presence of alkali. The obtained m...
Published in Russian Journal of Organic Chemistry
The mechanism of sodium methoxide-catalyzed transesterification of diethyl carbonate with metha-nol to dimethyl carbonate has been studied by DFT quantum chemical calculations using B3LYP functional. Ethoxy groups in the substrate are replaced successively through four-coordinate carbon intermediates which undergo decomposition. Sodium methoxide wi...
Dihalogenated derivatives of 1,2,5-chalcogenadiazoles fused with benzene or heterocyclic rings are of interest as starting compounds for photovoltaic materials. The 1,2,5-chalcogenadiazole ring in these heterocycles was most commonly prepared from the corresponding ortho-diamine moiety. In this communication, 3,6-dibromopyridazine-4,5-diamine was p...
Biodiesel is an environmentally friendly and sustainable fuel. However, the high price of the biodiesel produced from pure vegetable oil contributes to making it uncompetitive in the market. If we can make low cost oils such as waste cooking oil and high-acid-value oil available as resources, the cost of biodiesel production will be reduced signifi...
Published in Catalysis in Industry
Chemical recycling of polyethylene terephthalate (PET) to produce terephthalic acid (TPA) was studied using in situ hydrolysis with sodium methoxide in methanol and dimethyl sulfoxide (DMSO) as solvent under microwave irradiation. The microwave-assisted reaction was carried out at different temperatures, and reaction time between 5 to 30 min. High ...
Published in International Journal of Chemical Reactor Engineering
Biodiesel, a vegetable oil-derived fuel, can be used as a partial or complete substitute to diesel oil. The main argument for its usage in internal combustion engines is its net CO2 balance which is considerably reduced compared to diesel fuel of fossil origin. A systematic study of ultrasound continuous biodiesel production using canola oil was co...
Published in Transactions of Tianjin University
The relation of boron trifluoride concentration with conductivity in boron trifluoride methanol solution (BF3-CH3OH)was power exponent fitted in low concentration range. The kinetics of the reaction between boron trifluoride methanol complex and sodium methoxide to produce enriched 10B methylborate was proposed based on a detailed mechanism study, ...
Bis-Boc-activated 2,5-diketopiperazines on reaction with potassium hydroxide or sodium methoxide in dry tetrahydrofuran led to Boc-protected hydantoins through an unprecedented ring contraction. This rearrangement was applied to several monosubstituted 2,5-diketopiperazines with good yields and regioselectivity.
Published in Chemistry of Heterocyclic Compounds
New N,N'-(alkanediyl)bis(2-imino-2,5-dihydrofuran-3-carboxamides) have been synthesized by the condensation of tertiary α-hydroxy ketones with N,N'-(alkanediyl)bis(2-cyanoacetamides). The obtained products were transformed to the corresponding bisiminium chlorides, 2-oxo-, 2-dicyano-methylene and 2-N-methylimino derivatives.
Published in Biotechnology and Bioprocess Engineering
Present study deals with the optimization of biodiesel production using rapeseed oil as feedstock and NaOCH3 as a catalyst. Optimization of different reaction parameters, such as catalyst concentration, reaction temperature, reaction time. and alcohol to oil molar ratio, was done using response surface methodology (RSM). The optimal experimental co...
