sBackgroundD-amino acids have been recognized as bioactive substances in humans. d-Serine and D-alanine are co-agonists of N-methyl-d-aspartate receptors. Glutamate has been suggested to be involved in the pathophysiology of Alzheimer's disease (AD). This study aimed to explore the roles of...
Reports indicate that maternal vitamin D deficiency may be associated with increased inflammation. Long chain polyunsaturated fatty acids (LCPUFAs); omega-3 and omega-6 fatty acids are known to have anti-inflammatory and pro-inflammatory properties respectively. The present study examines the ef...
D-amino acid oxidase (DAAO) is an astroglial enzyme abundantly present in the pain sensing regions including brain and spinal cord. There have been studies indicating an upregulation and increased activity of DAAO in different pain models. Furthermore, the upregulation of DAAO also results in th...
The hydrolysis of cellulose model compound d-cellobiose was studied with a series of eight common polycarboxylic acids and two monocarboxylic acids in aqueous medium using 0.500 mmol -COOH/L at 170 °C. The maleic acid showed the highest catalytic activity with turnover frequency (TOF) of 29.5 h...
Escherichia coli was engineered to produce d-pantothenic acid via systematic metabolic engineering. Firstly, genes of acetohydroxy acid synthase II, pantothenate synthetase, 3-methyl-2-oxobutanoate hydroxymethyltransferase, 2-dehydropantoate 2-reductase and ketol-acid reductoisomerase were edite...
BrCF2CF2Br reacts easily with various potassium thiophenoxides and phenoxides to give respectively 2-bromo tetrafluoroethyl thioethers and ethers. The lipophilicity of C6H5SCF2CF2Br and C6H5OCF2CF2Br is measured and compared with that of the well known C6H5SCF2CF2H and C6H5OCF2CF2H.
It was shown that it was possible to perform fluoroalkylation of both sterically-hindered phenolates and phenols with the use of 2,6-di-tert-butylphenol as an example. The role of sulfur dioxide as an activator of the interaction process was established.
The addition of 1,2-dibromotetrafluoroethane (1) to various terminal alkynes (2a – 2j) was performed in DMF with a redox system (NH4)2S2O8/HCO2Na·2H2O at 40°C. The products (3) were 1:1 adducts reductively debrominated under the reaction conditions, with the E isomers in predominance, and wer...
Vinylidene fluoride (VDF) telomerization has been investigated using 1,2-dibromotetrafluoroethane (I) in the presence of different initiators as telogen. End groups determined by NMR spectroscopy show the different role of the initiator radicals in the telemerization process. The presence of sho...
An efficient and practical synthesis of various aryl tetrafluoroethyl ethers by the reaction of phenols with 1,2-dibromotetrafluoroethane and the subsequent reduction with zinc dust was described. The nucleophilic substitution of 1,2-dibromotetrafluoroethane with phenols initiated by bromophilic...
Treatment of 1,2-dibromotetrafluoroethane with thiophenols in DMF in the presence of sulfur dioxide and pyridines having pKa > 5 gives fluoroalkylated thioethers in high yields under mild conditions. The influence of thiophenol reactant structure and medium basicity is discussed.
Methanol and 2-propanol solutions of 1,2-dibromotetrafluoroethane and 1,1,2-trichlorotrifluoroethane were irradiated with γ-rays after perfect de-oxygenation. The product, formed by the substitution of one of the bromine or chlorine atoms with a hydrogen atom, was observed by radiation-induced ...
Pulse radiolysis technique was used to investigate early stages of radiation-induced reactions in alcohols (methanol and 2-propanol) containing a halogenated compound, Halon2402, and it was found that repetition of irradiation leads to accumulation of a transient species having absorption around...
This review provides an overview of several synthetic applications of 1,2-dibromotetrafluoroethane leading to convenient preparation of numerous fluorine compounds containing –CF2CF2– moiety via ionic and free radical reactions.
As part of its toxicological evaluation we assessed the in vitro metabolism of 1,1,1,2-tetrafluoroethane (R-134a), a non-ozone-depleting chemical likely to replace dichlorodifluoromethane (R-12) as an air-conditioning refrigerant. Hepatocyte suspensions in sealed flasks produced increasing quant...
The molecular structure and conformation of dichloromethylvinylsilane in the gas phase have been determined by electtron diffraction. A force-field, which reproduced experimental vibrational frequencies, was used to calculate mean-square amplitudes of vibration and shrinkage corrections, so that...
The infrared and Raman spectra of dichloromethylvinylsilane, CH2CHSiCl2CH3, were measured in the liquid and solid states. An assignment of the fundamental vibrations was given on the basis of the comparison of the relative intensities between the infrared and Raman bands, depolarization ratios...
The Friedel—Crafts alkylation of alkylbenzenes such as toluene, ethylbenzene, n-propylbenzene, n-butylbenzene, o-, m-, p-xylene, and mesitylene with dichloromethylvinylsilane in the presence of aluminum chloride catalyst has been studied under mild conditions. Alkylation with dichloromethylviny...
Switchable ionic liquids (SILs) are novel green non-aqueous absorbents for energy-efficient post-combustion CO2 capture. However, their regeneration efficiency and viscosity still need to be improved. SILs can be activated by some alkylol amines to improve their regeneration efficiency and reduc...
The corrosion performance of carbon steel (C1018) with inhibitor sodium thiosulphate (STS) has been compared to C1018 (without an inhibitor) and stainless steel (SS316 L) at 80 and 120 °C to determine the feasibility of use in a post-combustion CO2 capture plant (PCCC). The corrosivity of varia...
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