144-55-8Relevant articles and documents
Anion inhibition profiles of the γ-carbonic anhydrase from the pathogenic bacterium Burkholderia pseudomallei responsible of melioidosis and highly drug resistant to common antibiotics
Del Prete, Sonia,Vullo, Daniela,Di Fonzo, Pietro,Osman, Sameh M.,AlOthman, Zeid,Supuran, Claudiu T.,Capasso, Clemente
, p. 575 - 580 (2017)
Burkholderia pseudomallei is a Gram-negative saprophytic bacterium responsible of melioidosis, an endemic disease of tropical and sub-tropical regions of the world. A recombinant γ-CA (BpsγCA) identified in the genome of this bacterium was cloned and puri
The Alkali Metal Salts of Methyl Xanthic Acid
Liebing, Phil,Schmeide, Marten,Kühling, Marcel,Witzorke, Juliane
, p. 2428 - 2434 (2020)
Methyl xanthates of the type M(SSC-OMe) (M = Li–Cs) are readily formed when carbon disulfide is reacted with the corresponding alkali metal hydroxides in methanol exposed to air, or with the alkali metal methoxides in dry methanol or THF under exclusion of air. The reactions are easily monitored by 13C NMR spectroscopy. The Na, K, Rb, and Cs salt could be isolated in high yields, while the Li salt decomposed upon attempted isolation. All compounds are readily complexed by crown ethers and form isolable 1:1 adducts, including the elusive Li salt. All products were studied by NMR (1H, 13C, and alkali metal nuclei) and IR spectroscopy, and most of them where structurally characterized by single-crystal X-ray diffraction. Li(SSC-OMe)(12c4) (12c4 = [12]crown-4) and Cs(SSC-OMe)(18c6) (18c6 = [18]crown-6) represent the first structurally characterized lithium and caesium xanthate complexes, respectively.
CO2 capture and release of Na0.7MnO2.05 under water vapor at 25–150?°C
Yanase, Ikuo,Takano, Takuya
, p. 212 - 218 (2019)
Sodium manganates with a layered structure, Na0.7MnO2.05, have been applied to a novel material for CCUS (CO2 capture, utilization, and storage), capable of capturing CO2 at 25 °C in the presence of water vapor and releasing CO2 at 150 °C. The temperatures of capturing and releasing CO2 of Na0.7MnO2.05 were remarkably lower than those of other traditional metal oxides. The CO2 absorption and desorption properties of Na0.7MnO2.05 were investigated by various methods, such as thermogravimetry, Fourier transform infrared spectroscopy, X-ray diffractometry, and gas chromatography. These investigations confirmed that Na0.7MnO2.05 absorbed CO2 at 25 °C in the presence of water vapor to produce NaHCO3 and a birnessite and the CO2 absorption was promoted by increasing relative humidity and CO2 concentration. The CO2 absorption at 25 °C of Na0.7MnO2.05 was promoted by the formation of a strong basic solution on Na0.7MnO2.05, caused by the elution of Na ions from the interlayer of Na0.7MnO2.05 into water, adsorbed on the Na0.7MnO2.05 surface. Furthermore, Na0.7MnO2.05 was regenerated by heating the CO2-absorbed Na0.7MnO2.05 at temperatures as low as 150 °C. The low-temperature regeneration indicates that Na0.7MnO2.05 can be a low-energy consumption material for capturing and releasing CO2 at low temperatures.
β-Na2TeO4: Phase Transition from an Orthorhombic to a Monoclinic Form. Reversible CO2 Capture
Galven, Cyrille,Pagnier, Thierry,Rosman, No?l,Le Berre, Fran?oise,Crosnier-Lopez, Marie-Pierre
, p. 7334 - 7345 (2018)
The present work concerns the tellurate Na2TeO4 which has a 1D structure and could then present a CO2 capture ability. It has been synthesized in a powder form via a solid-state reaction and structurally characterized by thermal X-ray diffraction experiments, Raman spectroscopy, and differential scanning calorimetry. The room temperature structure corresponds to the β-Na2TeO4 orthorhombic form, and we show that it undergoes a reversible structural transition near 420 °C toward a monoclinic system. Ab initio computations were also performed on the room temperature structure, the Raman vibration modes calculated, and a normal mode attribution proposed. In agreement with our expectations, this sodium oxide is able to trap CO2 by a two-step mechanism: Na+/H+ exchange and carbonation of the released sodium as NaHCO3. This capture is reversible since CO2 can be released upon heating by recombination of the mother phase.
Investigation of the Formation of Wegscheiderite, Na2CO3*3NaHCO3
Ball, Matthew C.,Clarke, Rosemary A.,Strachan, Alec N.
, p. 3683 - 3686 (1991)
The reaction of sodium carbonate with water vapour and carbon dioxide has been studied in the temperature range 343-368 K in pure carbon dioxide, and at pressures of water vapour between 1 * 104 and 5 * 104 N m-2.The produ
Photochemical Formic Acid Dehydrogenation by Iridium Complexes: Understanding Mechanism and Overcoming Deactivation
Barrett, Seth M.,Slattery, Samuel A.,Miller, Alexander J. M.
, p. 6320 - 6327 (2015)
The mechanism of photochemical formic acid dehydrogenation catalyzed by [CpIr(bpy)(Cl)]+ (1, bpy = 2,2′-bipyridine) and [Cp Ir(bpy-OMe)(Cl)]+ (1-OMe, bpy-OMe = 4,4′-dimethoxy-2,2′-bipyridine) is examined. The catalysts operate with good turnover frequency (TOF) across an unusually wide pH range. Above pH 7, the evolved gas is >95% pure H2 (along with traces of CO2 but no detectable CO). Light-triggered H2 release from a metal hydride intermediate is found to be the turnover-limiting step, based on the observed first-order dependence on catalyst concentration, saturation behavior in formate concentration, and direct in situ observation of a metal hydride resting state during turnover. Deactivation pathways are identified, including ligand loss and aggregate formation, precipitation of insoluble forms of the catalyst, and deprotonation of the iridium hydride intermediate. Guided by mechanistic insights, improved catalytic activity (initial TOF exceeding 50 h-1), stability (>500 turnovers at nearly 5 atm), and selectivity (>95% H2 gas) are achieved.
Carbon dioxide conversion into the reaction intermediate sodium formate for the synthesis of formic acid
Masood, Muhammad Hanan,Haleem, Noor,Shakeel, Iqra,Jamal, Yousuf
, p. 5165 - 5180 (2020/09/03)
Increased carbon dioxide (CO2) emissions from anthropogenic activities are a contributing factor to the growing global warming worldwide. The economical method to recover and effectively reuse CO2 is through adsorption and absorption. In this study, CO2 is absorbed into the solution of sodium hydroxide having various concentrations (0.01, 0.1, 0.5, 1.0, 3.0 and 5.0?N), and the impact of the solution pH on the various product formation was observed. The resultant products formed at different pH of the absorbing solution are sodium carbonate at pH 10, Trona at pH 9, and sodium hydrogen carbonate at pH 8. The products formed are confirmed through X-ray diffraction analysis. After pH optimization, the sodium hydrogen carbonate formed at pH 8 is converted into sodium formate through hydrogenation in the presence of nickel ferrite catalyst at 80 °C and atmospheric pressure. The sodium formate produced is then used as a precursor to synthesize formic acid upon simple reaction with sulfuric acid. A reaction % age yield of 79 ± 0.2% formic acid is noted. Condensed formic acid vapors are later analyzed, using a high performance?liquid chromatography for the qualitative analysis.
CATALYTIC CONVERSION OF CARBON DIOXIDE TO METHANOL
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Page/Page column 25; 26, (2019/10/29)
The present disclosure relates to a new catalytic process for the production of methanol from carbon dioxide, comprising: (1) the conversion of carbon dioxide and hydrogen to formic acid or formate salts; (2) converting the formic acid or formate salts to diformate esters of diols; (3) hydrogenating the diformate esters to methanol and diols. The diols produced from the hydrogenation reaction can be recovered and re-used to prepare the diformate esters.
Macrocyclic MCL-1 inhibitors and methods of use
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Paragraph 1023, (2019/02/28)
The present disclosure provides for compounds of Formula (I) wherein A2, A3, A4, A6, A7, A8, A15, RA, R5, R9, R10A, R10B, R11, R12, R13, R14, R16, W, X, and Y have any of the values defined in the specification, and pharmaceutically acceptable salts thereof, that are useful as agents for the treatment of diseases and conditions, including cancer. Also provided are pharmaceutical compositions comprising compounds of Formula (I).
A Carbon-Neutral CO2 Capture, Conversion, and Utilization Cycle with Low-Temperature Regeneration of Sodium Hydroxide
Kar, Sayan,Goeppert, Alain,Galvan, Vicente,Chowdhury, Ryan,Olah, Justin,Prakash, G. K. Surya
supporting information, p. 16873 - 16876 (2018/11/06)
A highly efficient recyclable system for capture and subsequent conversion of CO2 to formate salts is reported that utilizes aqueous inorganic hydroxide solutions for CO2 capture along with homogeneous pincer catalysts for hydrogenation. The produced aqueous solutions of formate salts are directly utilized, without any purification, in a direct formate fuel cell to produce electricity and regenerate the hydroxide base, achieving an overall carbon-neutral cycle. The catalysts and organic solvent are recycled by employing a biphasic solvent system (2-MTHF/H2O) with no significant decrease in turnover frequency (TOF) over five cycles. Among different hydroxides, NaOH and KOH performed best in tandem CO2 capture and conversion due to their rapid rate of capture, high formate conversion yield, and high catalytic TOF to their corresponding formate salts. Among various catalysts, Ru- and Fe-based PNP complexes were the most active for hydrogenation. The extremely low vapor pressure, nontoxic nature, easy regenerability, and high reactivity of NaOH/KOH toward CO2 make them ideal for scrubbing CO2 even from low-concentration sources - such as ambient air - and converting it to value-added products.
