Tag: M.W=50-100

Tamura, Masazumi published the artcileEfficient and Substrate-Specific Hydration of Nitriles to Amides in Water by Using a CeO₂ Catalyst, SDS of cas: 16332-06-2, the publication is Chemistry – A European Journal (2011), 17(41), 11428-11431, S11428/1-S11428/6, database is CAplus and MEDLINE.

Cerium dioxide (CeO₂) is an effective heterogeneous catalyst for the hydration of nitriles that have a heteroatom (N or O) adjacent to the α carbon of the CN group. The substrate specificity is derived from an enormous difference of frequency factor. For the hydration of pyrazinecarbonitrile to pyrazinecarboxamide in water, CeO₂ shows higher activity than the state-of-the-art catalysts including enzymes. A Michaelis-Menten-type mechanism is proposed, which involves (1) H₂O dissociation on CeO₂, (2) adsorption of the nitrile on CeO₂, and (3) nucleophilic attack of a hydroxyl species to the adsorbed nitrile.

Chemistry – A European Journal published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C4H6O3, SDS of cas: 16332-06-2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Castorina, Rosemary published the artcilevolatile organic compound emissions from markers used in preschools, schools, and homes, Formula: C4H10O2, the publication is International Journal of Environmental Analytical Chemistry (2016), 96(13), 1247-1263, database is CAplus.

There is little published research examining volatile organic compound (VOC) emissions from art markers. In this study, we characterised VOC emission rates from markers commonly used by children at home and in school, and by teachers in their classrooms. We developed a method to measure standardised emission rates under controlled laboratory conditions, focusing on four major marker types: permanent, dry erase, highlighter, and washable. Emission rates for other less common marker types were also measured. We conducted addnl. experiments determining changes in emission profiles over short and long time periods (several hours up to daily use over about 2 mo), as well as during periods of active drawing. We tested a total of 101 markers and report emission rates for 60 chems. Permanent and dry erase markers had average total VOC emissions more than 400 times higher than highlighters and washable markers. Alcs. were the most highly emitted class of VOCs from permanent and dry erase markers. Some chems. associated with potentially serious health concerns were also identified. Future studies that employ full-scale chamber experiments and personal monitoring in classrooms to measure children’s actual exposures are recommended.

International Journal of Environmental Analytical Chemistry published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C4H10O2, Formula: C4H10O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Moldovan, Rares-Petru published the artcileDevelopment of a High-Affinity PET Radioligand for Imaging Cannabinoid Subtype 2 Receptor, SDS of cas: 1589-47-5, the publication is Journal of Medicinal Chemistry (2016), 59(17), 7840-7855, database is CAplus and MEDLINE.

Cannabinoid receptors type 2 (CB₂) represent a target with increasing importance for neuroimaging due to its upregulation under various pathol. conditions. Encouraged by preliminary results obtained with [¹¹C](Z)-N-(3-(2-methoxyethyl)-4,5-dimethylthiazol-2(3H)-ylidene)-2,2,3,3-tetramethyl-cyclopropanecarboxamide ([¹¹C]A-836339, [¹¹C]1) in a mouse model of acute neuroinflammation (induced by lipopolysaccharide, LPS), we designed a library of fluorinated analogs aiming for an [¹⁸F]-labeled radiotracer with improved CB₂ binding affinity and selectivity. Compound (Z)-N-(3-(4-fluorobutyl)-4,5-dimethylthiazol-2(3H)-ylidene)-2,2,3,3-tetramethyl-cyclopropanecarboxamide (29) was selected as the ligand with the highest CB₂ affinity (K_i = 0.39 nM) and selectivity over those of CB₁ (factor of 1000). [¹⁸F]29 was prepared starting from the bromo precursor (53). Specific binding was shown in vitro, whereas fast metabolism was observed in vivo in CD-1 mice. Animal PET revealed a brain uptake comparable to that of [¹¹C]1. In the LPS-treated mice, a 20-30% higher uptake in brain was found in comparison to that in nontreated mice (n = 3, P < 0.05).

Journal of Medicinal Chemistry published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C4H10O2, SDS of cas: 1589-47-5.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Danov, S. M. published the artcileMathematical modeling of the vapor-liquid equilibrium in the system of products of propylene oxide synthesis in methanol medium, COA of Formula: C4H10O2, the publication is Vestnik MITKHT (2012), 7(1), 36-41, database is CAplus.

Comparison of literature and calculated data on vapor-liquid equilibrium for systems formed by products of propylene oxide synthesis was carried out. On the basis of NRTL and UNIQUAC models the literature data on vapor-liquid equilibrium for the investigated systems were optimized. The model parameters and their deviations were estimated The corresponding phase diagrams were calculated and plotted.

Vestnik MITKHT published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C4H10O2, COA of Formula: C4H10O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Li, Bao published the artcileVapor Liquid Equilibrium for the Binary of 1-Methoxy-2-propanol + 1,2-Propanediol and 2-Methoxy-1-propanol + 1,2-Propanediol at 101.3 kPa and 50.0 kPa, Quality Control of 1589-47-5, the publication is Journal of Chemical & Engineering Data (2020), 65(11), 5110-5117, database is CAplus.

The isobaric vapor-liquid equilibrium (VLE) data of 1-methoxy-2-propanol (PM) + 1,2-propanediol (PG) and 2-methoxy-1-propanol (MP) + 1,2-propanediol (PG) was measured in this work by a modified Rose-Williams still under pressures of 101.3 kPa and 50.0 kPa. The Wisniak test and the Van Ness test were applied to confirm the thermodn. consistency of the VLE data. The exptl. isobaric VLE data were correlated by the nonrandom two-liquid and universal quasichem. models. The experiment results showed that these two models perfectly correlate the measured VLE data.

Journal of Chemical & Engineering Data published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C4H10O2, Quality Control of 1589-47-5.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hansen, Anders Lindhardt published the artcileFast and regioselective Heck couplings with N-acyl-N-vinylamine derivatives, Formula: C3H7NO2, the publication is Journal of Organic Chemistry (2005), 70(15), 5997-6003, database is CAplus and MEDLINE.

Highly regioselective Heck couplings of aryl triflates with N-acyl-N-vinylamines lacking an N-alkyl substituent were achieved in good yields using catalytic amounts of Pd₂(dba)₃, DPPF, and diethylisopropylamine in dioxane. The efficiency of these cross-couplings were studied with several N-vinyl amides and an example each of an N-vinyl carbamate and an N-vinyl urea. The Heck coupling products easily underwent acidic hydrolysis to the corresponding aryl Me ketone or in situ hydrogenation in the presence of (Ph₃P)₃RhCl under a hydrogen atm. to provide the N-acyl derivatives of pharmaceutically relevant benzylic amines. The coupling of a vinyl triflate and more interestingly a vinyl tosylate to N-vinyl acetamide was also studied affording a 2-acylamino-1,3-butadiene with the same high regioselectivity in preference for the α-isomer. This result suggests that Heck couplings of electron-rich alkenes with vinyl tosylates also follow a cationic pathway.

Journal of Organic Chemistry published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Formula: C3H7NO2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Krueger, Peter J. published the artcileAmino group stretching vibrations in primary acid amides, Computed Properties of 16332-06-2, the publication is Canadian Journal of Chemistry (1967), 45(14), 1611-18, database is CAplus.

Most primary alkyl, primary α-substituted alkyl, and primary aromatic acid amides exhibit three sharp concentration and temperature dependent absorption bands at 3518 ± 3, 3504 ± 4, and 3486 ± 8 cm.-1, in dilute (0.003M or less) CCl4 solution, just below the fundamental antisymmetric NH2 stretching vibration. These are tentatively assigned to the shifted antisymmetric NH2 stretching vibration in cyclic dimers, cyclic trimers, and cyclic tetramers resp., with increasing NH…O hydrogen bond strength. In all alkyl amides the antisymmetric NH2 band intensity exceeds the symmetric band intensity. Conjugation of the CONH2 group with π-electron systems reverses this intensity relation, except where the acidic NH2 group can form intramol. H bonds. These observations substantiate the previously published views on the nature of the vibrational mechanism of the NH2 group. No evidence is found for enolization of amides in CCl4 solution 31 references.

Canadian Journal of Chemistry published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Computed Properties of 16332-06-2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Vracko, M. published the artcileComparison of predictions of developmental toxicity for compounds of solvent data set, Safety of 2-Methoxypropan-1-ol, the publication is SAR and QSAR in Environmental Research (2022), 33(1), 35-48, database is CAplus and MEDLINE.

We have considered a series of 235 compounds tech. classified as solvents. Chem., they belong to different classes. Their potential developmental toxicity was evaluated using two models available on platform VEGA HUB; model CAESAR and the Developmental/ Reproductive Toxicity library (PG) model. Models provide beside the prediction of developmental toxicity addnl. information on similar compounds from models training sets. In the report, first, we compare the predictions. Second, the sets of similar compounds have been used to implement the clustering scheme. The Kohonen artificial neural network method has been applied as a clustering method. The clusters obtained have been discussed for both models.

SAR and QSAR in Environmental Research published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C8H5F3N4, Safety of 2-Methoxypropan-1-ol.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Daw, Prosenjit published the artcileBifunctional Water Activation for Catalytic Hydration of Organonitriles, Application In Synthesis of 16332-06-2, the publication is Organometallics (2012), 31(9), 3790-3797, database is CAplus.

Treatment of [Rh(COD)(μ-Cl)]₂ with excess ^tBuOK and subsequent addition of 2 equiv of PIN·HBr in THF afforded [Rh(COD)(κC₂-PIN)Br] (1) (PIN = 1-isopropyl-3-(5,7-dimethyl-1,8-naphthyrid-2-yl)imidazol-2-ylidene, COD = 1,5-cyclooctadiene). The x-ray structure of 1 confirms ligand coordination to Rh(COD)Br through the carbene C featuring an unbound naphthyridine. Compound 1 is an excellent catalyst for the hydration of a wide variety of organonitriles at ambient temperature, providing the corresponding organoamides. In general, smaller substrates gave higher yields compared with sterically bulky nitriles. A turnover frequency of 20,000 h^-1 was achieved for the acrylonitrile. A similar Rh(I) catalyst without the naphthyridine appendage turned out to be inactive. DFT studies are undertaken to gain insight on the hydration mechanism. A 1:1 catalyst-H₂O adduct was identified, which indicates that the naphthyridine group steers the catalytically relevant H₂O mol. to the active metal site via double H-bonding interactions, providing significant entropic advantage to the hydration process. The calculated transition state (TS) reveals multicomponent cooperativity involving proton movement from the H₂O to the naphthyridine N and a complementary interaction between the hydroxide and the nitrile C. Bifunctional H₂O activation and cooperative proton migration are recognized as the key steps in the catalytic cycle.

Organometallics published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Application In Synthesis of 16332-06-2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Guan, Qingqing published the artcileBiodiesel from transesterification at low temperature by AlCl₃ catalysis in ethanol and carbon dioxide as cosolvent: Process, mechanism and application, Quality Control of 16332-06-2, the publication is Applied Energy (2016), 380-386, database is CAplus.

Finding a more efficient method for the transesterification of triglycerides to biodiesel fuel (BD) is important in today’s world. In this study, transesterification of trilaurin was carried out in a solution containing 4 wt% of the Lewis acid AlCl₃ dissolved in a cosolvent of ethanol and 5 MPa CO₂. A conversion rate of over 90% was achieved within 1 h at the low temperature of 180°C. The process indicates a co-catalytic effect of the Lewis acid and CO₂. We postulate several key steps for the mechanism. First, the CO₂-ethanol mixture enhances the hydrogen bonding, increasing the concentration of C₂H₅O^·. Second AlCl₃ attacks the oxygen of C-O-C to weaken the bonds to form carbonyl carbon OR1, which is then easily attacked by C₂H₅O^· to give the transesterified product (C₂H₄COOR1). Third, AlCl₃ is finally replaced by H to form glycerin (GL) and intermediates, such as unmethyl esterified compounds (uME). AlCl₃ was used as a flocculant and catalyst for converting waste cooking oil (WCO) to BD. The process achieved 97% free fatty acid (FFA) conversion at 120 °C in 90 min, making it one of the most efficient systems available for WCO recovery. AlCl₃ was also successfully applied to microalgae, signaling the potential for a process that combines harvesting, lipid extraction, and transesterification, leading to fully integrated, microalgae-based BD production

Applied Energy published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Quality Control of 16332-06-2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem