Month: November 2022

Lakshmi, Dhana published the artcileElectrochemical Sensor for Catechol and Dopamine Based on a Catalytic Molecularly Imprinted Polymer-Conducting Polymer Hybrid Recognition Element, Recommanded Product: Benzyl diethylcarbamodithioate, the publication is Analytical Chemistry (Washington, DC, United States) (2009), 81(9), 3576-3584, database is CAplus and MEDLINE.

One of the difficulties with using molecularly imprinted polymers (MIPs) and other elec. insulating materials as the recognition element in electrochem. sensors is the lack of a direct path for the conduction of electrons from the active sites to the electrode. The authors have sought to address this problem through the preparation and characterization of novel hybrid materials combining a catalytic MIP, capable of oxidizing the template, catechol, with an elec. conducting polymer. In this way a network of “mol. wires” assists in the conduction of electrons from the active sites within the MIP to the electrode surface. This was made possible by the design of a new monomer that combines orthogonal polymerizable functionality; comprising an aniline group and a methacrylamide. Conducting films were prepared on the surface of electrodes (Au on glass) by electropolymerization of the aniline moiety. A layer of MIP was photochem. grafted over the polyaniline, via N,N’-diethyldithiocarbamic acid benzyl ester (iniferter) activation of the methacrylamide groups. Detection of catechol by the hybrid-MIP sensor was specific, and catechol oxidation was detected by cyclic voltammetry at the optimized operating conditions: potential range -0.6 V to +0.8 V (vs. Ag/AgCl), scan rate 50 mV/s, PBS pH 7.4. The calibration curve for catechol was linear to 144 μM, with a limit of detection of 228 nM. Catechol and dopamine were detected by the sensor, whereas analogs and potentially interfering compounds, including phenol, resorcinol, hydroquinone, serotonin, and ascorbic acid, had minimal effect (≤3%) on the detection of either analyte. Non-imprinted hybrid electrodes and bare gold electrodes failed to give any response to catechol at concentrations below 0.5 mM. Finally, the catalytic properties of the sensor were characterized by chronoamperometry and were consistent with Michaelis-Menten kinetics.

Analytical Chemistry (Washington, DC, United States) published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Recommanded Product: Benzyl diethylcarbamodithioate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Tateo, F. published the artcileIdentification of organic contaminants in disposable aluminium foil containers, Category: esters-buliding-blocks, the publication is Food Additives & Contaminants (2006), 23(10), 1030-1037, database is CAplus and MEDLINE.

A series of disposable aluminum foil containers designed for cooking and packaging foods and available on the Italian market were investigated. Using different anal. techniques (near IR (NIR), High Resolution Gas Chromatog. (HR-GC), gas chromatog./mass spectrometry (GC/MS)), organic substances used as lubricants in the manufacturing of the containers were detected on the aluminum layer in contact with the food. These contaminants were not mineral hydrocarbon fractions used for the shaping of can lids and bodies, but had an organic structure identifiable as esters derived by synthesis between fatty acids C8 and C10 with glycerin, and between C16 and C18 with Bu alc. Mixtures of higher esters were also identified as contaminants. Twelve samples were analyzed, and the total amount of contaminant substances was found to range from 900 to 1200 μg/dm². It is recommended, for safety and compliance with European Community (EC) Regulation Number 1935/2004 (27 Oct. 2004), that the use of aluminum foil containers be subject to appropriate regulation concerning substances adopted for technol. purposes.

Food Additives & Contaminants published new progress about 110-34-9. 110-34-9 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ester, name is Isobutyl palmitate, and the molecular formula is C4H6O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kreutz, Jennifer Anna published the artcileA 1-year study of the activities of seven hydrolases in a communal wastewater treatment plant: trends and correlations, Related Products of esters-buliding-blocks, the publication is Applied Microbiology and Biotechnology (2016), 100(15), 6903-6915, database is CAplus and MEDLINE.

The activities of seven hydrolytic enzymes (L-alanine aminopeptidase, esterase, α-and β-glucosidase, phosphomonoesterase, phosphodiesterase, sulfatase) were monitored during 1 yr in parallel and serial treatment units of the biol. stage of a communal wastewater treatment plant. The spatial homogeneity of enzyme activities was high (coefficients of variation <10% for the entire treatment stage). A significant difference between aerated and stirred tanks was not observed Temperature seemed not to exert a direct influence. Long periods with comparably constant activities were interrupted by a few strong, short-time rises. The mean enzyme activities followed the sequence sulfatase < α-glucosidase < phosphodiesterase ≈ β-glucosidase≈esterase < phosphomonoesterase < L-alanine aminopeptidase. The enzyme activities correlated among themselves at different levels. Very strong (r > 0.8) and highly significant (p < 0.01) correlations between the activities of both glucosidases, both phosphoesterases, and between phosphomonoesterase and both glucosidases were ascertained, pointing to the importance of substrate specificity and similarity of metabolic functions. Moderate and strong activity correlations with various wastewater constituents and with process parameters, e.g., concentrations, loads and eliminated amounts of phosphorous, TOC concentrations and loads of the plant effluent, dry matter content of activated sludge, and sludge volume, were found.

Applied Microbiology and Biotechnology published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Horvath, Flora published the artcileOrganogelators with dual β- and α-nucleating ability in isotactic polypropylene, Application of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Journal of Thermal Analysis and Calorimetry (2022), 147(17), 9451-9468, database is CAplus.

Nucleation efficiency and the special supermol. structure formed in the presence of novel nucleating agents, N,N’-dicyclohexylsuberoylamide and N,N’-dicyclohexylsebacoylamide are presented in this work. The nucleation effect is studied in isotactic polypropylene (iPP). The melting and crystallization processes as well as the polymorphic composition are studied using calorimetric and thermo-optical techniques, while the solubility of the nucleating agents is studied by rheol. The properties of the iPP products nucleated by the novel compounds are characterized by conventional tensile and impact tests and the optical properties are measured by standardized haze measurements. The results indicated clearly that the studied nucleating agents are partially soluble in the iPP melt and possess dual nucleating ability. The formation of β-phase is evidenced by the calorimetric and thermo-optical measurements. The morphol. of the nucleated samples shows similarity to iPP nucleated by well-known soluble “organogelators”; however, the nucleating agents introduced in this work are the first “organogelators” with β-nucleating efficiency.

Journal of Thermal Analysis and Calorimetry published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Application of Tris(2,4-di-tert-butylphenyl) phosphite.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kojima, Akihiko published the artcileSynthesis and evaluation of a new chiral arsine ligand; 2,2′-bis(diphenylarsino)-1,1′-binaphthyl (BINAs), Quality Control of 126613-06-7, the publication is Tetrahedron Letters (1997), 38(19), 3459-3460, database is CAplus.

Chiral 2,2′-bis(diphenylarsino)-1,1′-binaphthyl [(R)-BINAs] was prepared in 34% yield by reaction of Ph₂AsH with (R)-binaphthol ditriflate in DMF containing 10 mol % Ni(COD)₂-dppe. BINAs was an effective ligand in the asym. Heck cyclization of alkenyl iodide I (R = OSiMe₂CMe₃) when 5 mol % Pd₂(dba)₃ was used as catalyst; 90% chem. yield of tetrahydronaphthalene II was obtained with 82% ee.

Tetrahedron Letters published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H12F6O6S2, Quality Control of 126613-06-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Peters, Marius published the artcileCationic Iridium(I) NHC-Phosphinidene Complexes and Their Application in Hydrogen Isotope Exchange Reactions, Quality Control of 10287-53-3, the publication is European Journal of Inorganic Chemistry (2022), 2022(16), e202200148, database is CAplus.

The reaction of the dimeric iridium complex [Ir(cod)Cl]₂ (cod=1,5-cyclooctadiene) with the N-heterocyclic carbene-phosphinidene adduct (IDipp)PH (1, IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) afforded the neutral bimetallic iridium(I) complex [μ-{(IDipp)PH}{Ir(cod)Cl}₂] (2), and further addition of IDipp(PH) (1) yielded the corresponding monometallic iridium(I) complex [{(IDipp)PH}Ir(cod)Cl] (3). Dechlorination of these complexes with sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBAr^F₄) yielded their cationic derivatives [{μ-(IDipp)PH}{Ir(cod)}₂{μ-Cl}][BAr^F₄] (4) and [{(IDipp)PH}Ir(cod)(PPh₃)][BAr^F₄] (5). All complexes were structurally characterized and showed the expected square-planar coordination geometry and significant polarization of the P-C bond of the NHC-phosphinidene adduct upon metal coordination. The complexes 4 and 5 were tested for their applicability in catalytic H/D exchange reactions, and both complexes showed high activity for a broad range of aromatic substrates, ranging from ketones, amides, esters, nitro compounds and heterocycles.

European Journal of Inorganic Chemistry published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Quality Control of 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bhattacharjee, Jayeeta published the artcileN-Heterocyclic Carbene-Phosphinidenide Complexes as Hydroboration Catalysts, Related Products of esters-buliding-blocks, the publication is Journal of Organic Chemistry (2022), 87(2), 1098-1109, database is CAplus and MEDLINE.

The reactions of the N-heterocyclic carbene-phosphinidene adducts (NHC)PSiMe₃ and (NHC)PH with the dinuclear ruthenium and osmium complexes [(η⁶-p-cymene)MCl₂]₂ (M = Ru, Os) afforded the half-sandwich complexes [(η⁶-p-cymene){(NHC)P}MCl] and [(η⁶-p-cymene){(NHC)PH}MCl₂] with two- and three-legged piano-stool geometries, resp. (NHC = IDipp, IMes; IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene; IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene). The complexes were initially tested as precatalysts for the hydroboration of benzonitrile, and the most active species, the ruthenium complex [(η⁶-p-cymene){(IMes)P}RuCl], was further used for the efficient hydroboration of a wide range (ca. 50 substrates) of nitriles, carboxylic esters, and carboxamides in neat pinacolborane (HBpin) under comparatively mild reaction conditions (60-80°C, 3-5 mol % catalyst loading). Preliminary mechanistic and kinetic studies are reported, and stoichiometric reactions with HBpin indicate the initial formation of the monohydride complex [(η⁶-p-cymene){(IMes)P}RuH] as the putative catalytically active species.

Journal of Organic Chemistry published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Schmidt, Maximilian M. published the artcileInfluence of Charges on the Behavior of Polyelectrolyte Microgels Confined to Oil-Water Interfaces, Synthetic Route of 617-52-7, the publication is Langmuir (2020), 36(37), 11079-11093, database is CAplus and MEDLINE.

The role of electrostatics on the interfacial properties of polyelectrolyte microgels has been discussed controversially in the literature. It is not yet clear if, or how, Coulomb interactions affect their behavior under interfacial confinement. In this work, we combine compression isotherms, at. force microscopy imaging, and computer simulations to further investigate the behavior of pH-responsive microgels at oil-water interfaces. At low compression, charged microgels can be compressed more than uncharged microgels. The in-plane effective area of charged microgels is found to be smaller in comparison to uncharged ones. Thus, the compressibility is governed by in-plane interactions of the microgels with the interface. At high compression, however, charged microgels are less compressible than uncharged microgels. Microgel fractions located in the aqueous phase interact earlier for charged than for uncharged microgels because of their different swelling perpendicular to the interface. Therefore, the compressibility at high compression is controlled by out-of-plane interactions. In addition, the size of the investigated microgels plays a pivotal role. The charge-dependent difference in compressibility at low compression is only observed for small but not for large microgels, while the behavior at high compression does not depend on the size. Our results highlight the complex nature of soft polymer microgels as compared to rigid colloidal particles. We clearly demonstrate that electrostatic interactions affect the interfacial properties of polyelectrolyte microgels.

Langmuir published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C7H10O4, Synthetic Route of 617-52-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Markides, K. published the artcileCyanosilicones as stationary phases in gas chromatography. II. Gum and rubber phases on fused silica, Computed Properties of 16974-11-1, the publication is Journal of Chromatography (1983), 267(1), 29-38, database is CAplus.

The presence of cyano groups in the stationary phase may provide useful selective interactions during separation In capillary gas chromatog., the full utility of such interactions will be evident when the columns show high efficiency, good deactivation, high thermal stability, and reproducibility in retention characteristics. Columns that fulfill these requirements were prepared Fused silica capillaries were treated with HCl, silanized at a high temperature with cyclic cyanopropylsiloxane, and statically coated with cyanopropylsilicone gum, which was finally immobilized by in situ crosslinking. Vulcanization is normally inhibited by cyanopropyl groups, but a certain percent of tolyl groups in the gum made crosslinking possible. The usefulness of the cyanosilicone columns is demonstrated by the separation of several samples such as fatty acid Me esters and pheromones.

Journal of Chromatography published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C14H26O2, Computed Properties of 16974-11-1.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Anselmi, E. published the artcilePerfluoroalkylation of aliphatic thiols in the presence of sodium hydroxymethanesulfinate, Category: esters-buliding-blocks, the publication is Journal of Fluorine Chemistry (2000), 105(1), 41-44, database is CAplus.

Direct perfluoroalkylation of aliphatic thiols was performed in the presence of sodium hydroxymethanesulfinate (Rongalite). Reaction of mercaptoalkanoic esters with trifluoromethyl bromide gave the corresponding trifluoromethylthio ethers. Condensation of alkane dithiols with perfluoroalkyl iodides led mainly to fluorinated dithioethers. These alkylation reactions are interpreted as occurring via in situ formation of dialkyl disulfides. A mixture of Rongalite and water was introduced to a mixture of Me mercaptoacetate and sodium phosphate in DMF. The flask was evacuated and bromotrifluoromethane (gas) was introduced while the pressure was maintained at 4.5 bar. After work-up the yield of Me [(trifluoromethyl)thio]acetate was 48%.

Journal of Fluorine Chemistry published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics