Month: November 2022

Nwachukwu, Blessing Chidinma published the artcileEffects of soil properties and carbon substrates on bacterial diversity of two sunflower farms, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid, the publication is AMB Express (2022), 12(1), 47, database is CAplus and MEDLINE.

The sustainable production of sunflower (Helianthus annuus) is crucial and one way to accomplish this feat is to have an understanding of the beneficial bacteria of sunflower rhizosphere. Similarly, the respiratory response of these bacteria needs to be studied to understand their roles in the ecosystem. This study was therefore conceptualized to gain insights into the effects of soil properties and carbon substrate utilization on bacterial community diversity of sunflower rhizosphere grown in Ditsobottla and Kraaipan, North West Province, South Africa. Extracted DNA from sunflower rhizosphere and bulk soils was subjected to 16S amplicon sequencing. Significant differences were observed in the alpha and beta diversities of the soil bacterial communities (p < 0.05). At the order level, among all the bacterial taxa captured in the farms, Bacillales were the most dominant. The abundance of Lactobacillales, Bacillales, Rhizobiales, Enterobacteriales, Burkholderiales, Flavobacteriales, Sphingomonadales, Myxococcales, and Nitrosomonadales obtained from Ditsobottla rhizosphere soil (R1) was pos. influenced by organic matter (OM), while the abundance of Planctomycetales, Cytophagales, Gemmatimonadales, Nitrospirales and Caulobacteriales from Kraaipan rhizosphere soil (R2) was pos. influenced by total N and pH. Bacterial communities of all the soil samples utilized the different carbon substrates (three amino acids, six carbohydrates, and three carboxylic acids) as an energy source. Significant differences (p < 0.05) were only observed in tryptophan and methionine amended soils. Unclassified bacteria were also captured in this study, such bacteria can further be harnessed for sustainable production of sunflower and other agricultural crops.

AMB Express published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C5H11NO2S, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Fathy, E. S. published the artcileFabrication and characterization of gamma-irradiated nanomarble/acrylonitrile and styrene butadiene rubber nanocomposites, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine, the publication is Polymer Engineering & Science (2022), 62(5), 1538-1548, database is CAplus.

A comparative study on two nanocomposites based namely on acrylonitrile-butadiene (NBR) and styrene-butadiene (SBR) synthetic rubbers, reinforced by varying ratios of waste nanomarble particles (WM) was carried out. Silane which served as coupling agent was applied in treating waste marble (TWM) and the characters of the prepared nanocomposites before and after treatments were examined Nanocomposites were fabricated using a laboratory roll mill and pressed under heat, then irradiated with γ-rays at 100 kGy. Filler characterization, using the techniques transmission electron microscopy (TEM), FTIR spectroscopy, and X-ray diffraction (XRD) were discussed. TEM micrographs revealed that though untreated WM particles were within the nanometer scale, however showed incremental reduction in size via silane treatment. Mech. parameters, thermal stability, FTIR and SEM (SEM) of the advanced NBR and SBR nanocomposites have been studied. Filler loading with 5 wt% led to remarked improvement in the tensile strength (TS), modulus of elasticity (M₁₀₀), and tearing strength of the NBR nanocomposite samples. Meanwhile, elongation at break of SBR nanocomposites exhibited regressive behavior. Thermal stability testing of pristine NBR and SBR specimens demonstrated adverse features by compounding with untreated and treated waste nanomarble. Furthermore, gamma irradiated NBR nanocomposites reinforced with TWM indicated appreciable development at all thermogravimetric stages. Whereas, irradiation of SBR nanocomposites with a gamma integral dose of 100 kGy resulted in slight enhancement in thermal stability.

Polymer Engineering & Science published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Abel, Anton S. published the artcile6-Polyamino-substituted quinolines: synthesis and multiple metal (Cu^II, Hg^II and Zn^II) monitoring in aqueous media, Formula: C6H20Cl2N4, the publication is Organic & Biomolecular Chemistry (2019), 17(17), 4243-4260, database is CAplus and MEDLINE.

Chemoselective palladium-catalyzed arylation of polyamines with 6-bromoquinoline was explored to prepare chelators for the detection of metal cations in aqueous media. The introduction of a single aromatic moiety into non-protected polyamine mols. was achieved using the com. available Pd(dba)₂/BINAP precatalyst to afford nitrogen chelators, in which the aromatic signaling unit is directly attached to the polyamine residue. Water-soluble receptors were then synthesized using N-alkylation of these polyamines by hydrophilic coordinating residues. By combining rich photophys. properties of the 6-aminoquinoline unit with a high coordination affinity of chelating polyamines and a hydrophilic character of carboxamido-substituted phosphonic acid diesters in a single mol. device, the authors synthesized chemosensor 5 for selective double-channel (UV-visible and fluorescence spectroscopies) detection of Cu^II ions in aqueous media at physiol. levels. This receptor is suitable for the anal. of drinking water and fabrication of paper test strips for the naked-eye detection of Cu^II ions under UV-light. By increasing the number of donor sites the authors also obtained chemosensor 6 which is efficient for the detection of Hg^II ions. Moreover, chemosensor 6 is also suitable for multiple detection of metal ions because it chelates not only Hg^II but also Cu^II and Zn^II ions displaying different responses of emission in the presence of these three cations.

Organic & Biomolecular Chemistry published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C6H20Cl2N4, Formula: C6H20Cl2N4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Thuery, Pierre published the artcileFunctionalized Aromatic Dicarboxylate Ligands in Uranyl-Organic Assemblies: The Cases of Carboxycinnamate and 1,2-/1,3-Phenylenedioxydiacetate, Computed Properties of 5411-14-3, the publication is Inorganic Chemistry (2020), 59(5), 2923-2936, database is CAplus and MEDLINE.

2-Carboxycinnamic acid (ccnH₂) and the isomeric 1,2- and 1,3-phenylenedioxydiacetic acids (1,2- and 1,3-pddaH₂) have been used to synthesize eight uranyl ion complexes under solvo-hydrothermal conditions. In the four complexes [PPh₄]₂[UO₂(ccn)(NO₃)]₂ (1), [PPh₄]₂[UO₂(ccn)(dibf)]₂ (2), [UO₂(ccn)(bipy)]₂ (3), and [Ni(R,S-Me₆cyclam)][UO₂(ccn)(HCOO)]₂ (4), the ccn^2- dianion retains a nearly planar geometry, which favors the formation of the centrosym. [UO₂(ccn)]₂ dimeric unit. Addnl. terminal ligands, either neutral (bipy = 2,2′-bipyridine) or anionic (nitrate, dibf^– = 1,3-dihydro-3-oxo-1-isobenzofuranacetate, and formate, the two latter formed in situ), complete the uranyl coordination sphere, leading in all cases to discrete, dinuclear species. Sodium(I) bonding to the carboxylate/ether O₄ site of the 1,2-pdda^2- dianion in the two complexes [UO₂Na(1,2-pdda)(OH)] (5) and [(UO₂)₂Na₂(1,2-pdda)₂(C₂O₄)] (6) results in this ligand being planar. Further lateral coordination to uranyl and sodium bonding to a uranyl oxo group allow formation of heterometallic diperiodic networks containing monoperiodic uranyl-only subunits. In the absence of Na⁺ cations, 1,2-pdda^2- adopts a conformation in which one carboxylate group is tilted out of the ligand plane in [UO₂(1,2-pdda)₂Ni(cyclam)] (7) and diaxial carboxylato bonding to nickel(II) unites uranyl-only monoperiodic subunits into a diperiodic network. The 1,3-pdda^2- ligand in [UO₂(1,3-pdda)(H₂O)] (8) is also nonplanar with one tilted carboxylate group, and the bridging bidentate nature of both carboxylate groups allows formation of a triperiodic framework in which both metal and ligand are four-coordinated nodes. While the emission spectra of complexes 1 and 5 display the vibronic progression considered typical of uranyl ion, those of complexes 2, 4, and 8 show broad emission bands which in the case of complex 4 completely replace the uranyl emission and which appear to be ligand-centered. The low energy of these broad bands can be rationalized in terms of the close association of certain ligand pairs within the structures. 2-Carboxycinnamate is a ligand with a marked tendency to planarity, which, in the presence of terminal coligands, consistently forms quasi-planar, dinuclear, dimeric units with the uranyl ion. In contrast, the isomeric 1,2- and 1,3-phenylenedioxydiacetates can adopt either planar or nonplanar conformations, leading to various di- and triperiodic assemblies.

Inorganic Chemistry published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O3, Computed Properties of 5411-14-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Schulz, Michael D. published the artcileCopper(I) halides inhibit olefin isomerized by-products from phosphine-based Grubbs’ metathesis catalysts in polar protic solvents, Synthetic Route of 4141-48-4, the publication is Transition Metal Chemistry (Dordrecht, Netherlands) (2014), 39(7), 763-767, database is CAplus.

Copper(I) halides were employed as ‘phosphine sponges’ to sequester phosphor-ylides when using phosphine-based Grubb’s metathesis catalysis in polar protic solvents and under heat. These cuprous halides were hypothesized to significantly slow the formation of the ruthenium hydride olefin isomerization catalyst. Their use was demonstrated in both cross metathesis and ring-closing metathesis.

Transition Metal Chemistry (Dordrecht, Netherlands) published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C38H24F4O4P2, Synthetic Route of 4141-48-4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Cao, Dawei published the artcileLight-driven transition-metal-free direct decarbonylation of unstrained diaryl ketones via a dual C-C bond cleavage, Formula: C14H14, the publication is Nature Communications (2022), 13(1), 1805, database is CAplus and MEDLINE.

An efficient light-driven transition-metal-free strategy for decarbonylation of unstrained diaryl ketones R¹C(O)R² (R¹ = Ph, 2H-1,3-benzodioxol-5-yl, thiophen-2-yl, etc.; R² = Ph, 4-methoxyphenyl, pyridin-2-yl, etc.) to construct biaryl compounds R¹R² through dual inert C – C bonds cleavage was reported. This reaction featured mild reaction conditions, easy-to-handle reactants and reagents, and excellent functional groups tolerance. The mechanistic investigation and DFT calculation suggest that this strategy proceeds through the formation of dioxy radical intermediate via a single-electron-transfer (SET) process between photo-excited diaryl ketone and DBU mediated by DMSO, followed by removal of CO₂ to construct biaryl compounds

Nature Communications published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Formula: C14H14.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Laps, Shay published the artcileInsight on the order of regioselective ultrafast formation of disulfide bonds in (antimicrobial) peptides and miniproteins, Formula: C20H19NO4, the publication is Angewandte Chemie, International Edition (2021), 60(45), 24137-24143, database is CAplus and MEDLINE.

Disulfide-rich peptides and proteins are among the most fascinating bioactive mols. The difficulties associated with the preparation of these targets have prompted the development of various chem. strategies. Nevertheless, the production of these targets remains very challenging or elusive. Recently, we introduced a strategy for one-pot disulfide bond formation, tackling most of the previous limitations. However, the effect of the order of oxidation remained an underexplored issue. Herein we report on the complete synthetic flexibility of the approach with respect to the order of oxidation of three disulfide bonds in targets that lack the knot motif. In contrast, our study reveals an essential order of disulfide bond formation in the EETI-II knotted miniprotein. This synthetic strategy was applied for the synthesis of novel analogs of the plectasin antimicrobial peptide with enhanced activities against methicillin-resistant Staphylococcus aureus (MRSA), a notorious human pathogen.

Angewandte Chemie, International Edition published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Formula: C20H19NO4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Montoya, Iago Antonio published the artcileInfluence prediction of small organic molecules (ureas and thioureas) upon electrical percolation of AOT-based microemulsions using artificial neural networks, Formula: C3H8N2S, the publication is Tenside, Surfactants, Detergents (2012), 49(4), 316-320, database is CAplus.

In order to predict percolation temperature of AOT-Based microemulsions (AOT/iC₈/H₂O w/o microemulsions) in the presence of small organic mols. (ureas and thioureas), different Artificial Neural Network architectures (ANN) have been carried out using a Perceptron Multilayer Artificial Neural Network with three entrance variables (W = value of the microemulsion, additive concentration, logP value). Best ANN architecture consists in three input neurons, one middle layer (with two neurons) and one output neuron. Correlation values were R = 0.9251 for the training set and R = 0.9719 for the prediction set.

Tenside, Surfactants, Detergents published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Formula: C3H8N2S.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Alam, Todd M. published the artcileSolid-state ¹³C CP/MAS NMR investigations of EDTA-metal complexes, Application In Synthesis of 194491-31-1, the publication is Magnetic Resonance in Chemistry (1997), 35(7), 427-431, database is CAplus.

Solid-state ¹³C CP/MAS NMR spectra are reported for different EDTA-metal complexes. The effect of metal binding on the isotropic ¹³C chem. shift and principal elements of the carboxyl ¹³C chem. shift anisotropy (CSA) tensor are discussed.

Magnetic Resonance in Chemistry published new progress about 194491-31-1. 194491-31-1 belongs to catalysis-chemistry, auxiliary class Carboxylic Acid Salts,Amine,Aliphatic hydrocarbon chain, name is Sodium 2,2′,2”,2”’-(ethane-1,2-diylbis(azanetriyl))tetraacetate xhydrate, and the molecular formula is C10H14N2Na4O9, Application In Synthesis of 194491-31-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Okamura, Takaaki published the artcileOrganocatalytic asymmetric oxy-Michael addition to a γ-hydroxy-α,β-unsaturated thioester via hemiacetal intermediates, Recommanded Product: 2,4,6-Triisopropylbenzenethiol, the publication is Chemical Communications (Cambridge, United Kingdom) (2012), 48(42), 5076-5078, database is CAplus and MEDLINE.

An asym. oxy-Michael addition to a γ-hydroxy-α,β-unsaturated thioester via hemiacetal intermediates in the presence of Cinchona-alkaloid-thiourea-based bifunctional organocatalysts is reported. This method provides a novel enantioselective route to β-hydroxy carboxyl compounds, which in turn can be used to synthesize valuable chiral building blocks.

Chemical Communications (Cambridge, United Kingdom) published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Recommanded Product: 2,4,6-Triisopropylbenzenethiol.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia