Month: October 2022

Li, Xuefu; Ru, Shaoguo; Tian, Hua; Zhang, Suqiu; Lin, Zhenxian; Gao, Ming; Wang, Jun published the artcile< Combined exposure to environmentally relevant copper and 2,2-dithiobis-pyridine induces significant reproductive toxicity in male guppy (Poecilia reticulata)>, Application of C10H8N2S2, the main research area is Poecilia reproductive toxicity dithiobis pyridine copper risk assessment; (PS)(2); Co-exposure; Cu; Ecological safety; Guppy (Poecilia reticulata); Impaired reproduction.

Metal pyrithiones (MePTs), the most widely used biocides in antifouling paints (AFs) coated on the hulls, are usually used in combination with Cu-containing substances. In the aquatic environment, 2,2-dithiobis-pyridine ((PS)2), the main degradation product of MePTs, and Cu usually coexist. However, their combined impacts on aquatic organisms are unclear. This study exposed male guppy (Poecilia reticulata) to an environmentally realistic concentration of Cu (10μg/L) alone or Cu (10μg/L) combined with 20, 200, and 2000 ng/L (PS)2 to explore their combined reproductive toxicity. The results showed that co-exposure to Cu and (PS)2 increased Cu accumulation in the fish body in a dose-dependent manner and induced obvious spermatozoon apoptosis and necrosis, which was mediated by the peroxidation and caspase activation. Compared to Cu alone, co-exposure to Cu and 200, 2000 ng/L (PS)2 significantly decreased the testosterone level and collapsed spermatogenesis, and depressed male sexual interest and mating behavior were observed in three co-exposure groups. Moreover, co-exposure to Cu and (PS)2 increased the disturbance on cyp19a and cyp19b transcription and suppressed the “”display”” reproductive behavior. Eventually, co-exposure to Cu and (PS)2 caused male reproductive failure. Therefore, the concurrence of Cu and (PS)2 induced significant reproductive toxicity in male guppies and would threaten the sustainability of fish populations. Considering the extensive usage of MePTs products in the AFs, their ecol. risk warrants more evaluation.

Science of the Total Environment published new progress about Animal gene Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (cyp19a). 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Application of C10H8N2S2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Meng, Genyi; Guo, Taijie; Ma, Tiancheng; Zhang, Jiong; Shen, Yucheng; Sharpless, Karl Barry; Dong, Jiajia published the artcile< Modular click chemistry libraries for functional screens using a diazotizing reagent>, Computed Properties of 56622-54-9, the main research area is alkyl aryl azide triazole chemoselective preparation; fluorosulfonyl azide generation chemoselective diazotization primary amine; combinatorial generation library alkyl aryl azide cycloaddition alkyne; functional screen click chem azide generated in situ.

Alkyl and aryl azides were prepared from the corresponding primary alkyl and aryl amines by reaction with fluorosulfonyl azide generated in situ from a fluorosulfonylimidazolium triflate and sodium azide, expanding access to azides and both to the 1,2,3-triazoles derived from them and to functional screens employing them. The method allowed the preparation of a library of >1000 azides from the corresponding amines; the azide library underwent copper-catalyzed azide-alkyne cycloaddition reactions to yield a library of >1000 1,2,3-triazoles.

Nature (London, United Kingdom) published new progress about Alkyl azides Role: CMB (Combinatorial Study), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 56622-54-9 belongs to class pyridine-derivatives, and the molecular formula is C7H10N2, Computed Properties of 56622-54-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ozturkkan Ozbek, Fureya Elif; Ugurlu, Guventurk; Kalay, Erbay; Necefoglu, Hacali; Hokelek, Tuncer published the artcile< Theoretical and experimental assessment of structural, spectroscopic, electronic and nonlinear optical properties of two aroylhydrazone derivative>, Related Products of 93-60-7, the main research area is structural spectroscopic electronic nonlinear optical property aroylhydrazone derivative.

Two aroylhydrazone, N’-(pyridine-4-ylmethylene)nicotic acid hydrazide (1) and N’-(pyridine-3-ylmethylene)nicotic acid hydrazide (2), were synthesized and their structures were determined by single-crystal X-ray diffraction anal. The X-ray anal. indicated that the compound 1 was crystallized in triclinic crystal system with P -1 space group a = 8.7899 (2) Å, b = 10.8983 (3) Å, c = 11.7726 (3) Å, α= 89.952 (3)°, β = 88.684 (3)°, γ= 75.293 (2)°, V = 1090.50 (5) Å3 and Z = 4 and compound 2 was crystallized in monoclinic crystal system with P21/c space group, a = 11.9239 (3) Å, b = 8.6495 (2) Å, c = 11.1021 (3) Å, α= 90 (3)°, β = 111.664 (3) (3)°, γ= 90°, V = 1064.14 (5) Å3 and Z = 4. Intermol. interactions of the compounds were determined by Hirhfeld Surface Anal. The H ··· H interactions with 37.9% (for compound 1) and 37.5% (for compound 2) contributions are the most important interactions to the overall crystal packings. FT-IR, Raman, 1H and 13C NMR and UV-Vis spectroscopy methods were used for spectroscopic characterization of the compounds The spectroscopic properties of the compounds were calculated theor. by using D. Functional Theory (DFT) with B3LYP and ab initio Hartree-Fock (HF) methods at different basis sets. A correlation was found between the theor. and exptl. values for the spectroscopic results. Moreover, the HOMO (HOMO), the LUMO (LUMO), elec. dipole moment (μ), polarizability (α) and hyperpolarizability (β) of the compounds were computed both DFT/B3LYP/6-311++G(d,p) and ab initio HF/6-311++G(d,p) methods. The calculated first hyperpolarizability value at the DFT/B3LYP/6-31++G (d,p) level of compound 1 with dimer structure is 18.14 times larger than urea, the standard nonlinear optical material. So, this value implies that compound 1 considered have potential candidates for designing high quality nonlinear optical materials. The energy gap (ΔEgap) and Mol. Electrostatic Potential (MEP) of the compounds were investigated. The structural and vibration frequency values calculated theor. were compared with the exptl. values.

Journal of Molecular Structure published new progress about Band gap. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Related Products of 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hu, Chaopeng; Zhang, Jianying; Yang, Hao; Guo, Lulu; Cui, Chunming published the artcile< Synthesis of Cationic Silaamidinate Germylenes and Stannylenes and the Catalytic Application for Hydroboration of Pyridines>, HPLC of Formula: 350-03-8, the main research area is cationic silaamidinate germylene stannylene preparation catalyst hydroboration pyridine; crystal structure cationic silaamidinate germylene stannylene; mol structure cationic silaamidinate germylene stannylene; silaamidine deprotonation reaction germanium tin chloride.

The N-heterocyclic germylenes and stannylenes LSi(NAr)2EX (L = PhC(NtBu)2, Ar = 2,6-iPr2C6H3; E = Ge, Sn; X = Cl, CF3SO3, BPh4) supported by the bulky silaamidinate ligand [LSi(NAr)2]- were synthesized and fully characterized. The germylene triflate LSi(NAr)2GeOTf (3b) and dimeric borate [LSi(NAr)2Ge]2ClBPh4 (3a) enabled highly regio- and chemoselective catalytic hydroboration of pyridines and may represent the most active catalytic system for the transformation. DFT calculations disclosed that the cationic germylene [LSi(NAr)2Ge]+ with a low-lying LUMO energy initiated the catalytic process. In contrast, the analogous amidinate germylene triflates are almost inactive, indicating the silaamidinate ligand is essential for the stabilization of cationic species.

Inorganic Chemistry published new progress about Amidination. 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, HPLC of Formula: 350-03-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Cheng, Yin-Jia; Qin, Si-Yong; Ma, Yi-Han; Chen, Xiao-Sui; Zhang, Ai-Qing; Zhang, Xian-Zheng published the artcile< Super-pH-Sensitive Mesoporous Silica Nanoparticle-Based Drug Delivery System for Effective Combination Cancer Therapy>, Product Details of C10H8N2S2, the main research area is peptide doxorubicin silica nanoparticle tumor antitumor; charge-reversal; combinational tumor therapy; mesoporous silica nanoparticles; multifunctional peptide; redox-sensitive drug release.

A multifunctional nanoplatform based on mesoporous silica nanoparticles (MSNs) was developed for combinational tumor therapy. Doxorubicin (DOX) was chosen as an antitumor drug and loaded into mesopores of MSNs via phys. absorption. Then, a tumor-targeted fusion peptide conjugated with 2,3-dimethylmaleic anhydride (DTCPP) and a therapeutic peptide conjugated with 2,3-dimethylmaleic anhydride (DTPP) were introduced to the surface of MSNs as super-pH-sensitive nanovalves through disulfide linkages. The BSA adsorption assay confirmed the charge-reversal property of MSN-ss-DTPP&DTCPP nanoparticles at slightly acidic condition (pH 6.8) and superior stability in physiol. environment (pH 7.4). According to the drug release research, both glutathione (GSH) and acidic condition are required for the accelerated drug release from DOX@MSN-ss-DTPP&DTCPP nanoparticles. Moreover, in vitro studies demonstrated the significantly reinforced tumor cellular uptake efficiency and mitochondrial disruption ability of DOX@MSN-ss-DTPP&DTCPP nanoparticles in tumor environment, in which DOX@MSN-ss-DTPP&DTCPP nanoparticles exhibited the preferred cytotoxicity toward αvβ3-pos. human cervical carcinoma (HeLa) cells. We believe that the multifunctional dual-stimuli-sensitive MSN could provide an effective strategy for combinational tumor therapy.

ACS Biomaterials Science & Engineering published new progress about Antitumor agents. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Product Details of C10H8N2S2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bazyar, Zahra; Tavakoliana, Mina; Hosseini-Sarvari, Mona published the artcile< Au-Pd@ZnO alloy nanoparticles: a promising heterogeneous photocatalyst toward decarboxylative trifluoromethylation under visible-light irradiation>, Electric Literature of 3796-23-4, the main research area is trifluoromethyl arene preparation; carboxylic acid decarboxylative trifluoromethylation palladium gold alloy nanoparticle photocatalyst.

Considering the high synergistic effect of Pd and Au supported on semiconductors, herein, Au-Pd@ZnO was synthesized and characterized with high potential toward the decarboxylative trifluoromethylation of aromatic carboxylic acids RCOOH (R = Ph, 1-naphthyl, benzthiophen-2-yl, etc.). Moreover, the combination of pyridine N-oxide and trifluoroacetic anhydride as a cost-effective and easy-to-handle source of CF3 could successfully generate the trifluoromethyl radical in the presence of the photocatalyst. To shed light on the synergistic effect of Pd and Au various control experiments were conducted, indicating the crucial role of both of them. This protocol was applicable to different aromatic and heteroaromatic compounds to deliver desired adducts in moderate to good yields and high functional group tolerance. Au-Pd@ZnO not only exhibited high catalytic performance but can also be recovered three times.

New Journal of Chemistry published new progress about Aromatic carboxylic acids Role: RCT (Reactant), RACT (Reactant or Reagent). 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Electric Literature of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lemmens, Vincent; Vos, Christophe; Bugaev, Aram L.; Vercammen, Jannick; Van Velthoven, Niels; Gascon, Jorge; De Vos, Dirk E. published the artcile< Ru-Bipyridine Entrapped in the Supercages of EMC-1 Faujasite as Catalyst for the Trifluoromethylation of Arenes>, Reference of 3796-23-4, the main research area is hetero arene trifluoromethylation ruthenium bipyridine supercage faujasite catalyst photochem; Ru(bipy)32+; faujasite; heterogeneous catalysis; photocatalysis; trifluoromethylation.

Trifluoromethyl (CF3) groups are versatile structural motifs especially in the field of agrochems. and pharmaceuticals. However, current trifluoromethylation reactions are generally associated with stoichiometric amounts of transition metals/metal oxidants, homogeneous catalysts, high temperatures, and expensive trifluoromethylating agents. In this work, the homogeneous photocatalyst Ru(bipy)32+ is entrapped in the pores of a faujasite support (EMC-1) via a “”ship-in-a-bottle”” strategy. The formation of the coordination compound was confirmed by Fourier transform IR (FTIR), UV-Vis spectroscopy, and X-ray absorption spectroscopy (XAS). Due to its high stability toward acidified environments, this single-site heterogeneous catalyst is suitable for the trifluoromethylation of synthetically interesting (hetero)arenes under visible-light irradiation at room temperature Furthermore, the heterogeneous catalyst could efficiently be reused for at least three times with minimal catalyst leaching/deactivation.

ACS Applied Materials & Interfaces published new progress about Aromatic hydrocarbons Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Reference of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ma, Jing; Yang, Hai-Lian; Ren, Wei-Hua published the artcile< Functionalized reduced graphene oxide loaded aligned carbon nanotube layer used as counter electrode for dye-sensitized solar cells>, Quality Control of 123-03-5, the main research area is reduced graphene oxide carbon nanotube layer counter electrode DSSC.

A novel bilayer counter electrodes for Dye-sensitized Solar Cells (DSSCs) made of reduced graphene oxide (RGO) and aligned carbon nanotube (ACNT) was developed. The underlayer ACNT severs as a transition layer for RGO. The overlayer of RGO plays the role of catalytic layer. It was demonstrated that the property of graphene counter electrode was adversely affected by aggregation, by adding surfactant, the aggregation of graphene can be inhabited effectively. Moreover, the interface between the RGO and the ACNT can be optimized by surfactant functionalization of RGO. After screening, a cationic surfactant cetylpyridinium chloride (CPC) functionalized RGO, code as CPC-RGO, exhibits the best performance. Compare to the ACNT based counter electrode and other surfactant functionalized RGO/ACNT based bilayer counter electrodes, the CPC-RGO/ACNT reduced interface resistance and improved the double chem. capacitance efficiently, thus uplifting the short circuit c.d. and fill factor from 7.35 to 8.8 mA cm-2, and 59.87 to 62.79, resp. Eventually, the CPC-RGO/ACNT based DSSC giving a power conversion efficiency of 3.9%, which is 1.24-fold than that of ANCT based DSSC, because of the best splay degree of CPC/RGO.

Journal of Nanoscience and Nanotechnology published new progress about Current density. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Quality Control of 123-03-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nitelet, Antoine; Thevenet, Damien; Schiavi, Bruno; Hardouin, Christophe; Fournier, Jean; Tamion, Rodolphe; Pannecoucke, Xavier; Jubault, Philippe; Poisson, Thomas published the artcile< Copper-Photocatalyzed Borylation of Organic Halides under Batch and Continuous-Flow Conditions>, Formula: C11H16BNO2, the main research area is copper photocatalyzed borylation aryl heteroaryl vinyl alkyl halide; aryl vinyl alkyl boronic acid ester preparation electrochem; borylation; continuous flow; copper; photocatalysis; visible light.

The Cu-photocatalyzed borylation of aryl, heteroaryl, vinyl and alkyl halides (I and Br) is reported. The reaction proceeded using a new heteroleptic Cu complex under irradiation with blue LEDs, giving the corresponding boronic-acid esters in good to excellent yields. The reaction was extended to continuous-flow conditions to allow an easy scale-up. The mechanism of the reaction was studied and a mechanism based on a reductive quenching (Cu(I)/Cu(I)*/Cu(0)) was suggested.

Chemistry – A European Journal published new progress about Boronic acids, esters Role: SPN (Synthetic Preparation), PREP (Preparation). 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Formula: C11H16BNO2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bhattacharya, Ritwick; Chatterjee, Arnab; Chatterjee, Soumendranath; Saha, Nimai Chandra published the artcile< Commonly used surfactants sodium dodecyl sulphate, cetylpyridinium chloride and sodium laureth sulphate and their effects on antioxidant defence system and oxidative stress indices in Cyprinus carpio L.: an integrated in silico and in vivo approach>, Application of C21H38ClN, the main research area is surfactant sodium dodecyl sulfate cetylpyridinium chloride antioxidant defense system; Cyprinus carpio; Cytochrome P450; Homology modelling; Molecular docking; Oxidative stress.

The present study evaluated the homol. modeling, in silico prediction and characterization of Cyprinus carpio cytochrome P 450, as well as mol. docking experiments between the modelled protein and the surfactants sodium dodecyl sulfate (SDS), sodium laureth sulfate (SLES) and cetylpyridinium chloride (CPC). Homol. modeling of cytochrome P 450 was performed using the best fit template structure. The structure was optimized with 3D refine, and the ultimate 3D structure was checked with PROCHEK and ERRATA. ExPASy’s ProtParam was likewise used to analyze the modelled protein’s physiochem. and stereochem. attributes. To establish the binding pattern of each ligand to the targeted protein and its effect on the overall protein conformation, mol. docking calculations and protein-ligand interactions were performed. Our in silico anal. revealed that hydrophobic interactions with the active site amino acid residues of cytochrome P 450 were more prevalent than hydrogen bonds and salt bridges. The in vivo anal. exhibited that exposure of fish to sublethal concentrations (10% and 30% of 96 h LC50) of SDS (0.34 and 1.02 mg/l), CPC (0.002 and 0.006 mg/l) and SLES (0.69 and 2.07 mg/l) at 15d, 30d and 45d adversely affected the oxidative stress and antioxidant enzymes (CAT, SOD, GST, GPx and MDA) in the liver of Cyprinus carpio. As a result, the study suggests that elicited oxidative stress, prompted by the induction of antioxidant enzymes activity, could be attributable to the stable binding of cytochrome P 450 with SDS, CPC and SLES which ultimately leads to the evolution of antioxidant enzymes for its neutralization.

Environmental Science and Pollution Research published new progress about Antioxidant enzymes Role: CAT (Catalyst Use), USES (Uses). 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Application of C21H38ClN.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem