Day: December 30, 2022

Copper(I) Halide for Regioselective Ortho-Halogenation of Directed Arenes was written by Perumgani, Pullaiah C.;Parvathaneni, Sai Prathima;Surendra Babu, G. V.;Srinivas, K.;Mandapati, Mohan Rao. And the article was included in Catalysis Letters in 2018.Electric Literature of C12H11N This article mentions the following:

Described is a copper(I) mediated halogenation via direct C-H functionalization of arenes. The combination of Cu(I) halide and (diacetoxyiodo)benzene provides a robust system for halogenation of 2-arylpyridines. High regio- and mono-selectivity was achieved for chlorination, bromination, and iodination of arene C-H bonds. In the experiment, the researchers used many compounds, for example, 2-(m-Tolyl)pyridine (cas: 4373-61-9Electric Literature of C12H11N).

2-(m-Tolyl)pyridine (cas: 4373-61-9) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Electric Literature of C12H11N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Supramolecular structures of uracil-functionalized PEG with multi-diamidopyridine POSS through complementary hydrogen bonding interactions was written by Wang, Jui-Hsu;Altukhov, Oleksii;Cheng, Chih-Chia;Chang, Feng-Chih;Kuo, Shiao-Wei. And the article was included in Soft Matter in 2013.SDS of cas: 1075-62-3 This article mentions the following:

The authors synthesized (i) a multi-diamidopyridine-functionalized polyhedral oligomeric silsesquioxane (MD-POSS) through nucleophilic substitution and click 1,3-cycloaddition reactions and (ii) both mono- and bis-uracil (U)-functionalized poly(ethylene glycol) derivatives (U-PEG and U-PEG-U, resp.) through Michael additions of U to acryloyl-functionalized PEG oligomers. TEM and dynamic light scattering (DLS) revealed that supramol. structures self-assembled from mixtures of MD-POSS and U-PEG and from MD-POSS and U-PEG-U. FTIR and NMR spectroscopy confirmed the presence of multiple H bonding interactions between the diaminopyridine groups of MD-POSS and the U groups of U-PEG and U-PEG-U. Because of these strong reversible intermol. multiple H bonds, the POSS-based polymer-like supramol. materials exhibited improved thermal properties upon increasing the MD-POSS content. In the experiment, the researchers used many compounds, for example, N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3SDS of cas: 1075-62-3).

N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.SDS of cas: 1075-62-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bioproducts from the pyrolysis of castor seed cake: Basic dye adsorption capacity of biochar and antifungal activity of the aqueous phase was written by Silva, Raquel V. S.;Goncalves, Aline D.;Vinhal, Jonas O.;Cassella, Ricardo J.;Santos, Rodolpho C.;Sasso, Marco Aurelio Dal;Peixoto, Bruno S.;Borba-Santos, Luana P.;Rozental, Sonia;Azevedo, Debora A.;Romeiro, Gilberto A.. And the article was included in Journal of Environmental Chemical Engineering in 2021.Category: pyridine-derivatives This article mentions the following:

Castor seed cake, a solid residue produced after castor oil extraction, has been used as raw material in the pyrolysis process. Crude biochar (40.6% yield) was subjected to four activation methods; the best activating agent for obtaining activated biochar 1 (AB1) with 603.29 m² g^-1 of a specific area comparable to com. active carbon in the methylene blue dye adsorption was concentrated sulfuric acid (H₂SO₄). The adsorption experiments revealed the removal of more than 96% of the dye, kinetic studies showed that a pseudo-second-order (r² ≥ 0.99) model fitted better with evaluated data and that intraparticle diffusion controls the adsorption rate of the dye by AB1. The aqueous phase (19.2% yield) was lyophilized, and the organic extract contains -N (3%), -O (49%), and -NO (48%) content compounds The in vitro antifungal activity against the Cryptococcus species was evaluated, and a low concentration of the aqueous phase induced higher growth inhibition in C. neoformans and C. gattii. Therefore, the use of castor seed cake, an environmental waste, in the preparation of an adsorbent material can be considered a low-cost alternative for water treatment when contaminated with the MB dye. Moreover, the aqueous phase, which is a commonly neglected slow pyrolysis byproduct, could be an efficient option for decontaminating areas with a high fungal load. In the experiment, the researchers used many compounds, for example, Pyridin-4-ol (cas: 626-64-2Category: pyridine-derivatives).

Pyridin-4-ol (cas: 626-64-2) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Enantioselective C-H Bond Addition of Pyridines to Alkenes Catalyzed by Chiral Half-Sandwich Rare-Earth Complexes was written by Song, Guoyong;O, Wylie W. N.;Hou, Zhaomin. And the article was included in Journal of the American Chemical Society in 2014.Computed Properties of C8H11N This article mentions the following:

In the presence of nonracemic lanthanide binaphthyl-fused cyclopentadienyl complexes generated from complexes such as I (R = H, TBDPSO, TIPSO; TBDMS = tert-butyldiphenylsilyl; TIPS = triisopropylsilyl) and triphenylmethyl tetrakis(pentafluorophenyl)borate, pyridines and fused pyridines such as 2-methylpyridine underwent regioselective and enantioselective addition reactions to terminal alkenes and norbornene to give nonracemic norbornyl- and alkylpyridines such as II in 63-98% yields and in 86:14-98:2 er. The structure of II•HBF₄ was determined by X-ray crystallog. In the experiment, the researchers used many compounds, for example, 2-Isopropylpyridine (cas: 644-98-4Computed Properties of C8H11N).

2-Isopropylpyridine (cas: 644-98-4) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Computed Properties of C8H11N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A DFT-Based Computational-Experimental Methodology for Synthetic Chemistry: Example of Application to the Catalytic Opening of Epoxides by Titanocene was written by Jaraiz, Martin;Enriquez, Lourdes;Pinacho, Ruth;Rubio, Jose E.;Lesarri, Alberto;Lopez-Perez, Jose L.. And the article was included in Journal of Organic Chemistry in 2017.Related Products of 628-13-7 This article mentions the following:

A novel DFT-based Reaction Kinetics (DFT-RK) simulation approach, employed in combination with real-time data from reaction monitoring instrumentation (like UV-vis, FTIR, Raman, and 2D NMR bench top spectrometers), is shown to provide a detailed methodol. for the anal. and design of complex synthetic chem. schemes. As an example, it is applied to the opening of epoxides by titanocene in THF, a catalytic system with abundant exptl. data available. Through a DFT-RK anal. of real-time IR data, we have developed a comprehensive mechanistic model that opens new perspectives to understand previous experiments Although derived specifically from the opening of epoxides, the prediction capabilities of the model, built on elementary reactions, together with its practical side (reaction kinetics simulations of real exptl. conditions) make it a useful simulation tool for the design of new experiments, as well as for the conception and development of improved versions of the reagents. From the perspective of the methodol. employed, because both the computational (DFT-RK) and the exptl. (spectroscopic data) components can follow the time evolution of several species simultaneously, it is expected to provide a helpful tool for the study of complex systems in synthetic chem. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Related Products of 628-13-7).

Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Related Products of 628-13-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Use of ionic liquids as additives for the immobilization of lipase from Bacillus sp. was written by Cabrera-Padilla, Rebeca Y.;Melo, Elvio B.;Pereira, Matheus M.;Figueiredo, Renan T.;Fricks, Alini T.;Franceschi, Elton;Lima, Alvaro S.;Silva, Daniel P.;Soares, Cleide M. F.. And the article was included in Journal of Chemical Technology and Biotechnology in 2015.Recommanded Product: 1-Butyl-3-methylpyridinium Chloride This article mentions the following:

BACKGROUND: Ionic liquids (ILs) have been used as additives to immobilize lipase from a new source of Bacillus sp. (ITP-001) by the phys. adsorption method supporting green poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) in order to evaluate the influence of the cationic core ([C4mpy]Cl, [C4min]Cl), of anions ([C4min]Cl, [C4min]N(CN)2, [C4min]Tf2N) and the cation chain length ([C2min]Tf2N, [C4min]Tf2N)) in the immobilization process. The immobilized biocatalysts (IB) were characterized with regard to morphol. and physico-chem. properties, and total activity recovery yield (Ya) and biochem. properties of more efficient IB were evaluated. RESULT: Total activity recovery yield (Ya) for the immobilized biocatalysts employing LI as additives always resulted in higher values compared with the control. The most efficient was using the more hydrophobic IL [C4min]Tf2N, which represents a 2-fold greater increase in the recovery of enzymic activity. It retained more than 73% of its original activity after 20 reuses compared with the control, which, after ten cycles, retained only 33% of its original activity. CONCLUSION: The anions and the cation chain length of ionic liquids have a strong influence on the immobilization process. The results for biocatalyst immobilized with [C4min]Tf2N showed an increase in total activity recovery yield and considerable improvement in operational stability. © 2014 Society of Chem. Industry. In the experiment, the researchers used many compounds, for example, 1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3Recommanded Product: 1-Butyl-3-methylpyridinium Chloride).

1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Recommanded Product: 1-Butyl-3-methylpyridinium Chloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Correlation of gas phase proton affinities with S_N2 nucleophilicities. A quantitative assessment of steric hindrance in S_N2 reactions was written by McManus, Samuel P.. And the article was included in Journal of Organic Chemistry in 1981.Recommanded Product: 2-Isopropylpyridine This article mentions the following:

A method for quant. assessing steric hindrance originating primarily in a nucleophilic component is described. Good correlations (r > 0.985) are observed when nucleophilicities of 3- and 4-substituted pyridines reacting with either FSO₃Me in Me₂CHNO₂ or EtI in PhNO₂ are plotted against gas-phase proton affinities of the pyridine derivatives Observed nucleophilicities for 2-substituted pyridine derivatives fail to correlate with proton affinities because steric factors slow the rates of their S_N2 reactions; hence, low nucleophilicity values are calculated Using the least-squares correlation line for 3- and 4-substituted pyridines, the proton affinities of 2-substituted pyridines may be used to predict steric-free nucleophilicities and, therefore, rates of reaction. These theor. values then give a quant. measure of steric retardation in S_N2 reactions of 2-substituted pyridine derivatives A similar treatment was applied to alcs. reacting with Me tosylate and with pentamethyleneiodonium ion. There are moderate steric effects slowing the reactions of EtOH when the substrate is primary; bulkier alcs. show severe steric retardation in S_N2 reactions. The present treatment is limited to nucleophiles with similar solvation and electrophilicity properties. In the experiment, the researchers used many compounds, for example, 2-Isopropylpyridine (cas: 644-98-4Recommanded Product: 2-Isopropylpyridine).

2-Isopropylpyridine (cas: 644-98-4) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Recommanded Product: 2-Isopropylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ordered-Assembly Conductive Nanowires Array with Tunable Polymeric Structure for Specific Organic Vapor Detection was written by Jiang, Xiangyu;Zhang, Xiqi;Wu, Yuchen;Li, Yunqi;Pang, Jinhui;Zhang, Haitao;Jiang, Lei. And the article was included in Small in 2019.HPLC of Formula: 628-13-7 This article mentions the following:

An artificial organic vapor sensor based on a finite number of 1D nanowires arrays can provide a strategy to allow classification and identification of different analytes with high efficiency, but fabricating a 1D nanowires array is challenging. Here, a coaxial Ag/polymer nanowires array is prepared as an organic vapor sensor with specific recognition, using a strategy combining superwettability-based nanofabrication and polymeric swelling-induced resistance change. Such organic vapor sensor containing com. polymers can successfully classify and identify various organic vapors with good separation efficiency. An Ag/polymer nanowires array with synthetic polyethersulfone polymers is also fabricated, through mol. structure modification of the polymers, to distinguish the similar organic vapors of methanol and ethanol. Theor. simulation results demonstrate introduction of specific mol. interaction between the designed polymers and organic vapors can improve the specific recognition performance of the sensors. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7HPLC of Formula: 628-13-7).

Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.HPLC of Formula: 628-13-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A theoretical evaluation of the pK_HB and ΔH^–_HB hydrogen-bond scales of nitrogen bases was written by Besseau, Francois;Graton, Jerome;Berthelot, Michel. And the article was included in Chemistry – A European Journal in 2008.Safety of 2-Isopropylpyridine This article mentions the following:

The exptl. pK_HB hydrogen-bond (HB) basicity scale and the corresponding ΔH^–_hB enthalpic scale of nitrogen compounds are extended and analyzed in light of simple theor. descriptors using the B3LYP d. functional method and a medium-size basis set (6-31 + G(d,p)). The selected training set includes 59 monofunctional unhindered nitrogen bases for which homogeneous and accurate exptl. pK_HB and ΔH^–_HB data have been determined by means of the association equilibrium of the bases with a reference hydrogen-bond acid, 4-fluorophenol, in CCl₄. The three hybridization states encountered in the nitrogen atom, sp, sp² and sp³, are equally represented in this data set. A proper estimation of their exptl. enthalpy (ΔH^–_HB) is directly attainable from the theor. enthalpy of the complexation reaction with hydrogen fluoride (ΔH^-(HF)). However, a second parameter is required to calculate with good accuracy the exptl. free energy of association represented by pK_HB. About 99% of the variance of the pK_HB scale is described by a bilinear equation using the min. electrostatic potential (V_S,min) of the monomer in addition to the interaction energy (D^(HF)₀). The equations are tested for an external set of 99 addnl. compounds including very different nitrogen bases such as ortho-substituted pyridines, polyazines and azoles. Theor. calculations give a reliable estimation of hydrogen-bond basicity provided that the populations of the different isomers of the bases are taken into account by using the Boltzmann law, and that a specific halogen-bond interaction with the solvent CCl₄ is considered for polybasic mols. The pK_HB scale can thus be extended to important classes of species exptl. inaccessible in CCl₄, to polynitrogen compounds and to mols. of biol. significance. In the experiment, the researchers used many compounds, for example, 2-Isopropylpyridine (cas: 644-98-4Safety of 2-Isopropylpyridine).

2-Isopropylpyridine (cas: 644-98-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Safety of 2-Isopropylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Photochemical Organocatalytic Benzylation of Allylic C-H Bonds was written by Le Saux, Emilien;Zanini, Margherita;Melchiorre, Paolo. And the article was included in Journal of the American Chemical Society in 2022.Formula: C12H9NO This article mentions the following:

Authors report a radical-based organocatalytic method for the direct benzylation of allylic C-H bonds. The process uses nonfunctionalized allylic substrates and readily available benzyl radical precursors and is driven by visible light. Crucial was the identification of a dithiophosphoric acid that performs two distinct catalytic roles, sequentially acting as a catalytic donor for the formation of photoactive electron donor-acceptor (EDA) complexes and then as a hydrogen atom abstractor. By mastering these orthogonal radical generation paths, the organic catalyst enables the formation of benzylic and allylic radicals, resp., to then govern their selective coupling. The protocol was also used to design a three-component radical process, which increased the synthetic potential of the chem. In the experiment, the researchers used many compounds, for example, Phenyl(pyridin-2-yl)methanone (cas: 91-02-1Formula: C12H9NO).

Phenyl(pyridin-2-yl)methanone (cas: 91-02-1) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Formula: C12H9NO

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem