Month: April 2022

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Martin, David P.; Springsteen, Caleb H.; LaDuca, Robert L. researched the compound: 3-Pyridinepropionic acid( cas:3724-19-4 ).Related Products of 3724-19-4.They published the article 《Hydrothermal synthesis, structural determination, and thermal properties of 2-D cobalt- and nickel-based coordination polymers incorporating pendant-arm 3-pyridinecarboxylate ligands》 about this compound( cas:3724-19-4 ) in Inorganica Chimica Acta. Keywords: transition metal pyridylcarboxylate preparation structure hydrogen bond; crystal structure cobalt nickel pyridylcarboxylate polymeric. We’ll tell you more about this compound (cas:3724-19-4).

Hydrothermal synthesis has afforded a family of four coordination polymers containing divalent Ni or Co and pendant-arm pyridylcarboxylate ligands. Using 3-pyridylacetic acid and appropriate metal precursors produced [M(3-pyrac)2(H2O)2] phases (M = Co (1); M = Ni (2)), while 3-pyridylpropionic acid generated [M(3-pyrprop)2(H2O)2] coordination polymers (M = Co (3); M = Ni (4)). Single crystal x-ray diffraction revealed that 1-4 all display discrete 2-dimensional layers with (4,4)-topol., anchored via bridging 3-pyridylcarboxylate ligands bearing monodentate carboxylate termini. Intralamellar H bonding between the aquo ligands and unligated carboxylate O atoms is observed within 1-4. The pseudo 3-dimensional structures of 1-4 are further assembled via stacking of individual neutral layers by interlayer H bonding. Thermal properties are also discussed.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

HPLC of Formula: 3229-00-3. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis of photoresponsive dendrimers with a pentaerythrityl tetraazobenzene core. Author is Szalai, Michael L.; McGrath, Dominic V..

Dendrimers are well-defined macromols. having an inherently globular shape. Precise placement of photochromic moieties within a dendrimer interior could lead to reversible, photoinduced property/behavior alteration. Interest lies in the effect of azobenzene photochem. E/Z isomerization on dendrimer properties. Incorporation of three azobenzene subunits at the core of a dendrimer has resulted in materials with both photomodulated size and polarity and dendrimers with four discrete states. The effect of increasing azobenzene content as well as altering the core geometry was explored. Incorporation of four azobenzene moieties at the dendrimer core will make possible the existence of five discrete mol. states depending on the E/Z configuration of the individual azobenzenes (EEEE, EEEZ, EEZZ, EZZZ, ZZZZ). The synthesis of tetraazobenzene-containing dendrimers having a tetrahedral pentaerythrityl-based core was presented.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Facile synthesis of silver-rich Au/Ag bimetallic nanoparticles with highly active SERS properties, published in 2019, which mentions a compound: 16961-25-4, mainly applied to protein anaylsis immunoassay silver gold bimetallic nanoparticle SERS, Quality Control of Hydrogen tetrachloroaurate(III) trihydrate.

The sensitive detection of proteins has attracted great interest in biomedical research since abnormal concentrations of certain proteins often indicate the presence of various chronic diseases. In this work, we propose an immunoassay method based on surface-enhanced Raman scattering (SERS) for the proof-of-concept determination of proteins by using Atto-610 labeled Au/Ag bimetallic nanoparticles (BNPs) as nanotags and a Au/Ag bimetallic film as a substrate. Without the need for added surfactants or organic precursors during the preparation process, silver-enriched Au/Ag BNPs are obtained with relatively clean surfaces by combining a galvanic replacement (GR) reaction with co-reduction of Ag atoms. The changes in morphol., composition and surface plasmon resonance (SPR) involved in the GR reaction are systematically characterized, and the possible mechanism is discussed. The BNPs exhibit considerable SERS activity due to the enrichment of Ag in the nanostructures. Upon the introduction of AuNPs by gold staining, a SERS-based super-sandwich structure is generated that is suitable for immunoassays. Using this approach, rabbit IgG is detected over a wide concentration range with a detection limit of 10 pg L-1.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ren, Jingyun; Ban, Xu; Zhang, Xin; Tan, Siu Min; Lee, Richmond; Tan, Choon-Hong published an article about the compound: tert-Butyl 2-cyanoacetate( cas:1116-98-9,SMILESS:O=C(OC(C)(C)C)CC#N ).Recommanded Product: tert-Butyl 2-cyanoacetate. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:1116-98-9) through the article.

We have developed a method to afford enantiomerically enriched tertiary azides and bromides through pentanidium-catalyzed kinetic resolution (KR) of racemic tertiary bromides under base-free conditions. We found that the absence of water is crucial to attain a high selectivity factor (s). On the other hand, new exptl. observations and DFT modeling led us to propose that enantioconvergent azidation of tertiary bromides proceeded through dynamic kinetic resolution (DKR). The investigations particularly identified the crucial roles of base and water in the enantioconvergent process, thus supporting the proposal that the tertiary bromide isomerizes in the presence of base and water through a SN2X pathway.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Selective C-N Bond Cleavage of N-Acylisatins: Towards High Performance Acylation/Arylation/Transamination Reagents》. Authors are Xiong, Li; Deng, Rong; Liu, Tingting; Luo, Zhongfeng; Wang, Zijia; Zhu, Xiao-Feng; Wang, Hui; Zeng, Zhuo.The article about the compound:Tricyclohexylphosphonium tetrafluoroboratecas:58656-04-5,SMILESS:F[B-](F)(F)F.[PH+](C1CCCCC1)(C2CCCCC2)C3CCCCC3).Quality Control of Tricyclohexylphosphonium tetrafluoroborate. Through the article, more information about this compound (cas:58656-04-5) is conveyed.

New multipurpose arylation/acylation/transamination reagents, N-acylisatins, I (R = Ph, Me, furan-2-yl, cyclohexyl, etc.) have been developed by selective ‘inside-outside’ C-N bond cleavage under different catalytic conditions. As activated amides, N-acylisatins I undergo Rh-catalyzed C-H arylation and Pd-catalyzed acylation by cleavage outside the C-N bond, and the desired biaryls RR1 (R1 = benzo[h]quinolin-10-yl, 5-methyl-1-(pyrimidin-2-yl)-1H-indol-2-yl, 3-methyl-1-(pyrimidin-2-yl)-1H-indol-2-yl, etc.) and diaryl ketones R2C6H4C(O)C6H5 (R2 = H, 4-Me, 3-OMe, 4-F, etc.) were obtained in good to excellent yields. Generally, the combination of N-acylisatins I (R = Ph, (A)) with amines such as N-methylaniline, 2-methylpropan-2-amine, aniline leads to a ring-opening reaction and formation of transamination products 2-(PhC(O)NH)C6H4C(O)C(O)NR3R4 (R3 = H, Me; R4 = Ph, t-Bu) in a predictable manner through inside C-N bond cleavage. Interestingly, treatment of N-acylisatins (A) with amines lead to unexpected outer-ring transamination products PhC(O)NR3R4 when CsF is added, which shows that CsF can favor the outside C-N bond cleavage path. Notably, this work presents a new strategy for multiple chem. transformations of a single amide to achieve various products by selective C-N bond cleavage.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 58656-04-5, is researched, Molecular C18H34BF4P, about Sequential C3 and C5 Direct C-H Arylation of Imidazo[1,2-a]pyrazines with (Hetero)aryl Bromides, the main research direction is regioselective arylation imidazopyrazine aryl heteroaryl bromide.HPLC of Formula: 58656-04-5.

An efficient reaction manifold for the preparation of C3/C5-diarylimidazo[1,2-a]pyrazines through sequential C3 and C5 direct arylation is disclosed. The two distinct palladium catalyst systems showcased herein are compatible with a wide variety of aryl and heteroaryl bromides and are also operative in a one-pot, twofold C-H functionalization event. E.g., in presence of Pd(OAc)2, tricyclohexylphosphonium tetrafluoroborate, PivOH, and K2CO3 in DMF under a flow of N2, arylation of imidazo[1,2-a]pyrazine with 1-bromo-4-(ethylthio)benzene gave the C3 aryl product I (56%). Arylation of I with 4-bromoisoquinoline in presence of Pd(OAc)2, 1,10-phenanthroline, and Cs2CO3 gave 35% C3/C5-diaryl product II.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Collman, James P.; Chien, Allis S.; Eberspacher, Todd A.; Zhong, Min; Brauman, John I. published the article 《Competitive Reaction of Axial Ligands during Biomimetic Oxygenations》. Keywords: pyridine axial ligand oxidation metalloporphyrin biomimetic oxygenation; oxidation catalyst iron porphyrin pyridine tail; biomimetic oxygenation competitive oxidation axial ligand.They researched the compound: 3-Pyridinepropionic acid( cas:3724-19-4 ).Computed Properties of C8H9NO2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:3724-19-4) here.

Nitrogenous bases have commonly been employed as axial ligands for metalloporphyrins in biomimetic model compounds and catalytic oxygenation chem. The addition of bases such as pyridines or imidazoles to metalloporphyrin-catalyzed hydrocarbon oxidation reactions is known to affect catalyst selectivity and turnover rate; this effect was correlated with the electron-donor ability of the ligand. The role of pyridine in these reactions is far more involved than that of a simple axial ligand: pyridine is a competitive substrate and is converted in high yield to the N-oxide. Subsequently, both of these species act as ligands to the metal center. Thus, catalytic systems containing oxidizable pyridines involve complex equilibrium with multiple forms of ligated catalyst, and kinetic results should be interpreted with caution. Alternatives to free pyridine were tested, including a pyridine tail which is covalently attached to the porphyrin.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: tert-Butyl 2-cyanoacetate, is researched, Molecular C7H11NO2, CAS is 1116-98-9, about Synthesis and structure of dialkyl (Z)-3-amino-2-cyano-4-diazopent-2-enedioates, the main research direction is dialkyl aminocyanodiazopentenedioate preparation diastereoselective DFT study; tosyl azide alkyl cyanoacetate diazo transfer reaction pyridine.Formula: C7H11NO2.

Diazo-transfer reaction of tosyl azide and alkyl 2-cyanoacetates in the presence of pyridine at 0° gives the corresponding alkyl 2-cyano-2-diazoacetates. This material readily underwent nucleophilic attack by pyridinium 1-cyano-2-alkoxy-2-oxoethan-1-ide to form dialkyl (Z)-3-amino-2-cyano-4-diazopent-2-enedioates. The X-ray structure of a typical product is reported, as well as DFT computational studies that illuminate the structural features of these stable diazo compounds

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Quality Control of 3-Pyridinepropionic acid. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 3-Pyridinepropionic acid, is researched, Molecular C8H9NO2, CAS is 3724-19-4, about Thermoresponsive organometallic arene ruthenium complexes for tumour targeting. Author is Clavel, Catherine M.; Paunescu, Emilia; Nowak-Sliwinska, Patrycja; Dyson, Paul J..

Application of mild hyperthermia can increase the cytotoxicity of anticancer drugs in tumor cells. In this report, we describe low mol. weight thermoactive ruthenium-based drugs with fluorous chains that are selectively triggered by mild hyperthermia. The organometallic complexes were prepared, characterized, and evaluated for their in vitro cytotoxicity against a panel of human cancer cell lines and non-cancerous immortalized cells. The compounds show considerable chemo-thermal selectivity towards cancer cells (ca. 5 μM vs. >500 μM for healthy cells) for the compound with the longest fluorous chain.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Computed Properties of AuCl4H7O3. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Rapid identification of triptolide in Tripterygium wilfordii products by gold immunochromatographic assay. Author is Duan, Yaping; Luo, Jiaoyang; Liu, Congmin; Shan, Linan; Dou, Xiaowen; Yang, Shihai; Yang, Meihua.

Triptolide colloidal gold immunoassay strip was prepared by using colloidal gold labeled monoclonal antibody purified with saturated ammonium sulfate, triptolide succinate-bovine serum albumin and sheep anti-mouse IgG for the first time in our laboratory Under optimized conditions, the detection limit of TP strip prepared in this study were determined to be 1μg/mL and the total anal. time (including sample preparation) was less than 50 min. Sixty-six batches of Tripterygium wilfordii (T. wilfordii) and its adulterations were analyzed. It was found that 28 batches of T. wilfordii were pos. as detected by the strips and 38 batches were neg. The result of test strip detection was in consistent with that from the UFLC-ESI-MS/MS method. Gold immunochromatog. assay was demonstrated as a rapid, cost-effective, reliable technique for on-site screening of T. wilfordii and its preparations The prepared colloidal gold immunoassay strip can be conveniently used for rapid identification of triptolide containing products.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem