Tag: M.W=300-400

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Glucose oxidase immobilized amine terminated multiwall carbon nanotubes/reduced graphene oxide/polyaniline/gold nanoparticles modified screen-printed carbon electrode for highly sensitive amperometric glucose detection, published in 2019-12-31, which mentions a compound: 16961-25-4, Name is Hydrogen tetrachloroaurate(III) trihydrate, Molecular AuCl4H7O3, Application of 16961-25-4.

A novel amine terminated multiwall carbon nanotubes/polyaniline/reduced graphene oxide/gold nanoparticles modified screen-printed carbon electrode (SPCE) was fabricated. Followed by, glucose oxidase (GOx) was immobilized on SPCE for highly sensitive glucose biosensor. The synthesized nanomaterial and their composites were characterized using scanning electron microscope (SEM) and UV-Visiblespectroscopy. The electrochem. anal. has been followed at different stages of glucose oxidase coating on modified SPCE using cyclic voltammetry. The reduction current has enhanced 13.43 times with the lowest working potential by the modified SPCE when compared to bare SPCE. The glucose biosensor exhibited good reproducibility (90.23%, n = 7), high stability (after 30 days 96% at -20°C storage, 2 wk 74.5% at -4°C storage), wide linear range (1-10 mM), less KMapp value (0.734), lowest detection limit (64μM) and good sensitivity (246μ Acm-2 mM-1). The biosensor was validated for the detection of glucose level in human blood serum samples using the amperometric technique. As designed nanocomposite based SPCE has the potential for an efficient glucose sensor, which also enabled the platform for various biochem. sensors.

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Reference of Pentaerythrityltetrabromide. 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. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Electroreduction of tetrabromoneopentane and 1,1-bisbromomethylcyclopropane.

The electrochem. reduction was studied of tetrabromoneopentane [3229-00-3] in anhydrous DMF (H2O ∼0.01%) in LiClO4 and Me4NBr supporting electrocytes on a Hg cathode. The electrochem. cyclization of the 1,3-dibromides in cyclopropane occurs with the intermediate participation of 3-bromopropyl anions.

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Cui, Yuming; Fu, Lingzi; Cao, Jian; Deng, Yuan; Jiang, Jianxiong published the article 《Synthesis of Dibenzophosphole Oxides via Palladium-Catalyzed Intramolecular Direct Arylation Reactions of ortho-Halodiarylphosphine Oxides》. Keywords: palladium catalyzed intramol arylation cyclization ortho halodiarylphosphine oxide; dibenzophosphole oxide preparation crystal structure; crystal structure dibenzophosphole oxide; mol structure dibenzophosphole oxide.They researched the compound: Tricyclohexylphosphonium tetrafluoroborate( cas:58656-04-5 ).Name: Tricyclohexylphosphonium tetrafluoroborate. 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:58656-04-5) here.

A Pd-catalyzed intramol. direct arylation reaction was developed and two efficient 1-pot sequential direct arylation/Suzuki-Miyaura coupling and intra/intermol. direct arylation reactions were also realized. The method provides a simple and straightforward procedure for the synthesis and further functionalization of dibenzophosphole oxides from easily accessible ortho-halodiarylphosphine oxides in good to excellent yields.

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Category: imidazoles-derivatives. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Spirooxindole synthesis via palladium-catalyzed dearomative reductive-Heck reaction. Author is Liu, Ren-Rong; Xu, Yang; Liang, Ren-Xiao; Xiang, Bin; Xie, Hu-Jun; Gao, Jian-Rong; Jia, Yi-Xia.

Palladium-catalyzed intramol. dearomative reductive-Heck reaction of C2-substituted indoles is developed, which provides access to structurally diverse 3,2′-spiropyrrolidine oxindoles. By changing the hydride source to AcONa base, direct C3-arylation products [2,3-b]quinolinones are achieved in good yields. The reaction of C2-substituted benzofuran is also realized, delivering the desired spiro-product.

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Imidazole – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and crystal structures of a 1D Cu coordination polymer based on tetrakis [3-(carboxyphenyl)oxomethyl] methane acid, the main research direction is coordination polymer copper carboxyphenyloxomethylmethane pyridine complex solvothermal preparation; crystal structure coordination polymer copper carboxyphenyloxomethylmethane pyridine complex; cyclic voltammetry coordination polymer copper carboxyphenyloxomethylmethane pyridine complex; thermal stability coordination polymer copper carboxyphenyloxomethylmethane pyridine complex.Safety of Pentaerythrityltetrabromide.

A semi-rigid tetrahedral linker tetrakis[3-(carboxyphenyl)oxomethyl] methane acid (H4L) and its coordination polymer [Cu(H2L)(Py)2]n (Py = pyridine) were synthesized and characterized by elemental analyses, IR spectroscopy, etc. The single crystal structure show the title complex crystallizes in the monoclinic system with space group C2/c, a 1.9430(7) nm, b 0.9264(3) nm, c 2.7849(9) nm, β 96.763(3)°, Z = 4, F(000) = 1724. In the complex each Cu(II) atoms is coordinated with two pyridine and two oxygen atom from two arms of H2L2-, and displays a one-dimensional line topol. with the other two arms free. Platon calculation show that the guest accessible volume (1.397 nm3 per unit cell) comprises 28.1% of the unit cell volume The thermal anal. shows the title compound is stable up to 236.9°.

In some applications, this compound(3229-00-3)Safety of Pentaerythrityltetrabromide is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

Reference:
Imidazole – Wikipedia,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Spiropentane》. Authors are Murray, M. J.; Stevenson, Eugene H..The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).Recommanded Product: Pentaerythrityltetrabromide. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

A Raman spectroscopic study of the low-boiling products obtained in the debromination of pentaerythrityl bromide by Zn in aqueous MeOH indicated the presence of a 3rd component (I), which showed lines at 581 and 1033 cm.-1. Reduction in molten AcNH2 containing NaI and Na2CO3 increased the yield of I to 40%. Removal of olefins by AgNO3, AgClO4 and Br gives I, C5H8, b. 38.3-8.5°, n20D 1.4117. I is believed to be CH2.CH2.C.CH2.CH2.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Photochromic organic cage-encapsulated Au nanoparticles: light-regulated cavities for catalytic reduction of 4-nitrophenol, published in 2020, which mentions a compound: 16961-25-4, Name is Hydrogen tetrachloroaurate(III) trihydrate, Molecular AuCl4H7O3, Recommanded Product: Hydrogen tetrachloroaurate(III) trihydrate.

A diarylethene-based photochromic cage (DPC) with an adjustable cavity upon irradiation with UV and visible light has been designed and synthesized. Au nanoparticles encapsulated in the organic cage with open and closed states (Au@o-DPC and Au@c-DPC) showed different catalytic activities for the reduction of 4-nitrophenol.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

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.Bose, Paulami; Chakraborty, Papri; Mohanty, Jyoti Sarita; Nonappa; Ray Chowdhuri, Angshuman; Khatun, Esma; Ahuja, Tripti; Mahendranath, Ananthu; Pradeep, Thalappil researched the compound: Hydrogen tetrachloroaurate(III) trihydrate( cas:16961-25-4 ).COA of Formula: AuCl4H7O3.They published the article 《Atom transfer between precision nanoclusters and polydispersed nanoparticles: a facile route for monodisperse alloy nanoparticles and their superstructures》 about this compound( cas:16961-25-4 ) in Nanoscale. Keywords: nanocluster polydisperse nanoparticle monodisperse superstructure atom transfer. We’ll tell you more about this compound (cas:16961-25-4).

Reactions between atomically precise noble metal nanoclusters (NCs) have been studied widely in the recent past, but such processes between NCs and plasmonic nanoparticles (NPs) have not been explored earlier. For the first time, we demonstrate spontaneous reactions between an atomically precise NC, Au25(PET)18 (PET = 2-phenylethanethiol), and polydispersed silver NPs with an average diameter of 4 nm and protected with PET, resulting in alloy NPs under ambient conditions. These reactions were specific to the nature of the protecting ligands as no reaction was observed between the Au25(SBB)18 NC (SBB = 4-(tert-butyl)benzyl mercaptan) and the very same silver NPs. The mechanism involves an interparticle exchange of the metal and ligand species where the metal-ligand interface plays a vital role in controlling the reaction. The reaction proceeds through transient Au25-xAgx(PET)n alloy cluster intermediates as observed in time-dependent electrospray ionization mass spectrometry (ESI MS). High-resolution transmission electron microscopy (HRTEM) anal. of the resulting dispersion showed the transformation of polydispersed silver NPs into highly monodisperse gold-silver alloy NPs which assembled to form 2-dimensional superlattices. Using NPs of other average sizes (3 and 8 nm), we demonstrated that size plays an important role in the reactivity as observed in ESI MS and HRTEM.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Category: imidazoles-derivatives. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Study of surface effects and catalytic properties of selected Ni-based bimetallic nanoparticles by Knudsen effusion mass spectrometry. Author is Broz, Pavel; Hejdukova, Martina; Vykoukal, Vit; Zelenka, Frantisek; Sopousek, Jiri; Bursik, Jiri; Zobac, Ondrej.

Surface effects and catalytic properties of CuNi, AgNi and AuNi bimetallic nanoparticles having diameter 10-30 nm were studied by Knudsen effusion mass spectrometry. The nanoalloys were prepared by solvothermal synthesis using oleylamine. Gradual removing of the organic substances, present on the nanoparticles from the synthesis, accompanied by their oxidation was observed during slow heating. The nanoparticle catalytic activity leading to the oxidation of the organic surface layer to CO2 in final step depends on the selected element in the Ni-based nanoalloy. The CuNi system shows the highest catalytic activity while the AuNi system the smallest one. As demonstrated, the KEMS method can be applied with advantage as a progressive tool for the evaluation of the oxidation catalytic activity of metal nanoparticles. The surface effects and the catalytic properties are discussed in view of our previous studies.

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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: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Palladium(0)-Catalyzed Alkynylation of C(sp3)-H Bonds, the main research direction is alkynylation aliphatic amide alkynyl bromide palladium catalyst.HPLC of Formula: 58656-04-5.

The alkynylation of β-C(sp3)-H bonds in aliphatic amides with alkynyl halides has been enabled using Pd(0)/N-heterocyclic carbene (NHC) and Pd(0)/phosphine (PR3) catalysts. E.g., in presence of [Pd(allyl)Cl]2, bis(adamantyl)imidazolium tetrafluoroborate, and Cs2CO3, alkynylation of amide I with TIPSCCBr gave 81% II. This is the first example of utilizing [AlkynylPd(II)Ln] complexes to activate C(sp3)-H bonds.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem