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 Electrochemical preparation of highly strained hydrocarbons. IV. Controlled potential electrolysis, published in 1971, which mentions a compound: 3229-00-3, Name is Pentaerythrityltetrabromide, Molecular C5H8Br4, Application of 3229-00-3.

1,1-Bis(bromomethyl)cyclopropane (I) is the intermediate in the reduction of C(CH2Br)4 (II) to spiropentane (III). II is reduced [cathode potential between -1.2 and -1.4 V (SCE)] to give I which is reduced at -2.2 V to give III. NMR data for I and III are given.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling of Amides via Site-Selective N-C Bond Cleavage by Cooperative Catalysis.Category: imidazoles-derivatives.

Palladium-catalyzed Suzuki-Miyaura cross-coupling of primary benzamides enabled by a merger of site-selective N,N-di-Boc-activation and cooperative catalysis via N-C bond cleavage for the synthesis of biaryl ketones is reported. We present the synergistic combination of Lewis base and palladium catalysis as a concept to activate inert amide N-C bonds. The mild reaction conditions provide a direct route to structurally diverse ketones. The reaction tolerates a wide range of electrophilic functional groups. Considering the fundamental importance of primary amides as pharmaceutical and synthetic intermediates, the strategy has a potential for developing a diverse array of valuable amide N-C bond functionalization reactions by the synergistic merger of Lewis base and organometallic catalysis.

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Imidazole | C3H4N2 – PubChem

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, ACS Catalysis called Acyl and Decarbonylative Suzuki Coupling of N-Acetyl Amides: Electronic Tuning of Twisted, Acyclic Amides in Catalytic Carbon-Nitrogen Bond Cleavage, Author is Liu, Chengwei; Li, Guangchen; Shi, Shicheng; Meng, Guangrong; Lalancette, Roger; Szostak, Roman; Szostak, Michal, which mentions a compound: 58656-04-5, SMILESS is F[B-](F)(F)F.[PH+](C1CCCCC1)(C2CCCCC2)C3CCCCC3, Molecular C18H34BF4P, Product Details of 58656-04-5.

We report the Pd-catalyzed acyl and the Ni-catalyzed biaryl Suzuki-Miyaura cross-coupling of N-acetyl-amides with arylboronic acids by selective N-C(O) cleavage. Activation of the amide bond by N-acylation provides electronically destabilized, acyclic, nonplanar amide, which readily undergoes cross-coupling with a wide range of boronic acids to produce biaryl ketones or biaryls in a highly efficient manner. Most crucially, the presented results introduce N-acetyl-amides as reactive acyclic amides in the emerging manifold of transition-metal-catalyzed amide cross-coupling. The scope and origin of high selectivity are discussed. Mechanistic studies point to remodeling of amidic resonance and amide bond twist as selectivity determining features in a unified strategy for cross-coupling of acyclic amides. Structural studies, mechanistic investigations as well as beneficial effects of the N-acyl substitution on cross-coupling of amides are reported.

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Imidazole – Wikipedia,
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Recommanded Product: 58656-04-5. 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 PCy3-Catalyzed Ring Expansion of Aziridinofullerenes with CO2 and Aryl Isocyanates: Evidence for a Two Consecutive Nucleophilic Substitution Pathway on the Fullerene Cage. Author is Takeda, Youhei; Kawai, Hajime; Minakata, Satoshi.

A PCy3-catalyzed ring-expansion reaction of aziridine-fused fullerenes (aziridinofullerenes) through the insertion of CO2 and aryl isocyanates is disclosed. The reaction allows for CO2 fixation by aziridinofullerenes, producing oxazolidinone-fused fullerenes (oxazolidinofullerenes) in high yields, whereas treatment with aryl isocyanates led to a new fullerene family – imidazolidinone-fused fullerenes (imidazolidinofullerenes) – in good to high yields [e.g., aziridinofullerene I → oxazolidinofullerene II (86%) under conditions of in situ generation of PCy3 from its HBF4 salt and 30 atm CO2]. Furthermore, a mechanistically related unprecedented fullerenyl phosphonium salt was successfully isolated. Using the isolated salt, mechanistic studies were also investigated.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Product Details of 16961-25-4. 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: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about A new strategy to regulate the selectivity of photo-mediated catalytic reaction.

Here we developed a new method for regulating the selectivity of photo-mediated catalytic reaction by manipulating the surface charge of Au/TiO2 (gold/titanium dioxide) catalysts within chem. reaction timescales. Two kinds of photocatalytic reactions, hydrogenation of acetophenone and benzyl alc. oxidation, have been applied to investigate the photocatalytic performance over Au/TiO2 catalysts with tunable surface charges. We found that a suitable timescale of switching surface charge on Au would benefit for the enhanced quantum efficiency and play different roles in the selectivity of desired products in hydrogenation and oxidation reactions. Au/TiO2 catalyst under 5μs flashing light irradiation exhibits much higher selectivity of 1-phenylethanol in the hydrogenation of acetophenone than that under continuous light and 5 s flashing light irradiation; by contrast, Au/TiO2 catalysts under both flashing light and continuous light irradiation exhibit a similar selectivity of benzaldehyde in benzyl alc. oxidation Our findings will benefit for a better understanding of electronic structure-mediated reaction mechanism and be helpful for achieving highly efficient photocatalytic systems.

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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 Direct Arylation as a Synthetic Tool for the Synthesis of Thiophene-Based Organic Electronic Materials, published in 2011-03-22, which mentions a compound: 58656-04-5, mainly applied to thiophene derivative aryl bromide palladium catalyst direct arylation; arylthiophene regioselective preparation organic electronic material formal synthesis, Safety of Tricyclohexylphosphonium tetrafluoroborate.

The efficient synthesis of thiophene based organic electronic materials can be carried out in high yields using simple starting materials by employing palladium-catalyzed direct arylation. The direct arylation method was applied to the (formal) synthesis of ten mols. that have exhibited promise for applications as optoelectronic materials. The syntheses feature the following advantages over traditional cross-coupling techniques: (1) higher yields, (2) fewer synthetic operations, (3) lower catalyst loadings, and (4) does not employ organometallic intermediates. The advantages of direct arylation make it an ideal strategy for the synthesis of thiophene containing organic electronic materials.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

HPLC of Formula: 16961-25-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Gold recovery using porphyrin-based polymer from electronic wastes: Gold desorption and adsorbent regeneration. Author is Son, Jieun; Hong, Yeongran; Han, Gyeol; Nguyen, Thien S.; Yavuz, Cafer T.; Han, Jong-In.

Electronic wastes containing precious metals have great potential as a sustainable source of such metals. Separation and refining, however, remain complicated, and none of the existing technologies have yet experienced commercialization. A novel porphyrin-based porous polymer, named COP-180, was recently introduced as a powerful adsorbent option, especially for gold, and in this study, aspects of desorption and recovery of adsorbed gold and regeneration of the polymer were investigated. A hydrometallurgical method using non-cyanide leaching agents was developed, and an acid thiourea-based solution was found to be particularly suited for the method based on COP-180 with gold desorption efficiency of 97%. Fourier-transform IR spectroscopy spectra demonstrated the unaffected structure of COP-180 after desorption, implying the potential of its reuse. This high desorption efficiency was achieved even without typical aiding agents by means of a formamidine disulfide-mediated route that prevented thiourea consumption, which is considered a major drawback of the otherwise promising reagent. Using this method, the polymer was able to maintain more than 94% desorption efficiency after five times of regeneration. The results suggest that acid thiourea can offer a workable means of recovering gold particularly from the excellent gold-adsorbent of COP-180, and that repeated regeneration is also possible.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 16961-25-4, is researched, SMILESS is Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+], Molecular AuCl4H7O3Journal, Separation and Purification Technology called The recovery and selective extraction of gold and platinum by novel ionic liquids, Author is Boudesocque, Stephanie; Mohamadou, Aminou; Conreux, Alexandra; Marin, Beatrice; Dupont, Laurent, the main research direction is gold platinum extraction ionic liquid dicyanamide thiocyanato imide.Recommanded Product: Hydrogen tetrachloroaurate(III) trihydrate.

Ionic liquids bearing tetrahexylammonium and tetraoctylammonium cations and halide (Br-), dicyanamide (Dca-), thiocyanato (SCN-) and bis(trifluoromethysulfonyl)imide (Tf2N-) by liquid-liquid extraction were studied on Au(III), Pt(II) and Pt(IV) extraction All the system show excellent extractability of Au(III). It is the same for Pt(II) and Pt(IV) except for Tf2N- based ionic liquids which do not extract Pt(II) and Pt(IV) and constitute selective system for the separation of Au and Pt from aqueous effluents. The influence of acid concentration on extraction yield is evaluated. The anion-exchange mechanism of Au(III), Pt(II) and Pt(IV) was confirmed. Reductive stripping was used for the recovery of Au(III) and Pt(IV). Tf2N- based ionic liquids show an excellent recovery of Au(III) using thiourea as back-extractant.

Here is just a brief introduction to this compound(16961-25-4)Recommanded Product: Hydrogen tetrachloroaurate(III) trihydrate, more information about the compound(Hydrogen tetrachloroaurate(III) trihydrate) is in the article, you can click the link below.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Pentaerythrityltetrabromide(SMILESS: BrCC(CBr)(CBr)CBr,cas:3229-00-3) is researched.Computed Properties of C6H7ClN2. The article 《Polyfunctional neopentyl ethers》 in relation to this compound, is published in Zeszyty Naukowe Uniwersytetu Jagiellonskiego, Prace Chemiczne. Let’s take a look at the latest research on this compound (cas:3229-00-3).

C(CH2Br)4 reacted with NaOC6H3ClPh-3,4 to give (BrCH2)3CCH2OC6H3ClPh-3,4, whereas reaction of pentaerythritol with 2,3-dichloroquinoxaline gave the quinoxalinone I. The products were characterized by elemental anal. and ir, uv, and NMR studies.

Here is just a brief introduction to this compound(3229-00-3)Formula: C5H8Br4, more information about the compound(Pentaerythrityltetrabromide) is in the article, you can click the link below.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Hydrogen tetrachloroaurate(III) trihydrate(SMILESS: Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+],cas:16961-25-4) is researched.Computed Properties of C10H9NO2. The article 《Rational Synthesis of Porous Graphitic-like Carbon Nitride Nanotubes Codoped with Au and Pd as an Efficient Catalyst for Carbon Monoxide Oxidation》 in relation to this compound, is published in Langmuir. Let’s take a look at the latest research on this compound (cas:16961-25-4).

The precise fabrication of efficient catalysts for CO oxidation is of particular interest in a wide range of industrial and environmental applications. Herein, a scalable method is presented for the controlled synthesis of graphitic-like porous carbon nitride nanotubes (gC3N4NTs) codoped with Au and Pd (Au/Pd/gC3N4NTs) as efficient catalysts for carbon monoxide (CO) conversion. This includes the activation of melamine with nitric acid in the presence of ethylene glycol and metal precursors followed by consecutive polymerization and carbonization. This drives the formation of porous one-dimensional gC3N4NT with an outstanding surface area of (320.6 m2 g-1) and an at.-level distribution of Au and Pd. Intriguingly, the CO conversion efficiency of Au/Pd/gC3N4NTs was substantially greater than that for gC3N4NTs. The approach thus presented may provide new avenues for the utilization of gC3N4 doped with multiple metal-based catalysts for CO conversion reactions which had been rarely reported before.

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Imidazole – Wikipedia,
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