Day: April 12, 2022

Related Products of 25956-17-6. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Sodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate, is researched, Molecular C18H14N2Na2O8S2, CAS is 25956-17-6, about MoS2 quantum dots for on-line fluorescence determination of the food additive allura red. Author is Coloma, Alicia; del Pozo, Maria; Martinez-Moro, Rut; Blanco, Elias; Atienzar, Pedro; Sanchez, Lorenzo; Petit-Dominguez, Maria Dolores; Casero, Elena; Quintana, Carmen.

This work presents an online fluorescence method for the allura red (AR) determination The method is based on the fluorescence quenching of dots of MoS2 because of their interaction with the non-fluorescence dye. MoS2-dots were synthesized and characterized by spectroscopic techniques and High Resolution Transmission Electronic Microscopy (HR-TEM). The simultaneous injection of the nanomaterial and the dye in a flow injection anal. system allows the determination of allura red at 1.7 x 10-6 M concentration level with a very good accuracy and precision (Er minor than 10% and RSD lower than 8%) and a sampling frequency of 180 samples per h. Moreover, the interaction fluorophore-quencher results a dynamic inhibition mechanism. The proposed methodol. was applied to the AR anal. in soft beverages and powders for gelatine preparation Colorant concentrations of 63 ± 2 mg/L (n = 3) and 0.30 ± 0.01 mg/g (n = 3) were found, resp. These results were validated by high performance liquid chromatog. technique.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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 Improved solid phase extraction for selective and efficient quantification of sunset yellow in different food samples using a novel molecularly imprinted polymer reinforced by Fe3O4@UiO-66-NH2, published in 2021-09-30, which mentions a compound: 25956-17-6, mainly applied to sunset yellow molecularly imprinted polymer food safety; Adsorption; Magnetic molecularly imprinted polymer; Metal organic framework; Sunset yellow, Application of 25956-17-6.

The overuse of synthetic dyes in food products has gradually increased in recent years, resulting food safety and human health has become a global issue. An innovative design of a magnetic molecularly imprinted polymer (Fe3O4@UiO-66-NH2@MIP) for efficient, fast, and selective determination of sunset yellow (SY) from different food products was described in this study. The absorption properties of Fe3O4@UiO-66-NH2@MIP were elucidated by adsorption kinetics, isotherms, reusability, and selectivity experiments Because of the incorporation of porous Fe3O4@UiO-66-NH2 nanocomposite into molecularly imprinted polymer an efficient nanosorbent with a short equilibrium time, a high adsorption capacity, and a good imprinting factor was finally obtained. The porous Fe3O4@UiO-66-NH2@MIP are also used for quantification of the SY. Under optimal conditions, good linearity (R2 0.9964) in the range of 1.0-120 mg L-1 and a low limit of detection (0.41 mg L-1) was observed with satisfactory recoveries (92.50-106.1%) and excellent reusability (RSD ≤ 6.6% after 12 cycles).

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Pyrazole – Wikipedia,
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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: 814-94-8, is researched, SMILESS is O=C([O-])C([O-])=O.[Sn+2], Molecular C2O4SnJournal, Inorganic Chemistry Communications called Hetero-mixed TiO2-SnO2 interfaced nano-oxide catalyst with enhanced activity for selective oxidation of furfural to maleic acid, Author is Malibo, Petrus M.; Makgwane, Peter R.; Baker, Priscilla G. L., the main research direction is titanium tin nano oxide catalyst preparation oxidation furfural; maleic acid preparation.SDS of cas: 814-94-8.

Herein authors report on the catalytic activity of hetero-mixed TiO2-SnO2 nano-oxide catalyst for the selective liquid-phase oxidation of furfural to maleic acid using H2O2 oxidant. The high surface area and strong interaction of the two oxides with modified electronic structure manifested enhanced effective oxygen vacancies, and redox activity performance of the TiO2-SnO2 catalyst for furfural oxidation reaction. The structure of the catalyst was investigated by the powder x-ray diffraction (XRD), XPS, high-resolution transition electron microscopy (HRTEM), ESR (EPR) and Brunauer-Emmett-Teller (BET) surface area analyzer techniques. The interfaced TiO2-SnO2 oxide catalyst was more catalytically active than its single counterpart SnO2 and TiO2 oxides to give a furfural conversion of 96.2% at up to 63.8% yield of maleic acid. The catalytic performance shown by TiO2-SnO2 present encouraging prospects for an economical solid metal oxide catalyst to access biobased maleic acid from renewable biomass-derived furfural.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Itoh, Toshiyuki; Takagi, Yumiko; Nishiyama, Shigenori published the article 《Enhanced enantioselectivity of an enzymatic reaction by the sulfur functional group. A simple preparation of optically active β-hydroxy nitriles using a lipase》. Keywords: methylthioacetoxybutyronitrile kinetic resolution lipase; nitrile beta hydroxy optically active.They researched the compound: 3-Hydroxy-3-phenylpropanenitrile( cas:17190-29-3 ).Computed Properties of C9H9NO. 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:17190-29-3) here.

The enantioselectivity of a lipase-catalyzed hydrolysis was improved by varying the acyl residue into the sulfur functional one, i.e. the β-(phenylthio)- or β-(methylthio)acetoxy group, from acetate or valerate to realize satisfactory resolution of β-hydroxy nitriles using lipase P (Pseudomons sp.).

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Takahashi, Kazumasa; Sasaki, Kazushige; Tanabe, Hiroaki; Yamada, Kazutoshi; Iida, Hirotada published an article about the compound: 3-Hydroxy-3-phenylpropanenitrile( cas:17190-29-3,SMILESS:N#CCC(O)C1=CC=CC=C1 ).Recommanded Product: 3-Hydroxy-3-phenylpropanenitrile. 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:17190-29-3) through the article.

The reaction of MeCN with p-anisaldehyde was studied in detail. In EtOH no reaction occurred, but in DMF, (Me2N)3PO or THF the reaction rapidly proceeded to give 2-cyano-1-(4-methoxyphenyl)-1-hydroxyethane (I) and 4-methoxycinnamonitrile (II) with total yield of 87 ∼ 95%. The yields of I and II were influenced by the reaction temperature and solvent. Prolonged treatment of MeCN with RC6H4CHO(R = H, p-MeO, p-Me2N), 2,4-(MeO)2-C6H3CHO or 3,4-(methylenedioxy)benzaldehyde under similar conditions gave β-hydroxy-β-phenylpropionitrile derivatives or cinnamonitrile derivatives Their yields were influenced by the substituents.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Quality Control of 3-Hydroxy-3-phenylpropanenitrile. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 3-Hydroxy-3-phenylpropanenitrile, is researched, Molecular C9H9NO, CAS is 17190-29-3, about Theoretical Investigation into the Mechanism of Cyanomethylation of Aldehydes Catalyzed by a Nickel Pincer Complex in the Absence of Base Additives. Author is Ariafard, Alireza; Ghari, Hossein; Khaledi, Yousef; Hossein Bagi, Amin; Wierenga, Tanita S.; Gardiner, Michael G.; Canty, Allan J..

D. functional theory was used to study the reaction mechanism of cyanomethylation of aldehydes catalyzed by nickel pincer complexes under base-free conditions. The C-bound cyanomethyl complex, which was initially thought to be the active catalyst, is actually a precatalyst, and in order for the catalytic reaction to commence, it has to convert to the less-stable N-bound isomer. The carbon-carbon bond formation then proceeds via direct coupling of the N-bound isomer and the aldehyde to give a zwitterionic intermediate with a pendant alkoxide function, which is further stabilized by hydrogen-bonding interaction with water mols. (or alc. product). The N-bound alkoxide group of the zwitterionic intermediate is subsequently substituted by MeCN via an associative mechanism, followed by deprotonation of the coordinated MeCN to afford the final product. It was found that the transition structure for the exchange reaction (substitution of MeCN for the alkoxide group) is the highest energy point on the catalytic cycle, and its energy crucially influences the catalyst efficiency. The Ni complexes ligated by bulky and weak trans-influencing pincer ligands are not appropriate catalysts for the cyanomethylation reaction due to the involvement of very-high-energy transition structures for the exchange reaction. In contrast, benzaldehydes with electron-withdrawing substituents are capable of stabilizing the exchange reaction transition structure due to the increased stability of the zwitterionic intermediate, leading to acceleration of the catalytic reaction.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Computed Properties of C13H8CuF3N2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (1,10-Phenanthroline)(trifluoromethyl)copper(I), is researched, Molecular C13H8CuF3N2, CAS is 1300746-79-5, about Trifluoromethylation of Arylsilanes with [(phen)CuCF3]. Author is Morstein, Johannes; Hou, Haiyun; Cheng, Chen; Hartwig, John F..

A method for the trifluoromethylation of arylsilanes is reported. The reaction proceeds with [(phen)CuCF3] as the CF3 source under mild, oxidative conditions with high functional-group compatibility. This transformation complements prior trifluoromethylation of arenes in several ways. Most important, this method converts arylsilanes formed by the silylation of aryl C-H bonds to trifluoromethylarenes, thereby allowing the conversion of arenes to trifluoromethylarenes. The unique capabilities of the reported method are demonstrated by the conversion of a C-H bond into a C-CF3 bond in active pharmaceutical ingredients which do not undergo this overall transformation by alternative functionalization processes, including a combination of borylation and trifluoromethylation.

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Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application of 1300746-79-5. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (1,10-Phenanthroline)(trifluoromethyl)copper(I), is researched, Molecular C13H8CuF3N2, CAS is 1300746-79-5, about Interrupting the Barton-McCombie Reaction: Aqueous Deoxygenative Trifluoromethylation of O-Alkyl Thiocarbonates. Author is Liu, Zhi-Yun; Cook, Silas P..

The site-selective trifluoromethylation of aliphatic systems remains an important challenge. A light-driven, copper-mediated trifluoromethylation of O-alkyl thiocarbonates was described for the synthesis of trifluoromethyl-alkanes. The reaction provided broad functional group tolerance (e.g., alkyne, alkene, phenol, free alcs., electron-rich and -deficient arenes), thereby offering orthogonality and practicality for trifluoromethylation. A radical organometallic mechanism was proposed.

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Pyrazole – Wikipedia,
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Name: (1,10-Phenanthroline)(trifluoromethyl)copper(I). 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: (1,10-Phenanthroline)(trifluoromethyl)copper(I), is researched, Molecular C13H8CuF3N2, CAS is 1300746-79-5, about CuO-catalyzed conversion of arylacetic acids into aromatic nitriles with K4Fe(CN)6 as the nitrogen source.

CuO was demonstrated to be effective as the catalyst for the conversion of arylacetic acids to aromatic nitriles ArCN [Ar = Ph, 2-MeC6H4, 1-naphthyl, etc.] with non-toxic and inexpensive K4Fe(CN)6 as the nitrogen source via the complete cleavage of the C≡N triple bond. The present method allowed a series of arylacetic acids including phenylacetic acids, naphthaleneacetic acids, 2-thiopheneacetic acid and 2-furanacetic acid to be converted into the targeted products in low to high yields.

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Pyrazole – Wikipedia,
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Recommanded Product: 3-Hydroxy-3-phenylpropanenitrile. 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: 3-Hydroxy-3-phenylpropanenitrile, is researched, Molecular C9H9NO, CAS is 17190-29-3, about Catalytic reduction of the nitriles of β,β-pentamethyleneglycidic, trans-β-phenylglycidic, and β-methyl-β-phenylglycidic acids on Raney nickel. Author is Martynov, V. F.; Shchelkunov, A. V..

The title nitriles I, II, and III treated with H2O2 in alk. aqueous-alc. media give the corresponding amides (IV), hydrogenated on usual-activity Raney Ni (prepared without use of pressure) give the corresponding hydroxy compounds RR1C(OH)CH2CN (V), and hydrogenated on high-activity Raney Ni (prepared under pressure) give the corresponding hydroxy amino compounds RR1C(OH)CH2CH2NH2 (VI). A mixture of 0.47 g I, 5 ml EtOH, 5 ml 2N NaOH, and 1 ml 30% H2O2 heated at 60-70° (until the evolution of O ceased) gave 0.34 g IV [(R r1 =) pentamethylene]. Similarly, 0.4 g II, 8 ml EtOH, 5 ml 2N NaOH, and 2.5 ml 30% H2 o2 gave 0.26 g IV (R = H, R1 = Ph), and 0.75 g III, 15 ml EtOH , 6 ml 2N NaOH, and 3 ml 30% H2O2 gave 0.41 g IV (R = Me, R1 = Ph). I (3.14 g) hydrogenated on 0.43 g of a com. high-activity Raney Ni catalyst in 25 ml 96% EtOH at 23°/761.8 mm 7 hr (1598 ml H absorbed), 2.8 g Ac2O added to the filtrate remaining on catalyst removal, and the mixt . stirred until the heat evolution ceased gave 1.55 g VI [(RR1 =)-pentamethylene] N-monacetyl derivative (cf. Stork, CA 55:2594h). I (2.6 g) hydrogenated on 0.31 g usual-activity Raney Ni catalyst in 20 ml 96% EtOH at 18°/758.4 mm 3 hr (443 ml H absorbed) gave 1.77 g V [(RR1 =) pentamethylene] (VII), b4 113-14°. VII treated with H2O2 as above gave VIIa. II (4.35 g) hydrogenated on 0.43 g usual-activity Raney Ni catalyst i n 15 ml 96% EtOH at 16°/759.3 mm 3 hr (693 ml H absorbed), and the mix t. treated as above gave 2.65 g V (R = H, R1 = Ph) (VIII). VIII treated with H2O2 gave PhCH(OH)CH2CONH2. III (2.73 g) hydrogenated on 0.33 g usual-activity Raney Ni catalyst in 15 ml 96% EtOH at 18°/769.2 mm 2.5 hr (388 ml H absorbed), and treated in alkali with 30% H2O2 yielded 2.26 g MeCPh(OH)CH2CONH2.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics