Tag: M.W:100-200

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, Article, Proceedings of the National Academy of Sciences of the United States of America called Remarkably diastereoselective synthesis of a chiral biphenyl diphosphine ligand and its application in asymmetric hydrogenation, Author is Qiu, Liqin; Wu, Jing; Chan, Shusun; Au-Yeung, Terry T.-L.; Ji, Jian-Xin; Guo, Rongwei; Pai, Cheng-Chao; Zhou, Zhongyuan; Li, Xingshu; Fan, Qing-Hua; Chan, Albert S. C., which mentions a compound: 53562-86-0, SMILESS is C[C@H](O)CC(OC)=O, Molecular C5H10O3, Application of 53562-86-0.

Essentially complete atropdiastereoselectivity was realized in the preparation of biaryl diphosphine dioxide by asym. intramol. Ullmann coupling and oxidative coupling with central-to-axial chirality transfer. A bridged C2-sym. biphenylphosphine ligand possessing addnl. chiral centers on the linking unit of the biphenyl groups was synthesized. No resolution step was required for the preparation of the enantiomerically pure chiral ligand. These findings offer a general and practical tool for the development of previously uninvestigated atropdiastereomeric biaryl phosphine ligands. The diphosphine ligand was highly effective in the asym. hydrogenation of α- and β-keto esters, 2-(6′-methoxy-2′-naphthyl)propenoic acid, β-(acylamino)acrylates, and enol acetates.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Recommanded Product: 66-71-7. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 1,10-Phenanthroline, is researched, Molecular C12H8N2, CAS is 66-71-7, about Luminescence behavior of PMMA films doped with Tb(III) and Eu(III) complexes. Author is Knyazev, Andrey A.; Krupin, Aleksandr S.; Galyametdinov, Yuriy G..

Novel hybrid systems based on the poly(Me methacrylate) (PMMA) matrix and Eu(III) and Tb(III) tris(β-diketonates) complexes with 1,10-phenanthroline were synthesized and analyzed as light-conversion materials. Solutions of the Tb(III) and Eu(III) complexes doped into PMMA were spin-coated to fabricate films with various concentrations of luminophores. Long hydrocarbon substituents in the structure of complexes inhibit their crystallization In turn, it allows to vary the luminophore content in a polymer matrix in a broader range and achieve the maximum of emission with higher concentrations of dopants. The addition of the Tb(III) complex to the system results in a 26% increase in the relative luminescence quantum yield of the Eu(III) ions due to an addnl. energy transfer from the Tb(III) compound The results of this work illustrate that although the Eu(III) and Tb(III) complexes exhibit lower rate and efficiency of energy transfer than their well-known Tb(acac)3 and Eu(tta)3 analogs, the structural features of lanthanide complexes allow to efficiently dope a PMMA matrix with considerably larger amounts of luminophores. It offers broader application opportunities for the coordination Ln(III) compounds as polyfunctional materials for optics and optoelectronics.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Electric Literature of C5H13NO. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: (S)-1-(Dimethylamino)propan-2-ol, is researched, Molecular C5H13NO, CAS is 53636-17-2, about Rapid determination of enantiomeric excess using infrared thermography. Author is Millot, Nicolas; Borman, Phil; Anson, Mike S.; Campbell, Ian B.; Macdonald, Simon J. F.; Mahmoudian, Mahmoud.

IR thermog. (IRT) is presented as a novel technique to screen a potentially large number of asym. catalysts or substrates in a high-throughput fashion. IRT was used as a simple, rapid, and practical approach for initial screening of the substrate specificity of Candida antarctica lipase. This was carried out using a 96-well microtiter plate format. Potential advantages and limitations of IRT for the enzymic stereoselective acylation of primary and secondary alcs. of interest are discussed.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Synthetic Route of C8H8FN. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Fluoroindoline, is researched, Molecular C8H8FN, CAS is 2343-22-8, about Palladium-Catalyzed Direct and Specific C-7 Acylation of Indolines with 1,2-Diketones. Author is Xie, Guilin; Zhao, Yuhan; Cai, Changqun; Deng, Guo-Jun; Gong, Hang.

Herein, a palladium-catalyzed direct and specific C-7 acylation of indolines in the presence of an easily removed directing group was developed. This strategy usually considered as a practical strategy for the preparation of acylated indoles because indoline can be easily converted to indole under oxidation conditions. In particular, these strategy greatly improved the alkacylation yield of indolines for which only an unsatisfactory yield could be achieved in the previous studies. Furthermore, the reaction can be scaled up to gram level in the standard reaction conditions with a much lower palladium loading (1 mol %).

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

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 Synthesis of the dibenzofuran-based diphosphine ligand BIFAP and its water-soluble derivative BIFAPS and their use in ruthenium-catalyzed asymmetric hydrogenation., published in 1999-09-30, which mentions a compound: 53562-86-0, Name is (S)-Methyl 3-hydroxybutanoate, Molecular C5H10O3, Application of 53562-86-0.

The syntheses of both enantiomers of the novel diphosphine ligand 2,2′-bis(diphenylphosphino)-1,1′-bidibenzofuranyl (BIFAP) and the water-soluble analog (-)-2,2′-bis(diphenylphosphino)-1,1′-bidibenzofuranyl-8,8′-disulfonic acid dipotassium salt (BIFAPS) are reported. Advantage is taken of the very high regioselectivity in ring functionalization of the 1,1′-bidibenzofuranyl backbone. These ligands were used in the Ru-catalyzed hydrogenation of Me acetoacetate and (Z)-acetamidocinnamic acid in MeOH and H2O. In MeOH both BIFAP and BIFAPS give the products in very high enantiomeric excess. With BIFAPS in H2O a slight drop in the ee of the products is observed When BIFAPS was used with either H2O or MeOH as the solvent the addition of a small amount of acid turns out to be essential for a fast reaction and high asym. induction.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

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: 53562-86-0, is researched, Molecular C5H10O3, about Acclimatization of Baker’s Yeast for Asymmetric Reduction at High Substrate Concentration, the main research direction is Saccharomyces stereoselective reduction acclimatization high substrate.HPLC of Formula: 53562-86-0.

By gradually adding a low content of Me acetoacetate into a solid medium, a new yeast strain, called MAA yeast, was separated from com. baker’s yeast. The new yeast was used for catalyzing asym. reduction of Me acetoacetate in the aqueous phase, and results showed that it was more efficient than regular baker’s yeast in the asym. reduction of Me acetoacetate. The influence of external environment, pH, and temperature on MAA yeast was the same as on baker’s yeast. The yield of Me β-hydroxybutanoate with the new strain was about 13% higher than with baker’s yeast at 0.05 M Me acetoacetate. Similar results were also obtained in experiments, when MAA yeast was used to catalyze other systems, such as reducing Et 4-chloro-3-oxobutanoate to (S)-4-chloro-3-hydroxybutanoate and reducing Et acetoacetate to Et (S)-3-hydroxybutyrate. In addition, the main product was (S)-Me β-hydroxybutanoate at low substrate concentration; however, (R)-Me β-hydroxybutanoate would be obtained when the concentration of substrate exceeded 0.4 M. The morphol. of the new strain is the same as that of baker’s yeast.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

HPLC of Formula: 54903-09-2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 6-Acetylbenzo[d]oxazol-2(3H)-one, is researched, Molecular C9H7NO3, CAS is 54903-09-2, about Friedel-Crafts acylation of 2(3H)-benzoxazolone: investigation of the role of the catalyst and microwave activation. Author is Liacha, Messaoud; Yous, Said; Poupaert, Jacques H.; Depreux, Patrick; Aichaoui, Hocine.

To study the scope and limitations of the use of complexed species of AlCl3 in Friedel-Crafts reactions, we investigated the acetylation and benzoylation of 2(3H)-benzoxazolone and 3-methyl-2(3H)-benzoxazolone varying the amide complexing agent. We replaced DMF by N-methylformamide, dimethylacetamide, pyrrolidinone, N-methylpyrrolidinone, tetramethylurea, and DMSO. However, there was no particular advantage of substituting DMF by another amide ligand. This can probably be ascribed to the fact that the complex formed between AlCl3 and the complexing agent becomes too stable. Alternatively, a route using polyphosphoric acid and microwave activation was explored. The major advantage of running the reaction in a microwave oven was that a good yield was reached in a rather short period of time.

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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1,10-Phenanthroline(SMILESS: C1=CC3=C(C2=NC=CC=C12)N=CC=C3,cas:66-71-7) is researched.Related Products of 15418-29-8. The article 《Improved singlet oxygen generation in rhenium(I) complexes functionalized with a pyridinyl selenoether ligand》 in relation to this compound, is published in Polyhedron. Let’s take a look at the latest research on this compound (cas:66-71-7).

The synthesis, characterization, electrochem. and photophys. properties of three novel polypyridine rhenium(I) complexes coordinated to an organoselenide ligand, 4-(phenylseleno)-pyridine (PhSepy), and structurally related polypyridine ligands, fac-[Re(CO)3(NN)(PhSepy)]+ NN = 1,10-phenanthroline (phen), 4,7-diphenyl-1,10-phenanthroline (ph2phen) and pyrazino[2,3-f]-1,10-phenanthroline (dpq), are reported. In addition, their ability to act as a photosensitizer agent for the generation of singlet oxygen was investigated. Cyclic and differential pulse voltammetry experiments showed an overlap of the redox waves characteristic of the 4-(phenylseleno)-pyridine ligand and the Re(I) complex. This finding is consistent with a strong contribution of the pyridine-based ligand on the HOMO levels of the three investigated complexes, further supported by quantum mech. calculations Moreover, the lowest energy band observed in the absorption spectra of the complexes was also influenced by the organoselenide ligand, with a combination of the usual MLCTRe→NN transition with a ligand-to-ligand charge transfer (LLCT) one. The three complexes showed typical emission spectra for this class of compounds ascribed to 3MLCTRe→NN, with excellent quantum yields for the singlet oxygen generation (ΦΔ = 0.65-070). Remarkably, these are significantly larger (15-29%) than those for structurally related complexes with non-functionalized pyridyl ligands, revealing a significant ability as a photosensitizer agent. Therefore, authors envisage this work to be of interest to those engaged in the development of novel rhenium(I) complexes for optoelectronic applications.

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Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics

Recommanded Product: 2343-22-8. 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: 5-Fluoroindoline, is researched, Molecular C8H8FN, CAS is 2343-22-8, about Ruthenium-Catalyzed Dehydrogenation Through an Intermolecular Hydrogen Atom Transfer Mechanism. Author is Huang, Lin; Bismuto, Alessandro; Rath, Simon A.; Trapp, Nils; Morandi, Bill.

The direct dehydrogenation of alkanes is among the most efficient ways to access valuable alkene products. Although several catalysts have been designed to promote this transformation, they have unfortunately found limited applications in fine chem. synthesis. Here, we report a conceptually novel strategy for the catalytic, intermol. dehydrogenation of alkanes using a ruthenium catalyst. The combination of a redox-active ligand and a sterically hindered aryl radical intermediate has unleashed this novel strategy. Importantly, mechanistic investigations have been performed to provide a conceptual framework for the further development of this new catalytic dehydrogenation system.

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Piperazine – Wikipedia,
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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: 6-Acetylbenzo[d]oxazol-2(3H)-one, is researched, Molecular C9H7NO3, CAS is 54903-09-2, about 6-Alkylbenzoxazolinones. Chemical and pharmacodynamic studies.Related Products of 54903-09-2.

Eleven title compounds (I; R1 = Me or H; R2 = Me, Ph, benzyl, CH2Cl, CH2Br, or CHBrM4) were prepared by a general method consisting of reduction of the corresponding 6-acyl derivatives (OCR2) with Et3SiH in F3CCO2H medium. Yields were 50-90%, with no side products. Six I were screened in mice for acute toxicity and for analgesic and psychotropic activities. At 200 mg/kg, orally, these compounds had lower analgesic activity than the reference substance, 6-benzoylbenzoxazolinone; at 100 mg/kg, only 6-ethylbenzoxazolinone  [93771-18-7] was more active, but this analgesic activity was accompanied by a psychotropic component. Furthermore, this psychotropic activity was found with almost all the I at the dose of 200 mg/kg, a component which was not present in the previously studied carbonyl (6-acyl) analogs.

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