Category: 112-63-0

Galaverna, Gianni; Panto, Francesco; Dossena, Arnaldo; Marchelli, Rosangela; Bigi, Franca published the artcile< Chiral separation of unmodified α-hydroxy acids by ligand exchange HPLC using chiral copper(II) complexes of (S)-phenylalaninamide as additives to the eluent>, Computed Properties of 112-63-0, the main research area is phenylalaninamide copper hydroxy acid liquid chromatog; hydroxy acid chiral separation HPLC copper.

Copper(II) complexes of (S)-phenylalaninamide have been successfully used for the direct enantiomeric separation of unmodified (R,S)-α-hydroxy acids in reversed phase HPLC. The effect of various parameters (pH, eluent polarity, selector concentration) on enantioselectivity is discussed. Evidence is provided that a mechanism of ligand exchange is actually occurring during the chromatog. separation The method is very convenient and easy to use, and the chiral selector is com. available and can be recovered at the end of the anal. A conventional achiral RP-ODS-2 column is used and no pretreatment of the samples is required. This method allows the accurate determination of the enantiomeric excess of α-hydroxy acids in synthetic and biol. samples.

Chirality published new progress about Hydroxycarboxylic acids Role: ANT (Analyte), ANST (Analytical Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hao, Lin; Du, Yu; Lv, Hui; Chen, Xingkuan; Jiang, Huishen; Shao, Yaling; Chi, Yonggui Robin published the artcile< Enantioselective Activation of Stable Carboxylate Esters as Enolate Equivalents via N-Heterocyclic Carbene Catalysts>, SDS of cas: 112-63-0, the main research area is chiral NHC catalyst enantioselective activation carboxylate ester enolate equivalent; unsaturated imine enantioselective cycloaddition carboxylate ester enolate NHC catalyst.

The first N-heterocyclic carbene (NHC) mediated activation of stable carboxylate esters to generate enolate intermediates is disclosed. The catalytically generated arylacetic ester enolates undergo diastereo- and enantioselective [4 + 2]-cycloaddition reactions with α,β-unsaturated imines.

Organic Letters published new progress about Carboxylic esters Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation) (arylacetic esters). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Labbe, Gerrit; Leurs, Stefan published the artcile< Intramolecular cycloaddition-elimination reactions of 4-methyl-5-substituted imino-Δ2-1,2,3,4-thiatriazolines>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is methyliminothiatriazoline preparation intramol cycloaddition elimination; thiadiazole fused.

4-Methyl-1,2,3,4-thiatriazolin-5-imines I (R = H, n = 0; R2 = CH:CHCH:CH, n = 0, 1) thermolyze smoothly to give, after loss of nitrogen, fused 1,2,4-thiadiazole derivatives II.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about Cycloaddition reaction, intramolecular. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Rentzsch, Christoph F.; Tosh, Evangeline; Herrmann, Wolfgang A.; Kuehn, Fritz E. published the artcile< Iridium complexes of N-heterocyclic carbenes in C-H borylation using energy efficient microwave technology: influence of structure, ligand donor strength and counter ion on catalytic activity>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is chlorocyclooctadieneiridium reaction ethanolate azolium salt anion exchange; arene borylation microwave catalyst bridged unbridged NHC iridium cationic; bridged unbridged cationic NHC iridium preparation catalyst borylation arene; pinacol benzene boronate preparation catalyst cationic NHC iridium.

Bridged and unbridged N-heterocyclic carbene (NHC) ligands were metalated with [Ir(COD)Cl]2 to give Ir(I) mono- and biscarbene substituted catalysts [Ir(COD)NHC(Cl)] and [Ir(COD)(NHC)2][X] (X: I, PF6, BF4, CF3COO, OTf). The prepared NHC-complexes were tested in the C-H borylation reaction of aromatic carbons with bis(pinacolato)diboron (B2pin2) and pinacolborane (HBpin). The use of microwave technol. in this study not only facilitates a time efficient screening of a wide range of influences such as ligand σ-donor strength and structural motif as well as the effects of the complex counterion, but also provides an energy efficient heating source. Catalyst (η4-1,5-cyclooctadiene)(1,1′-methyl-3,3′-propylene-diimidazol-2,2′-diylidene)iridium(I) trifluoroacetate (6TFA), which features a chelating NHC ligand, proved to be the most effective catalyst and further studies with this complex in the borylation of mono- and disubstituted benzene derivatives exploring chemo- and regioselectivity were undertaken.

Green Chemistry published new progress about Acidity. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Kukkonen, Esa; Lahtinen, Elmeri; Myllyperkio, Pasi; Haukka, Matti; Konu, Jari published the artcile< Nonlinear optical properties of diaromatic stilbene, butadiene and thiophene derivatives>, Product Details of C19H34O2, the main research area is diarom stilbene butadiene thiophene synthesis nonliner optical property; mol crystal structure.

Series of highly polar stilbene, diphenylbutadiene and phenylethenylthiophene derivatives were prepared via Horner-Wadsworth-Emmons method with a view to produce new and efficient materials for second harmonic generation (SHG) in the solid-state. The single-crystal X-ray structures of compounds reveal extensive polymorphism and a peculiar photodimerization of the 2-chloro-3,4-dimethoxy-4′-nitrostilbene derivative to afford two polymorphs of tetra-aryl cyclobutane. The stilbene congeners 2-chloro-3,4-dimethoxy-4′-nitrostilbene, 5-bromo-2-hydroxy-3-nitro-4′-nitrostilbene and 4-dimethylamino-4′-nitrostilbene, as well as 4′-fluoro-4”-nitro-1,4-diphenyl-1,3-butadiene present the ideal, non-centrosym. arrangement of the chromophores for nonlinear optical (NLO) activity. Compounds I and II exhibit only relatively low intensity for second harmonic generation (0.04 and 0.18 times that of urea reference, resp.), while the stilbene polymorph 1a·non-centro shows NLO activity of over 32 times that of urea. In addition, the conjugated diarom. compounds 1-3 display fluorescence behavior in CH2Cl2 solutions with the exception of stilbene derivative I.

New Journal of Chemistry published new progress about Absorption spectroscopy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mukherjee, Kallol; Grimblat, Nicolas; Sau, Somratan; Ghosh, Koushik; Shankar, Majji; Gandon, Vincent; Sahoo, Akhila K. published the artcile< Kinetic resolution of sulfur-stereogenic sulfoximines by Pd(II)-MPAA catalyzed C-H arylation and olefination>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is alkenylative heteroaryl enabled sulfoximine enantioselective preparation; racemic sulfoximine alkene palladium MPAA catalyst alkenylative kinetic resolution; arylative heteroaryl enabled sulfoximine enantioselective preparation; arylboronic ester sulfoximine palladium MPAA catalyst arylative kinetic resolution.

A direct Pd(II)-catalyzed kinetic resolution of heteroaryl-enabled sulfoximines through an ortho-C-H alkenylation/arylation of arenes was developed. The coordination of sulfoximine pyridyl-motif and chiral amino acid MPAA ligand to Pd(II)-catalyst controlled enantio-discriminating C(aryl)-H activation. This method provided access to a wide range of enantiomerically enriched unreacted aryl-pyridyl-sulfoximine precursors and C(aryl)-H alkenylation/arylation products in good yields with high enantioselectivity (up to >99% ee), and selectivity factor up to >200. The coordination preference of directing group, ligand effect, geometry constraints and transient six-membered concerted-metalation-deprotonation species dictate stereoselectivity; DFT studies validated this hypothesis.

Chemical Science published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ton, Stephanie J.; Neumann, Karoline T.; Noerby, Peter; Skrydstrup, Troels published the artcile< Nickel-Mediated Alkoxycarbonylation for Complete Carbon Isotope Replacement>, SDS of cas: 112-63-0, the main research area is isotopically labeled aliphatic methyl carboxylate preparation; alkyl iodide alkoxycarbonylation nickel complete carbon isotope replacement.

In this paper, authors disclose a direct synthetic route allowing for full carbon isotope replacement via a nickel-mediated alkoxycarbonylation. Employing a nickel(II) pincer complex ([(N2N)Ni-Cl]) in combination with carbon-13 labeled CO, alkyl iodide, sodium methoxide, photocatalyst, and blue LED light, it was possible to generate the corresponding isotopically labeled aliphatic Me carboxylates in good yields. Furthermore, the developed methodol. was applied to the carbon isotope substitution of several pharmaceutically active compounds, whereby complete carbon-13 labeling was successfully accomplished. It was initially proposed that the carboxylation step would proceed via the in situ formation of a nickellacarboxylate, generated by CO insertion into the Ni-alkoxide bond. However, preliminary mechanistic investigations suggest an alternative pathway involving attack of an open shell species generated from the alkyl halide to a metal ligated CO to generate an acyl Ni(III) species. Subsequent reductive elimination involving the alkoxide eventually leads to carboxylate formation. An excess of the alkoxide was essential for obtaining a high yield of the product. In general, the presented methodol. provides a simple and convenient setup for the synthesis and carbon isotope labeling of aliphatic carboxylates, while providing new insights about the reactivity of the N2N nickel pincer complex applied.

Journal of the American Chemical Society published new progress about Aliphatic compounds Role: SPN (Synthetic Preparation), PREP (Preparation) (Me carboxylates). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Vijeta, Arjun; Casadevall, Carla; Roy, Souvik; Reisner, Erwin published the artcile< Visible-Light Promoted C-O Bond Formation with an Integrated Carbon Nitride-Nickel Heterogeneous Photocatalyst>, Reference of 112-63-0, the main research area is visible light carbon nitride nickel photocatalyst bond formation; carbon nitride; cross-coupling reaction; dual catalysis; heterogeneous catalysis; photocatalysis.

Ni-deposited mesoporous graphitic carbon nitride (Ni-mpg-CNx) is introduced as an inexpensive, robust, easily synthesizable and recyclable material that functions as an integrated dual photocatalytic system. This material overcomes the need of expensive photosensitizers, organic ligands and additives as well as limitations of catalyst deactivation in the existing photo/Ni dual catalytic cross-coupling reactions. The dual catalytic Ni-mpg-CNx is demonstrated for C-O coupling between aryl halides and aliphatic alcs. under mild condition. The reaction affords the ether product in good-to-excellent yields (60-92%) with broad substrate scope, including heteroaryl and aryl halides bearing electron-withdrawing, -donating and neutral groups. The heterogeneous Ni-mpg-CNx can be easily recovered from the reaction mixture and reused over multiple cycles without loss of activity. The findings highlight exciting opportunities for dual catalysis promoted by a fully heterogeneous system.

Angewandte Chemie, International Edition published new progress about Coupling reaction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Gomi, Tsutomu; Nozaki, Miwako; Takeda, Tohoru; Umeda, Tokuo; Takahashi, Kazutoshi; Nakajima, Masahiro published the artcile< Comparison of chest dual-energy subtraction digital tomosynthesis and dual-energy subtraction radiography for detection of pulmonary nodules: initial evaluations in human clinical cases.>, Related Products of 112-63-0, the main research area is Tomosynthesis; dual-energy subtraction; pulmonary nodules.

RATIONALE AND OBJECTIVES: To compare initial evaluations of chest dual-energy subtraction digital tomosynthesis (DES-DT) and dual-energy subtraction radiography (DES-R) for detection of pulmonary nodules. MATERIALS AND METHODS: DES-DT and DES-R systems with pulsed x-rays and rapid kV switching were used to evaluate pulmonary nodules (>4-6 mm, 2 nodules; >6-8 mm, 2 nodules; >8 mm, 32 nodules). Multidetector computed tomography was used as a reference. A filtered back-projection algorithm was used to reconstruct low-voltage (60 kVp), high-voltage (120 kVp), and soft-tissue or bone-subtracted tomograms of the desired layer thicknesses from the image data acquired during a single tomographic scan. DES-R images were processed from the low- and high-voltage images. To detect the pulmonary nodules, we used both systems to examine 36 patients with and 36 patients without pulmonary nodules. Two radiologists and three doctors of pulmonary medicine (average experience, 18 years) performed receiver operating characteristic (ROC) curve analysis to evaluate the results. RESULTS: The ROC analysis results suggested that the detection ability was significantly better for DES-DT than for DES-R (P < .0001; 95% confidence interval: DES-DT, 0.94 [0.83-0.99]; DES-R, 0.76 [0.68-0.85]; sensitivity: DES-DT, 87.7 ± 2.9%; DES-R, 53.8 ± 3.5%; specificity: DES-DT, 78.3 ± 5.6%; DES-R, 78.4 ± 3.4%; accuracy: DES-DT, 83.1 ± 3.8%, DES-R, 66.1 ± 2.0%). When the nodules were no longer superimposed over the normal structures, their characteristics and distribution could be observed much more clearly. CONCLUSION: Compared with DES-R, DES-DT provided greater sensitivity for detection of pulmonary nodules, particularly for the larger ones. Academic radiology published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yang, Xiao-Guang; Du, Feng-Huan; Li, Jun-Jie; Zhang, Chi published the artcile< Late-Stage Dehydroxyazidation of Alcohols Promoted by Trifunctional Hypervalent Azido-Iodine(III) Reagents>, Computed Properties of 112-63-0, the main research area is alkyl alc azido iodine reagent chemoselective dehydroxyazidation; azidoalkane preparation; alcohol; azide; click reaction; hypervalent iodine; late-stage functionalization.

A practical method for dehydroxyazidation of alcs. via an SN2 pathway involving PPh3 and trifunctional benziodazolone-based hypervalent azido-iodine(III) reagents, which function as an electrophilic center, an azido source and a base was reported. This mild, chemoselective method was used for late-stage azidation of structurally complex alcs., as well as for a new synthetic route to the antiepileptic drug rufinamide. The reaction mechanism was also investigated both exptl. and computationally.

Chemistry – A European Journal published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics