Tag: M.W=100-150

Zelenka, Jan published the artcileFlavinium Catalysed Photooxidation: Detection and Characterization of Elusive Peroxyflavinium Intermediates, Name: 1,3-Dimethoxybenzene, the main research area is peroxyflavinium intermediate detection flavinium photooxidation; flavin; ion spectroscopy; mass spectrometry; peroxy intermediates; photooxidation.

Flavin-based catalysts are photoactive in the visible range which makes them useful in biol. and chem. Herein, we present electrospray-ionization mass-spectrometry detection of short-lived intermediates in photooxidation of toluene catalyzed by flavinium ions (Fl+). Previous studies have shown that photoexcited flavins react with aromatics by proton-coupled electron transfer (PCET) on the microsecond time scale. For Fl+, PCET leads to FlH.+ with the H-atom bound to the N5 position. We show that the reaction continues by coupling between FlH.+ and hydroperoxy or benzylperoxy radicals at the C4a position of FlH.+. These results demonstrate that the N5-blocking effect reported for alkylated flavins is also active after PCET in these photocatalytic reactions. Structures of all intermediates were fully characterized by isotopic labeling and by photodissociation spectroscopy. These tools provide a new way to study reaction intermediates in the sub-second time range.

Angewandte Chemie, International Edition published new progress about Atomic charge. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Name: 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Wang, Qiuyue published the artcileLow-Temperature Catalytic Hydrogenolysis of Guaiacol to Phenol over Al-Doped SBA-15 Supported Ni Catalysts, Recommanded Product: 1,3-Dimethoxybenzene, the main research area is temperature catalytic hydrogenolysis guaiacol phenol aluminum supported nickel catalyst.

Selective hydrogenolysis of aromatic carbon-oxygen (Caryl-O) bonds is a key strategy for the generation of aromatic chems. from lignin. However, this process is usually operated at high temperatures and pressures over hydrogenation catalysts, resulting in a low selectivity for aromatics and an extra consumption of hydrogen. Here, a series of Al-doped SBA-15 mesoporous materials with different Si/Al molar ratios (Al-SBA-15) were prepared via a post-synthesis method using NaAlO2 as the Al source, and then Al-SBA-15 supported Ni catalysts (Ni/Al-SBA-15) were prepared by a deposition-precipitation method using urea as the hydrolysis reagent. The prepared supports and catalysts were extensively characterized using various techniques such as XRD, N2 adsorption/desorption, TEM, 27Al NMR, NH3-TPD, XPS, H2-TPR, and pyridine-FT-IR, and the catalysts were evaluated in the hydrogenolysis of the Caryl-O bond in guaiacol and lignin derived compounds under mild conditions. The effects of the Si/Al ratio in catalyst and reaction parameters on guaiacol conversion and product distribution were investigated in detail, associated with solvent effect. The incorporation of Al into the framework of SBA-15 can improve the Lewis acidity and the dispersion of the supported Ni particles and yet modulate the metal-support interactions, which are propitious to the hydrogenolysis of the Caryl-O bond in guaiacol. The catalyst Ni/Al-SBA-15 with a Si/Al molar ratio of 10 shows the best performance with a guaiacol conversion of 87.4% and a phenol selectivity of 76.9% under the mild conditions conducted, because of its proper acidity, suitable metal-support interactions, and high dispersion of the active species. The present study would stimulate research and development in multi-functional catalysts for the generation of valuable chems. from biomass.

ChemCatChem published new progress about Hydrogenolysis. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Recommanded Product: 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Jiang, Xiaolin published the artcileTetracoordinate borates as catalysts for reductive formylation of amines with carbon dioxide, HPLC of Formula: 5961-59-1, the main research area is tetracoordinate borates catalyst amine reductive formylation carbon dioxide.

We report sodium trihydroxyaryl borates as the first robust tetracoordinate organoboron catalysts for reductive functionalization of CO2. These catalysts, easily synthesized from condensing boronic acids with metal hydroxides, activate main group element-hydrogen (E-H) bonds efficiently. In contrast to BX3 type boranes, boronic acids and metal-BAr4 salts, under transition metal-free conditions, sodium trihydroxyaryl borates exhibit high reactivity of reductive N-formylation toward a variety of amines (106 examples), including those with functional groups such as ester, olefin, hydroxyl, cyano, nitro, halogen, MeS-, ether groups, etc. The over-performance to catalyze formylation of challenging pyridyl amines affords a promising alternative method to the use of traditional formylation reagents. Mechanistic investigation supports electrostatic interactions as the key for Si/B-H activation, enabling alkali metal borates as versatile catalysts for hydroborylation, hydrosilylation, and reductive formylation/methylation of CO2.

Green Chemistry published new progress about Binding energy. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, HPLC of Formula: 5961-59-1.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Bukhtiyarova, M. V. published the artcileCu layered double hydroxides as catalysts for N-methylation of p-anisidine: Influence of synthesis conditions, Quality Control of 5961-59-1, the main research area is copper layered double hydroxide catalyst methylation anisidine methylanisidine.

Cu-containing layered double hydroxides were synthesized by co-precipitation method using base solution (NaOH and Na2CO3) with different concentration of carbonate ions. The influence of the precipitating agent concentration on formation of hydrotalcite phase was investigated. Characterization of the surface of the obtained samples calcined at 450 °C and 650 °C was performed by XPS. Catalysts based on Cu-layered double hydroxides were investigated in N-methylation of p-anisidine by methanol obtaining N-methyl-p-anisidine using autoclave reactor. Effect of precipitating agent concentration during synthesis of the Cu-layered double hydroxide on the catalyst performance was studied.

Catalysis Communications published new progress about Binding energy. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Quality Control of 5961-59-1.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hao, Yining published the artcileEffect of static-state fermentation on volatile composition in rapeseed meal, Safety of 4-Methoxy-N-methylaniline, the main research area is rapeseed meal volatile composition static state fermentation; Tetramethylpyrazine; fermentation; rapeseed meal; volatile components.

BACKGROUND : Fermented rapeseed meal has been used as an alternative protein source for animal feed, but the volatile compounds and how their contents change during fermentation have not been reported. To clarify the effect of static-state fermentation on its aroma, the volatile compounds of rapeseed meal during different stages of fermentation were analyzed using an electronic nose system and headspace solid-phase microextraction-gas chromatog.-mass spectrometry. RESULTS : The results suggested that the volatile compounds in the raw rapeseed meal, mostly hydrocarbons and some aldehydes, were lost. The levels of the volatile compounds resulting from microbial metabolism, especially pyrazines, greatly increased during fermentation Nonanal was the dominant volatile measured in the headspace of raw rapeseed meal. However, the volatile compounds found at high concentrations in rapeseed meal after 5 days of fermentation were tetramethylpyrazine, followed by butanoic acid, benzenepropanenitrile, 2-methylbutanoic acid, trimethylamine, 2,3,5-trimethyl-6-ethylpyrazine, and 2,3,5-trimethylpyrazine. CONCLUSION : The fermentation process could significantly change the composition and content of volatile compounds in rapeseed meal. The results may provide reference data for studies on the choice of fermentation period and formation mechanism of flavor substances in fermented rapeseed meal.

Journal of the Science of Food and Agriculture published new progress about Bacillus subtilis. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Safety of 4-Methoxy-N-methylaniline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Guo, Zhiqiang published the artcileCO2-tuned highly selective reduction of formamides to the corresponding methylamines, Name: 4-Methoxy-N-methylaniline, the main research area is tertiary amine preparation; methylated formamide reduction carbon oxygen bond cleavage dioxide.

Herein an efficient, CO2-tuned and highly selective C-O bond cleavage of N-methylated formanilides is described. With easy-to-handle and com. available NaBH4 as the reductant, a variety of formanilides could be turned into the desired tertiary amines in moderate to excellent yields. The role of CO2 has been investigated in detail, and the mechanism is proposed on the basis of experiments

Green Chemistry published new progress about C-O bond cleavage. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Name: 4-Methoxy-N-methylaniline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Pratali Maffei, Luna published the artcileElectronic structure-based rate rules for H ipso addition-elimination reactions on mono-aromatic hydrocarbons with single and double OH/CH3/OCH3/CHO/C2H5 substituents: a systematic theoretical investigation, COA of Formula: C8H10O2, the main research area is phenol toluene substitution reaction kinetics activation energy.

The recent interest in bio-oils combustion and the key role of mono-aromatic hydrocarbons (MAHs) in existing kinetic frameworks, both in terms of poly-aromatic hydrocarbons growth and surrogate fuels formulation, motivates the current systematic theor. investigation of one of the relevant reaction classes in MAHs pyrolysis and oxidation: ipso substitution by hydrogen. State-of-the-art theor. methods and protocols implemented in automatized computational routines allowed to investigate 14 different potential energy surfaces involving MAHs with hydroxy and Me single (phenol and toluene) and double (o-,m-,p-C6H4(OH)2, o-,m-,p-CH3C6H4OH, and o-,m-,p-C6H4(CH3)2) substituents, providing rate constants for direct implementation in existing kinetic models. The accuracy of the adopted theor. method was validated by comparison of the computed rate constants with the available literature data. Systematic trends in energy barriers, pre-exponential factors, and temperature dependence of the Arrhenius parameters were found, encouraging the formulation of rate rules for H ipso substitutions on MAHs. The rules here proposed allow to extrapolate from a reference system the necessary activation energy and pre-exponential factor corrections for a large number of reactions from a limited set of electronic structure calculations We were able to estimate rate constants for other 63 H ipso addn-elimination reactions on di-substituted MAHs, reporting in total 75 rate constants for H ipso substitution reactions o-,m-,p-R’C6H4R + H â†?C6H5R + R’, with R,R’ = OH/CH3/OCH3/CHO/C2H5, in the 300-2000 K range. Addnl. calculations performed for validation showed that the proposed rate rules are in excellent agreement with the rate constants calculated using the full computational protocol in the 500-2000 K range, generally with errors below 20%, increasing up to 40% in a few cases. The main results of this work are the successful application of automatized electronic structure calculations for the derivation of accurate rate constants for H ipso substitution reactions on MAHs, and an efficient and innovative approach for rate rules formulation for this reaction class.

Physical Chemistry Chemical Physics published new progress about Activation energy. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, COA of Formula: C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Adamek, Jakub published the artcileGeneration and Reactivity of 1-Imidocarbenium Cations in the Friedel-Crafts-type Reaction, COA of Formula: C8H10O2, the main research area is generation reactivity Imidocarbenium cation Friedel Crafts reaction.

Herein, we discuss the formation and reactivity of 1-imidocarbenium cations in Friedel-Crafts-type reaction between 1-imidoalkylphosphonium salts and arenes. The observed weakening of Cα-P+ bond is described qual. and quant. The determination of rate constants and activation energies of Cα-P+ bond cleavage enabled systematic reactivity investigations of a series of phosphonium salts with different structures. Finally, the application scope for the imidoalkylation of aromatic hydrocarbons was explored. The results confirm that the generated 1-imidocarbenium cations are reactive enough to alkylate strongly activated, less-activated, or even inactivated aromatic compounds

ACS Omega published new progress about Activation energy. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, COA of Formula: C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Chan, Yuk-Cheung published the artcileHalogen-Bond-Catalyzed Addition of Carbon-Based Nucleophiles to N-Acylimminium Ions, Computed Properties of 151-10-0, the main research area is nucleophile hemiaminal ether addition iodoimidazolium; isoindoline preparation; iodoimidazolium addition catalyst.

N-acylimminium ions are an important class of synthetic intermediates to produce diverse products upon treatment with different nucleophiles. Most of the reported catalytic protocol involved moisture-sensitive Lewis acids or transition metal. Herein, an organocatalytic version by using halogen-bond catalyst as mild Lewis acid through anion-abstraction strategy, is reported. A preliminary result of enantioselective version by employing a chiral BINOL-phosphate anion has also been demonstrated.

Organic Letters published new progress about Addition reaction. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Computed Properties of 151-10-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Li, Yonglong published the artcileTunable Photocatalytic Two-Electron Shuttle between Paired Redox Sites on Halide Perovskite Nanocrystals, Formula: C8H10O2, the main research area is tunable photocatalytic two electron shuttle halide perovskite nanocrystal photocatalyst.

Perovskite semiconductors as advanced solar energy-converting materials are promising catalysts for photoredox organic synthesis. Despite the high concentration of charge carriers generated on the perovskite surface, efficient utilization of these nonequilibrium and shambolic energetic carriers to trigger a chem. reaction remains a hot and challenging subject. Here, we report a photon-mediated electron shuttle between paired redox sites on perovskite nanocrystals for the reformation of highly stable carbon-halogen bonds, where both surface electrons and holes are utilized simultaneously. The photo-redox cascade can be effortlessly tailored by precise control of the surface-reducing/-oxidizing reaction rates, which unlocks the transformation for a wide range of (het)arenes. This work demonstrates colloidal perovskite photocatalysts for the direct installation of more than 10 different synthetically important functional groups onto arenes and heteroarenes.

ACS Catalysis published new progress about Adsorption energy. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Formula: C8H10O2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem