Month: December 2022

Zhou, Jun published the artcileCooperative photocatalysis of dye-TiO₂ nanotubes with TEMPO⁺BF^–₄ for selective aerobic oxidation of amines driven by green light, SDS of cas: 6850-57-3, the publication is Applied Catalysis, B: Environmental (2021), 120368, database is CAplus.

Visible light photocatalysis could offer an eco-friendly alternative for selective transformation of organic mols. Herein, a cooperative system is created with alizarin red S (ARS), TiO₂ nanotubes (TNTs), and an extra redox mediator. The electron transfer between oxidatively quenched ARS-TNTs and the redox mediator is the key to secure cooperative photocatalysis. The selective aerobic oxidation of primary and secondary amines was constructed by cooperative photocatalysis of ARS-TNTs with 2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate (TEMPO⁺BF^–₄) driven by green light. Specifically, the activity of anatase TNTs could reach about 2.2 times that of the P25 (Aeroxide P25) TiO₂ precursor. Due to increased polarity, TEMPO⁺BF^–₄ serves more efficiently for electron transfer than (2,2,6,6-tetramethylpiperidin-1-yl)oxy (TEMPO), conferring above 1.5 times of activity that of TEMPO for the selective aerobic conversion of amines. This work features the potential of designing redox mediators in amplifying cooperative photocatalysis driven by visible light.

Applied Catalysis, B: Environmental published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C23H20BN, SDS of cas: 6850-57-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Yang, Shaoxiong published the artcileModulating the Stacking Model of Covalent Organic Framework Isomers with Different Generation Efficiencies of Reactive Oxygen Species, Name: (2-Methoxyphenyl)methanamine, the publication is ACS Applied Materials & Interfaces (2021), 13(25), 29471-29481, database is CAplus and MEDLINE.

The development of a facile synthesis and controllable layer stacking approach for covalent organic frameworks (COFs) is an important issue for modulating their properties and realizing their application diversity. Herein, three COF isomers with different stacking models (eclipsed AA, staggered AB, and ABC stacking) were obtained by modulating the reaction temperature and solvent medium. Exptl. and theor. calculations show that the ABC stacking isomer obtained at room temperature is the kinetic product, while the AA stacking isomer prepared by the solvothermal method is a thermodn. product. Owing to the tautomerism involved in the reaction process, these isomers possess different ratios of enol and keto forms. Thus, they exhibit different generation efficiencies of Type I and Type II reactive oxygen species (ROS). The ABC stacking isomers could be employed as metal-free heterogeneous photocatalysts for visible-light-induced oxidation of amines to imines, owing to the highest generation efficiency of Type I ROS.

ACS Applied Materials & Interfaces published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C4H10Br2CoO2, Name: (2-Methoxyphenyl)methanamine.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Xu, Hui published the artcileDesigning fluorene-based conjugated microporous polymers for blue light-driven photocatalytic selective oxidation of amines with oxygen, Computed Properties of 6850-57-3, the publication is Applied Catalysis, B: Environmental (2021), 119796, database is CAplus.

Conjugated microporous polymers (CMPs) have been showcased with a brilliant prospect in organic semiconductor photocatalysis, attributing to accessible mol. design, chem. stability and environmental friendliness. Here, two novel fluorene-based CMPs were designed and conveniently synthesized with carbazole as an electron donor. Importantly, subtle variation of substituent at the methylene bridge (9-position) of fluorene precursor results in different performances in which di-Me substituent was proven to be more efficient than difluoro substituent for blue light photocatalysis. MFC [9,9′-(9,9-dimethyl-9H-fluorene-2,7-diyl)bis(9H-carbazole)]-CMP has a much larger sp. surface area, a more favorable redox position, and resultantly a superior photocatalytic performance during blue light-driven selective oxidation of amines into imines with oxygen (O₂) in an environmentally benign solvent ethanol (C₂H₅OH). This work suggests that subtle tweaking in electron acceptors could give rise to superior photocatalytic activity for CMPs in selective chem. conversions.

Applied Catalysis, B: Environmental published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C4H6N2, Computed Properties of 6850-57-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cao, Maoyu published the artcileSeasonal variations and potential sources of biomass burning tracers in particulate matter in Nanjing aerosols during 2017-2018, Quality Control of 134-96-3, the publication is Chemosphere (2022), 303(Part_2), 135015, database is CAplus and MEDLINE.

Biomass burning (BB) is an important source of atm. particulate matter and can adversely affect air quality, visibility, human health, and climate change. To study the characteristics and potential source regions of BB tracers in PM2.5, a liquid chromatog.-mass spectrometry instrument (HPLC-MS/MS) is applied in this study to develop and validate a method to determine organic tracers of BB in 397 aerosol samples. The total mean concentrations of 17 tracers measured in 2017 and 2018 were 333.32 ng m-3 and 243.45 ng m-3, resp. Among them, the concentration of levoglucosan was the highest among all the tracers, with 325.63 ng m-3 in 2017 and 237.47 ng m-3 in 2018. The BB tracers showed obvious seasonal variations characteristics, most of which were abundant in winter. However, the concentrations of 3,4-dimethoxyacetic acid and sinapinic acid were higher in summer and spring than that in the other seasons. There were obvious differences in the Potential Source Contribution Factor (PSCF) model results of the BB’s potential source area annually and in different seasons. The results of the potential source anal. showed that Beijing-Tianjin-Hebei had a great impact on the Nanjing air quality in 2017. Finally, five source factors for BB were identified based on the Pos. Matrix Factor (PMF) model, and these were cellulose, hardwood, softwood, grass, and secondary formed. During the 2 years, cellulose was the largest contributor to biomass burning. Owing to the different fire conditions each year, the contribution of the five factors to the BB tracers was also different. For example, the contribution of softwood to the BB tracers was greater in 2018 (8.4%) than in 2017 (5.2%), while the contributions of hardwood and cellulose did not change significantly.

Chemosphere published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C9H10O4, Quality Control of 134-96-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Huang, Mingzheng published the artcileComparative characterization and sensory significance of volatile compounds in Rosa roxburghii Tratt fruit from five geographic locations in Guizhou, China, Application of 1,2-Dimethoxybenzene, the publication is Flavour and Fragrance Journal (2022), 37(3), 163-180, database is CAplus.

Rosa roxburghii Tratt (Chestnut rose) is native to China where it is cultivated for its strongly aromatic hips (pseudo fruits); locally known as cili. Increasing interest in cili for food and beverage products prompted an evaluation of its aroma compounds and the influence of geog. source. Accordingly, the volatile compounds in cili from five locations in Guizhou province were analyzed by headspace-solid-phase microextraction coupled with gas chromatog.-mass spectrometry. Sixty-seven volatile compounds were identified. Principal component anal. distinguished three sample groups by geog. source. The aroma of cili juice from each location was characterized by quant. descriptive anal. using six odor descriptors. Cili aroma was predominantly sweet/fruity, floral and green, but geog. source significantly influenced the intensity of the sweet/fruity and floral notes. Odor activity analyses indicated that 40 volatile compounds contribute appreciably to the aroma of cili. Of those compounds, only ten esters, two aldehydes, one alc. and one aromatic compound were common to all regional samples. Those findings extend the range of volatiles detected in cili. These results identify those that are present in odor active amounts and provide the first evidence of the impact of geog. source on the aroma and flavor of cili.

Flavour and Fragrance Journal published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C8H10O2, Application of 1,2-Dimethoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Li, Xiaohui published the artcileEfficient and practical catalyst-free-like dehydrative N-alkylation of amines and sulfinamides with alcohols initiated by aerobic oxidation of alcohols under air, Application of N-(4-Methoxybenzyl)pyridin-2-amine, the publication is Tetrahedron (2016), 72(2), 264-272, database is CAplus.

We developed simple and practical N-alkylation reactions of amines and sulfinamides with primary and secondary alcs. by using only catalytic amounts of air as the initiator without adding any external catalysts. This method has advantages of simple conditions, easy operation, and comparatively wider scope of substrates, providing an efficient and green catalyst-free-like alc.-based dehydrative N-alkylation method. Mechanistic studies revealed that air initiated the reactions by aerobic oxidation of the alcs. to the key initiating aldehydes or ketones in the presence of bases.

Tetrahedron published new progress about 52818-63-0. 52818-63-0 belongs to ethers-buliding-blocks, auxiliary class Pyridine,Amine,Benzene,Ether, name is N-(4-Methoxybenzyl)pyridin-2-amine, and the molecular formula is C13H14N2O, Application of N-(4-Methoxybenzyl)pyridin-2-amine.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zhao, Lifeng published the artcileNovel hyperbranched poly (phenylene vinylene) s containing four arms: Synthesis, characterization and properties of photophysics, Formula: C15H24O2, the publication is Huazhong Shifan Daxue Xuebao, Ziran Kexueban (2012), 46(1), 45-48, 100, database is CAplus.

Novel PPVs derivates were designed and successfully synthesized through Gilch reaction. The reaction intermediates and polymers were characterized by ¹H NMR, GC-MS or GPC and Elemental Anal. (EA). Their optical properties, thermal properties, electrochem. properties were investigated. These polymers were soluble in common organic solvents and they have good thermal stability. The onset weights loss temperature of the three polymers were found to be 371.7, 386.6 and 391.8°C for P₁, P₂ and P₃, resp. Compared with their spectra absorption in chloroform, the absorption bands of polymers P₁, P₂ and P₃ in thin films were red-shifted. These polymers would be promising materials for luminescent materials or solar cells.

Huazhong Shifan Daxue Xuebao, Ziran Kexueban published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C3H6O2, Formula: C15H24O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wei, Juan published the artcilePhenolic compositions and antioxidant activities of Hippophae tibetana and H. rhamnoides ssp. sinensis berries produced in Qinghai-Tibet Plateau, Computed Properties of 134-96-3, the publication is Food Chemistry: X (2022), 100397, database is CAplus.

Phenolic ingredients of Hippophae tibetana (Tib) and H. rhamnoides ssp. sinensis (Rha) berry from Qinghai-Tibet Plateau were identified by Ultra Performance Liquid Chromatog.-triple Quadrupole Tandem Mass Spectrometry. Results demonstrated that both of them possessed high levels of total phenolic and flavonoid, and compared to Tib, Rha berry exhibited higher contents. Moreover, flavonols was the most predominant subclass in Rha berry, flavonols and flavanols were the two most abundant subclasses in Tib berry. Among them, rutin and narcissin were present in the most abundant amounts in Rha berry, while (-)-epigallocatechin was the richest substance in Tib berry. Furthermore, both phenolic extracts of sea buckthorn berry exhibited strong in vitro and cellular antioxidant properties. Rha berry extract exhibited much stronger effects because of its higher levels of phenolic and flavonoid profiles. This finding proved that the Rha berry could serve as a food source for better health with great potential antioxidant activity.

Food Chemistry: X published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C7H16Cl2Si, Computed Properties of 134-96-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zhao, Lifeng published the artcileNovel hyperbranched polyphenylene vinylenes with nitro group: synthesis, characterization and photophysical properties, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Huazhong Shifan Daxue Xuebao, Ziran Kexueban (2013), 47(1), 63-67, database is CAplus.

Novel PPV derivates with nitro group were designed and successfully synthesized through Gilch reaction. The reaction intermediate and polymers were characterized by ¹H NMR, GPC and Elemental Anal. (EA). The photophysics properties, thermal property, electrochem. property were investigated, these polymers are soluble in common organic solvents and they have good thermal stability. The onset weights loss temperature of polymers were 386.6, 370.4 and 397.8°C for P₁, P₂ and P₃, resp. In comparison with the solution absorption spectra, the absorption bands of polymers (P₁, P₂ and P₃) in thin films were red-shifted. These polymers may be promising materials for solar cells.

Huazhong Shifan Daxue Xuebao, Ziran Kexueban published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C10H20N2O6S2, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Hu, Weiyao published the artcileRapidly and mildly transferring anatase phase of graphene-activated TiO₂ to rutile with elevated Schottky barrier: Facilitating interfacial hot electron injection for Vis-NIR driven photocatalysis, Quality Control of 6850-57-3, the publication is Nano Research, database is CAplus.

Visible and even IR (IR) light-initiated hot electrons of graphene (Gr) catalysts are a promising driven power for green, safe, and sustainable H₂O₂ synthesis and organic synthesis without the limitation of bandgap-dominated narrow light absorption to visible light confronted by conventional photocatalyst. However, the life time of photogenerated hot electrons is too short to be efficiently used for various photocatalytic reactions. Here, we proposed a straightforward method to prolong the lifetime of photogenerated hot electrons from graphene by tuning the Schottky barrier at Gr/rutile interface to facilitate the hot electron injection. The rational design of Gr-coated TiO₂ heterojunctions with interface synergy-induced decrease in the formation energy of the rutile phase makes the phase transfer of TiO₂ support proceed smoothly and rapidly via ball milling. The optimized Gr/rutile dyad could provide a H₂O₂ yield of 1.05 mM·g^-1·h^-1 under visible light irradiation (λ â‰?400 nm), which is 30 times of the state-of-the-art noble-metal-free titanium oxide-based photocatalyst, and even achieves a H₂O₂ yield of 0.39 mM·g^-1·h^-1 on photoexcitation by near-IR-region light (âˆ?800 nm).

Nano Research published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C8H11NO, Quality Control of 6850-57-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem