Month: December 2022

Liang, Dongdong published the artcileA Metal-Free Tandem Demethylenation/C(sp²)-H Cycloamination Process of N-Benzyl-2-aminopyridines via C-C and C-N Bond Cleavage, Product Details of C13H14N2O, the publication is Organic Letters (2013), 15(13), 3476-3479, database is CAplus and MEDLINE.

A mild, metal-free synthesis of pyrido[1,2-a]benzimidazoles starting with N-benzyl-2-aminopyridines, which employs PhI(OPiv)₂ as a stoichiometric oxidant, has been developed. The process is initiated by an unusual PhI(OPiv)₂-mediated ipso S_EAr reaction, followed by solvent-assisted C-C and C-N bond cleavage.

Organic Letters 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, Product Details of C13H14N2O.

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

Akherati, Ali published the artcileDilution and photooxidation driven processes explain the evolution of organic aerosol in wildfire plumes, Formula: C8H10O2, the publication is Environmental Science: Atmospheres, database is CAplus.

Wildfires are an important atm. source of primary organic aerosol (POA) and precursors for secondary organic aerosol (SOA) at regional and global scales. However, there are large uncertainties surrounding the emissions and physicochem. processes that control the transformation, evolution, and properties of POA and SOA in large wildfire plumes. We develop a plume version of a kinetic model to simulate the dilution, oxidation chem., thermodn. properties, and microphysics of organic aerosol (OA) in wildfire smoke. The model is applied to study the in-plume OA in four large wildfire smoke plumes intercepted during an aircraft-based field campaign in summer 2018 in the western United States. Based on estimates of dilution and oxidant concentrations before the aircraft first intercepted the plumes, we simulate the OA evolution from very close to the fire to several hours downwind. Our model results and sensitivity simulations suggest that dilution-driven evaporation of POA and simultaneous photochem. production of SOA are likely to explain the observed evolution in OA mass with phys. age. The model, however, substantially underestimates the change in the oxygen-to-carbon ratio of the OA compared to measurements. In addition, we show that the rapid chem. transformation within the first hour after emission is driven by higher-than-ambient OH concentrations (3 x 10⁶-10⁷ mols. per cm³) and the slower evolution over the next several hours is a result of lower-than-ambient OH concentrations (<10⁶ mols. per cm³) and depleted SOA precursors. Model predictions indicate that the OA measured several hours downwind of the fire is still dominated by POA but with an SOA fraction that varies between 30% and 56% of the total OA. Semivolatile, heterocyclic, and oxygenated aromatic compounds, in that order, were found to contribute substantially (>90%) to SOA formation. Future work needs to focus on better understanding the dynamic evolution closer to the fire and resolving the rapid change in the oxidation state of OA with phys. age.

Environmental Science: Atmospheres 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, Formula: C8H10O2.

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

Lue, Xiaodan published the artcileSynthesis and photoluminescence properties of poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene-co-styrene) copolymers, COA of Formula: C15H24O2, the publication is Polymer Science, Series A (2011), 53(5), 403-408, database is CAplus.

A series of conjugated and non-conjugated copolymers of poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene-co-styrene) were synthesized via a typical chlorine precursor route. The obtained copolymers were characterized by FTIR spectra, UV-Vis spectra, ¹H NMR, and GPC. The results obtained indicated that the introduction of non-conjugated PS segments in MEH-PPV led to the interruption of conjugation structure and shortened the effective conjugated length, by which the optical properties of the conjugated polymer can be adjusted.

Polymer Science, Series A 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 C15H24O2, COA of Formula: C15H24O2.

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

Fan, Ju-di published the artcileAnalysis on the chemical compounds of essential oil from Centipeda minima in Guizhou by simultaneous distillation and extraction method, Synthetic Route of 2944-47-0, the publication is Anhui Nongye Kexue (2009), 37(15), 6986-6987, 6991, database is CAplus.

The objective of this study was to explore the chem. composition of essential oil from Centipeda min. (L) A.Br.et Aschers in Guizhou and provide the basis for its further exploitation and utilization. The essential oil of C. min. was extracted by simultaneous distillation and extraction and analyzed by gas chromatog.-mass spectrometry. The relative contents of each component in the essential oil were obtained by normalization of peak areas. Results show that 55 compositions were identified which added up to96.45% in the essential oil. It was concluded that the main compositions of essential oil from C. min. were trans-chrysanthenyl acetate (62.46%) and beta-bisabolene(4.69%), thymol (3.88%),verbenol(3.03%), 1,1,5,6,6,9,9-heptamethyl-10-methylene-spiro[2.7]dec-4-ene and carvacrol(2.57%).

Anhui Nongye Kexue published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, Synthetic Route of 2944-47-0.

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

Cao, Ying published the artcileSmart anticorrosive epoxy coating based on environmental-stimuli-responsive copolymer assemblies for controlled release of corrosion inhibitors, Related Products of ethers-buliding-blocks, the publication is Macromolecular Materials and Engineering (2022), 307(7), 2100983, database is CAplus.

Inspired by the various applications of self-assembled amphiphilic polymers in aqueous solution, a novel ”semi-amphiphilic” copolymer is designed, which can self-assemble in organic systems by taking advantage of the compatibility difference between epoxy and the units with different structures in the polymer chains. A novel kind of polymer, poly(syringaldehyde methacrylate)-co-poly(dopamine methacrylate) is prepared by reversible addition-fragmentation chain transfer polymerization, which contains aldehyde groups and is further used to prepare the polymer/guanine conjugate by forming the Schiff base. The polymer/guanine conjugate is semi-amphiphilic, since the compatibility between dopamine methacrylate unit and epoxy is better than that between syringaldehyde methacrylate and epoxy, and therefore assemblies are formed in the organic system when it is added into the epoxy resin to prepare the anti-corrosive coating. The imine linkage is responsible for the pH-controlled release of the corrosion inhibitors, namely guanine, from the core of the assemblies. The self-assembled behaviors of the semi-amphiphilic copolymer in epoxy are investigated by dynamic light scattering and SEM. The stable encapsule and controlled-release of the inhibitors are confirmed by UV spectrophotometry. The properties of the smart coatings are comprehensively studied.

Macromolecular Materials and Engineering 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, Related Products of ethers-buliding-blocks.

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

Wang, Yinling published the artcileCeCl₃-promoted simultaneous photocatalytic cleavage and amination of Cα-Cβ bond in lignin model compounds and native lignin, SDS of cas: 183303-74-4, the publication is CCS Chemistry (2020), 2(3), 107-117, database is CAplus.

It remains challenging to achieve valuable platform chems. from lignin because of its complicated polymeric structure and inherent inert chem. activities. So far, only a few examples have been reported for the selective cleavage of C-C bonds in lignin due to their intrinsic inertness and ubiquity. Here, we present a simple and com. available cerium(III) chloride (CeCl₃)-promoted photocatalytic depolymerization strategy to realize the simultaneous cleavage and amination of Cα-Cβ bond in a variety of lignin model compounds at room temperature This procedure does not require any pretreatments and breakdown of C-O bonds or loss of γ-CH₂OH group to generate aldehydes (up to 97%) and N-containing products (up to 95%) in good to excellent yields. Addnl., this CeCl₃-based photocatalyst system could maintain excellent catalytic performance even after 10 sequential cycles with new starting materials. Moreover, this approach realizes the precise control over the reaction via switching the external light stimuli on/off. Further, this method is effective for the depolymerization of real lignin, thus affording the corresponding cleavage and amination products of Cα-Cβ bonds.

CCS Chemistry published new progress about 183303-74-4. 183303-74-4 belongs to ethers-buliding-blocks, auxiliary class Benzene,Alcohol,Ether, name is 1-(3,4-Dimethoxyphenyl)-2-phenoxyethanol, and the molecular formula is C2H4ClNO, SDS of cas: 183303-74-4.

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

Yang, Chunhe published the artcilePolymer light-emitting electrochemical cells with 1-methoxy-4-(2-ethylhexyloxy)benzene as salt carrier, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Synthetic Metals (2001), 124(2-3), 449-453, database is CAplus.

The electro-active, 1-methoxy-4-(2-ethylhexyloxy)benzene (MEH-benzene) is employed as ion carrier and redox shuttle in the polymer light-emitting electrochem. cell (LEC). The corresponding LECs with MEH-PPV can be driven within 10 V without failure. The LEC characteristics are clearly shown by the current-voltage curves and the ac impedance spectroscopy.

Synthetic Metals 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 C7H5Br2F, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Hirao, Ichiro published the artcileCondensation of anisyl alcohol or benzyl alcohol with aromatic amines, Synthetic Route of 52818-63-0, the publication is Yakugaku Zasshi (1954), 853-5, database is CAplus.

A mixture of 7 g. p-MeOC₆H₄CH₂OH (I), 5 g. 2-aminopyridine (II), 20 g. xylene, and 4 g. KOH refluxed 21 hrs., extracted with 10% HCl, KOH added to pH 7, and the product recrystallized from dilute MeOH give 8.9 g. (80%) 2-(p-methoxybenzylamino)pyridine (III), m. 108°, or 5.5 g. I, 3.5 g. II, 8 g. PhMe, and 4 g. KOH refluxed 12 hrs. and the product treated as above give 4.8 g. (62%) III, m. 123-4°. I (7 g.), 4.7 g. PhNH₂, 20 g. xylene, and 4 g. KOH refluxed 21 hrs., and the product precipitated with 10% HCl, dissolved in KOH, and recrystallized from MeOH gives 5 g. (51%) p-MeOC₆H₄CH₂NHPh, m. 63-4°. Similarly, 20 g. PhCH₂OH, 6 g. 2-aminopyrimidine, 40 g. PhMe, and 7 g. KOH refluxed 10 hrs. give 16 g. (44%) 2-benzylaminopyrimidine, m. 79-81°; 8 g. PhCH₂OH, 6 g. 2-H₂NC₅H₄N, 4 g. PhMe, and 15 g. PhMe refluxed 13 hrs. give 11 g. (81%) 2-PhCH₂NHC₅H₄N, m. 95-6°; 10.8 g. PhCH₂OH, 9.3 g. PhNH₂, 40 g. xylene, and 8 g. KOH refluxed 21 hrs. give 1.47 g. PhCH₂NHPh.HCl, m. 214-5°.

Yakugaku Zasshi 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, Synthetic Route of 52818-63-0.

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

Shigeno, Masanori published the artcileOrganic superbase t-Bu-P4-catalyzed demethylations of methoxyarenes, Application In Synthesis of 93-04-9, the publication is Organic Chemistry Frontiers (2022), 9(14), 3656-3663, database is CAplus.

The organic superbase t-Bu-P4 catalyzes the demethylation reactions of methoxyarenes ROMe [R = 4-cyanophenyl, 1-oxo-2,3-dihydro-1H-inden-5-yl, 1-benzothiophen-5-yl, etc.] in the presence of alkanethiol and hexamethyldisilazane was reported. The system can efficiently convert a variety of substrates, including electron-deficient, -neutral, and -rich substrates and heteroaromatic substrates, and displays excellent functional group tolerance. Computational studies show that the high reactivity achieved by t-Bu-P4 is due to the formation of the nucleophilic naked thiolate species.

Organic Chemistry Frontiers published new progress about 93-04-9. 93-04-9 belongs to ethers-buliding-blocks, auxiliary class Naphthalene,Ether, name is 2-Methoxynaphthalene, and the molecular formula is C14H10O4, Application In Synthesis of 93-04-9.

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

Chernysheva, Maria V. published the artcileThe S ··· Hal and Se ··· Hal chalcogen bonding in a series of thiourea, selenourea and their derivatives, SDS of cas: 14807-75-1, the publication is Journal of Solid State Chemistry (2021), 121759, database is CAplus.

The chalcogen bonding (ChB) in a series of thiourea, selenourea and their derivatives has been investigated in the present paper. Thus, selenourea and dimethylselenourea undergo dimerization and trimerization processes in the presence of various halogen species (1-5). Selenourea and dimethylselenourea form trimers 3-4 in the presence of lighter halogens (chlorine and bromine) through Se···Se chalcogen bonding. When moving to heavier halogen (iodine), the dimers 1-2 are formed. Thiourea and its derivatives also tend to make very strong S···S bonds and form dimers in the case of lighter halogens chlorine and bromine (compounds 6-7). However, the monomers separated by the iodine species are formed upon interaction with iodine via very strong S···I bonding (compounds 9-12). Furthermore, among all the crystal structures of 1-12, only iodine cations I+ in 10 and 12 act as electron d. acceptors, while in the remaining compounds 1-9 and 11 halogen species act as electron d. donors.

Journal of Solid State Chemistry published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, SDS of cas: 14807-75-1.

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