Category: ethers-buliding-blocks

Zhou, Jun published the artcileExtended phenothiazines: synthesis, photophysical and redox properties, and efficient photocatalytic oxidative coupling of amines, Recommanded Product: 2-Methoxynaphthalene, the publication is Chemical Science (2022), 13(18), 5252-5260, database is CAplus and MEDLINE.

Herein authors successfully developed a ring-fusion approach to extend the conjugation length of phenothiazines and synthesized a series of novel extended phenothiazines. The intriguing π-conjugation length-dependent photophys. and redox properties of these extended phenothiazines, and their photocatalytic performance towards visible-light-driven oxidative coupling reactions of amines were systematically investigated. As compared with the conventional phenothiazine (PTZ), all the extended phenothiazines displayed reversible redox behavior and maintained a strong excited-state reduction potential as well. Consequently, phenothiazines with longer effective conjugation lengths could efficiently catalyze the oxidative coupling of amines to imines under visible-light irradiation; by comparison, the shorter PTZ could only catalyze such reactions in the presence of UV light. Moreover, one PTZ showed superior catalytic performance which can result in better yields within a shorter reaction time, and in a broad substrate scope. Finally, a direct and efficient conversion of amines to imines under sunlight in an air atm. was successfully realized. Authors believe that their study including the new phenothiazine modification methodol. and the newly developed extended phenothiazine-based photocatalysts will open up a new way to develop novel phenothiazine-based materials for optoelectronic and catalytic applications.

Chemical Science 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 C3H8N2S, Recommanded Product: 2-Methoxynaphthalene.

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

Zuend, A. published the artcileNew and extended parameterization of the thermodynamic model AIOMFAC: calculation of activity coefficients for organic-inorganic mixtures containing carboxyl, hydroxyl, carbonyl, ether, ester, alkenyl, alkyl, and aromatic functional groups, Synthetic Route of 1589-47-5, the publication is Atmospheric Chemistry and Physics (2011), 11(17), 9155-9206, database is CAplus.

We present a new and considerably extended parameterization of the thermodn. activity coefficient model AIOMFAC (Aerosol Inorganic-Organic Mixtures Functional groups Activity Coefficients) at room temperature AIOMFAC combines a Pitzer-like electrolyte solution model with a UNIFAC-based group-contribution approach and explicitly accounts for interactions between organic functional groups and inorganic ions. Such interactions constitute the salt-effect, may cause liquid-liquid phase separation, and affect the gas-particle partitioning of aerosols. The previous AIOMFAC version was parameterized for alkyl and hydroxyl functional groups of alcs. and polyols. With the goal to describe a wide variety of organic compounds found in atm. aerosols, we extend here the parameterization of AIOMFAC to include the functional groups carboxyl, hydroxyl, ketone, aldehyde, ether, ester, alkenyl, alkyl, aromatic carbon-alc., and aromatic hydrocarbon. Thermodn. equilibrium data of organic-inorganic systems from the literature are critically assessed and complemented with new measurements to establish a comprehensive database. The database is used to determine simultaneously the AIOMFAC parameters describing interactions of organic functional groups with the ions H⁺, Li⁺, Na⁺, K⁺, NH⁺₄, Mg²⁺, Ca²⁺, Cl^–, Br^–, NO^–₃, HSO^–₄, and SO^2-₄. Detailed descriptions of different types of thermodn. data, such as vapor-liquid, solid-liquid, and liquid-liquid equilibrium, and their use for the model parameterization are provided. Issues regarding deficiencies of the database, types and uncertainties of exptl. data, and limitations of the model, are discussed. The challenging parameter optimization problem is solved with a novel combination of powerful global minimization algorithms. A number of exemplary calculations for systems containing atmospherically relevant aerosol components are shown. Amongst others, we discuss aqueous mixtures of ammonium sulfate with dicarboxylic acids and with levoglucosan. Overall, the new parameterization of AIOMFAC agrees well with a large number of exptl. datasets. However, due to various reasons, for certain mixtures important deviations can occur. The new parameterization makes AIOMFAC a versatile thermodn. tool. It enables the calculation of activity coefficients of thousands of different organic compounds in organic-inorganic mixtures of numerous components. Models based on AIOMFAC can be used to compute deliquescence relative humidities, liquid-liquid phase separations, and gas-particle partitioning of multicomponent mixtures of relevance for atm. chem. or in other scientific fields.

Atmospheric Chemistry and Physics published new progress about 1589-47-5. 1589-47-5 belongs to ethers-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-Methoxypropan-1-ol, and the molecular formula is C3H8N2S, Synthetic Route of 1589-47-5.

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

Karelin, A. A. published the artcileInhibition of serum transamidinase by formamidine disulfide. Identification of the SH-group at the active site of the enzyme, Formula: C2H8Cl2N4S2, the publication is Biokhimiya (Moscow) (1972), 37(3), 652-5, database is CAplus and MEDLINE.

Formamidine disulfide (I) [14807-75-1] inhibited the activity of serum transamidinase (EC 2.1.4.1) [9027-35-4] from patients with pancreonecrosis by 50% at 10-6M and by 90% at 2.2 .tim. 10-6M. Preincubation of serum transamidinase with 1 μg trypsin [9002-07-7] increased the inhibitory effect of I. L-canavanine [543-38-4], an amidine donor which is the substrate of the reaction, efficiently protected the activity of the enzyme. Apparently, intactness of the substrate amidine binding region of the enzyme containing the essential sulfhydryl group is the main condition of the preservation of enzymic activity in the blood.

Biokhimiya (Moscow) 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, Formula: C2H8Cl2N4S2.

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

Salgado-Ramos, Manuel published the artcileSustainable and non-conventional protocols for the three-way valorisation of lignin from grape stalks, Related Products of ethers-buliding-blocks, the publication is Chemical Engineering and Processing (2022), 109027, database is CAplus.

The main goal of this work is the exploitation of the lignin fraction present in grape stalks (GS) to produce high-value-added chems. via non-conventional and sustainable means in a three-way valorisation process. Firstly, delignification using NaOH and natural deep eutectic Solvents (NaDESs), via microwave-assisted extraction (MAE), was performed using a bicomponent (choline chloride + lactic acid) and a tricomponent (choline chloride + lactic acid + glycerol) NaDES and giving engaging MAE results in terms of delignification (around 80%). The liquid fractions obtained from MAE, using NaDESs and NaOH, were analyzed, with all of them displaying promising antioxidant activity compared to the standards Subsequently, oxidation was carried out via microwave (MW) heating, with the lignins that were isolated after the delignification step mainly yielding long-chain fatty acids (LCFA), which are valuable for bio-fuel production However, when GS was used as the starting material, 16% weight of bioaroms. (mainly vanillin and syringaldehyde) was produced. Oxidation therefore provides two further pathways for the exploitation of the lignin fraction from this lignocellulosic waste.

Chemical Engineering and Processing 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

De Prins, An published the artcileSynthesis and in vitro evaluation of stabilized and selective neuromedin U-1 receptor agonists, SDS of cas: 77128-73-5, the publication is ACS Medicinal Chemistry Letters (2018), 9(5), 496-501, database is CAplus and MEDLINE.

Neuromedin U (NMU) is a multifunctional neuropeptide which is characterized by a high conservation through all species. Herein, we describe the synthesis of a novel set of NMU-analogs based on the truncated NMU-8. Through combination of previously reported modifications, an elaborate structure-activity relationship study was performed aiming for the development of peptides with an increased selectivity toward NMU receptor 1 (NMUR1). Compound (Ac-Dmt-Phe-Leu-Dmt-Arg-Pro-Arg-Asn-NH₂) possessed the highest NMUR1 selectivity (IC₅₀ = 0.54 nM, selectivity ratio = 5313) together with an increased potency (EC₅₀ = 3.7 nM), an 18% increase of the maximal effect at NMUR1, and a higher resistance against enzymic degradation as compared to the native NMU-8. The development of a potent NMUR1 agonist with extended half-life could represent an attractive tool to further unveil the role of NMUR1 in NMU signaling.

ACS Medicinal Chemistry Letters published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, SDS of cas: 77128-73-5.

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

Kulhanek, Jiri published the artcile3,4-Dinitrothiophene as a central unit of quadrupolar push-pull-push systems, Recommanded Product: 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, the publication is Chemistry of Heterocyclic Compounds (New York, NY, United States) (2017), 53(1), 46-53, database is CAplus.

A series of quadrupolar D-π-A-π-D mols. bearing methoxythiophene terminal donor and systematically enlarged/varied π-linkers, e.g., I was synthesized by employing cross-coupling and Knoevenagel reactions. 3,4-Dinitrothiophene was utilized as a central acceptor unit in quadrupolar D-π-A-π-D push-pull-push chromophores. Optical properties were studied by electronic absorption spectra. Fundamental optoelectronic properties were investigated by semiempirical PM7 calculations It was shown that by varying the p-conjugated system the longest wavelength absorption maxima could be shifted from 341 to 489 nm. The calculated HOMO-LUMO gaps were found within the range of 6.69-7.29 eV, while the second-order mol. polarizabilities could be tuned from 0.038 to 1.578 × 10-27 esu.

Chemistry of Heterocyclic Compounds (New York, NY, United States) published new progress about 596819-12-4. 596819-12-4 belongs to ethers-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Ether,Boronate Esters,Boronic acid and ester, name is 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C11H17BO3S, Recommanded Product: 2-(5-Methoxythiophen-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

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

Higashi, Lois S. published the artcileEmpirical relations between disulfide bond lengths, (nitrogen or carbon)-carbon-sulfur-sulfur torsion angles, and substituents in aromatic disulfides. Crystal and molecular structure of 3,3′-dihydroxydi-2-pyridyl disulfide, Name: Formamidine disulfide dihydrochloride, the publication is Journal of the American Chemical Society (1978), 100(26), 8101-6, database is CAplus.

In the 21 reported crystal structures of sym. disulfides whose sulfur atoms are bound to sp² carbon atoms, an empirical relationship is found between the S-S bond length and the X-C-S-S (X = C or N) torsion angle. The C-S-S-C torsion angles are generally within about 20° of 90° in those mols. In addition, it is noted that the less frequently encountered X-C-S-S angles near 90° occur only when one strongly electron-donating substituent is present in a position β to the disulfide group in each of the R groups of the RSSR mol., or when both β positions on each R group are substituted, independent of electron negativity. A relatively neutral or electron-withdrawing group in only one β position of each R group (or any substituents at any more distant positions) allows the X-C-S-S torsion angles to be near 0°, and the S-S bond, therefore, to be short. This result is supported by the crystal and mol. structure of 3,3′-dihydroxydi-2-pyridyl disulfide, which has been determined by single-crystal x-ray diffraction techniques using counter methods, and has been refined by full-matrix least-squares procedures to a final conventional R index of 0.035. The yellow monoclinic crystals form in the space group P2₁/c with a = 7.165 (1) Å,b = 7.656(1) Å,c = 19.517(3) Å,β = 96.77(1)°, and four mols. per unit cell. The average N-C-S-S torsion angle (9°) indicates that the S-S bond (2.0180(7) Å) is nearly in the plane of each pyridine ring. The C-S-S-C torsion angle is 93.2°, and the average S-C bond length is 1.782 Å. The empirical rules presented also successfully describe the 11 transition metal ion complexes involving these disulfides whose structures are known. The C-S-S-C torsion angle has a role in governing the S-S bond length, but is important only when X-C-S-S is within about 20° of 90° or when C-S-S-C deviates by about 40° or more from 90°.

Journal of the American Chemical Society 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, Name: Formamidine disulfide dihydrochloride.

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

Chen, Han published the artcileRelationship between volatile components of green pepper and its freshness, COA of Formula: C10H14O, the publication is Shipin Kexue (Beijing, China) (2016), 37(7), 66-71, database is CAplus.

Volatile components of green pepper stored in refrigerator at (4±1)°C for different periods were evaluated by head space solid-phase micro extraction-gas chromatog.-mass spectrometry (HS-SPME-GC-MS). Soluble solid content, weight loss ratio and vitamin C content and were analyzed to probe into the relationship of pepper freshness and its volatile components. The results showed that green pepper could be kept fresh at (4±1)°C for 15 days. The characteristic odor components of fresh green pepper were hexyl octanoate, (E,E)-2,4-decadienal and 3-octanone, whereas those of rotten green pepper were α-myrcene, α-phellandrene, (E)-α-famesene, 2-propenoic acid, 3-phenyl-Et ester, hexadecanoic acid, Et ester and n-decanoic acid with variation thresholds of 6.54, 13.47, 32.78, 7.74, 9.10 and 17.13 μg/L, resp. These results can provided a theor. basis for judging the freshness of pepper by changes of the volatile components and accordingly for developing smart refrigerator to monitor the freshness of green pepper.

Shipin Kexue (Beijing, China) 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, COA of Formula: C10H14O.

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

Xue, Cuihua published the artcileNovel p-phenylene-vinylene-dithienylene type copolymer: potential red-emitting materials, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Synthetic Metals (2004), 145(1), 67-73, database is CAplus.

The p-phenylene-vinylene-dithienylene type copolymers (PPV-DT) with or without cyano group on the vinylene moiety were synthesized by Wittig-Horner-Emmons reaction and palladium-catalyzed homo-coupling reaction. The photophys. and optoelectronic properties of these copolymers as potential red-emitting materials were discussed.

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 C11H8F2, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Chen, Kang published the artcileCobalt-Mediated Decarboxylative/Desilylative C-H Activation/Annulation Reaction: An Efficient Approach to Natural Alkaloids and New Structural Analogues, SDS of cas: 6850-57-3, the publication is European Journal of Organic Chemistry (2022), 2022(16), e202101355, database is CAplus.

A Co(II)-mediated decarboxylative/desilylative C-H activation/annulation reaction for the efficient synthesis of 3-arylisoquinolines has been developed [e.g., N-benzylpicolinamide + phenylpropiolic acid â†?3-phenylisoquinoline (86%) in presence of Co(OAc)₂ as catalyst, KPF₆ as additive and PEG-400 as solvent; an 80% yield was obtained using 1-phenyl-2-(trimethylsilyl)acetylene instead, under the same optimized conditions.]. Using alkynyl carboxylic acid and alkynyl silane as terminal alkyne precursors provides straightforward routes for the synthesis of natural alkaloids and novel structural analogs.

European Journal of Organic Chemistry 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, SDS of cas: 6850-57-3.

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