Month: December 2022

Cheng, Faxiang published the artcilePoly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) synthesized by bromine methylation, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Huagong Xinxing Cailiao (2010), 38(6), 49-51, database is CAplus.

Poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) was successfully synthesized using p-methoxy phenol and 1-bromo-2-ethylhexane through the reactions of etherification, bromine methylation and de-hydrogen bromide. The number average mol. weight of MEH-PPV was 5.7×10⁴. The structure of intermediates and MEH-PPV were characterized by FTIR, ¹HNMR and UV-Vis. The structure of intermediates and MEH-PPV was consistent with the reported in the literature.

Huagong Xinxing Cailiao 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, Recommanded Product: 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Chen, Xi published the artcileTuning Zr₁₂O₂₂ Node Defects as Catalytic Sites in the Metal-Organic Framework hcp UiO-66, COA of Formula: C4H10O2, the publication is ACS Catalysis (2020), 10(5), 2906-2914, database is CAplus.

Defects in metal-organic frameworks (MOFs) play important roles in MOF reactivity and catalysis. Now, we report evidence of the reactivity and the quant. characterization of the missing linker defects on the Zr₁₂O₂₂ nodes in the MOF hcp UiO-66 (these are paired Zr₆O₈ nodes bridged by OH groups) and those on the Zr₆O₈ nodes of the MOF UiO-66. The defect sites catalyze the ring-opening reactions of epoxides with alcs., and new sites formed by removal of bridging OH groups on the Zr₁₂O₂₂ nodes also participate in the catalysis. The hcp UiO-66 was synthesized from UiO-66 and from mol. precursors, and, under various synthesis conditions, the nodes incorporated acetate ligands, where linkers were missing, and the number of these ligands was controlled by the synthesis conditions. These ligands are inhibitors of the catalytic reactions, and their removal by reaction with, for example, methanol (to form, for example, Me acetate) preceded catalysis on the defect sites. The former MOF incorporated more defect sites than the latter, correspondingly being a more active catalyst. The defect sites on the Zr₁₂O₂₂ nodes are 2-6 times more active per site than those on the isolated Zr₆O₈ nodes, with the node-bridging OH groups increasing the catalytic activity of the neighboring node defect sites because new sites are formed by their removal. The results help point the way to the design and control of catalytic sites on metal oxide-like MOF nodes by tuning of the number and reactivity of the defect sites.

ACS Catalysis 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 C4H10O2, COA of Formula: C4H10O2.

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

Timofeeva, Maria N. published the artcileZeolitic Imidazolate Frameworks ZIF-8 and MAF-5 as Highly Efficient Heterogeneous Catalysts for Synthesis of 1-Methoxy-2-propanol from Methanol and Propylene Oxide, Application In Synthesis of 1589-47-5, the publication is Industrial & Engineering Chemistry Research (2019), 58(25), 10750-10758, database is CAplus.

Herein, we demonstrated that zinc zeolitic imidazolate frameworks (ZIFs) based on 2-methylimidazole (ZIF-8) and 2-ethylimidazole (MAF-5 or ZIF-14) linkers could be used as effective heterogeneous catalysts for catalytic synthesis of 1-methoxy-2-propanol (1-MP) that is widely used in industry due to its negligible toxicity as an ecofriendly solvent and as an intermediate for the synthesis of different chems. Application of these materials decreased the reaction temperature to 110 °C. 1-MP was found to be the major product, with 92.1-93.8% selectivity. The activity of MAF-5 was higher than that of ZIF-8. This difference can be explained by the high basicity of MAF-5. MAF-5 and ZIF-8 materials showed good reusability for 5 cycles in catalysis, which indicates their high potential for catalytic applications. Compared with reported catalysts, the studied ZIFs, especially MAF-5, showed not only the highest conversion of PO but also the highest selectivity for 1-MP under similar reaction conditions.

Industrial & Engineering Chemistry Research 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 C8H8O3, Application In Synthesis of 1589-47-5.

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

Allen, Meredith A. published the artcileA redox-enabled strategy for intramolecular hydroamination, Safety of (2-Methoxyphenyl)methanamine, the publication is Chemical Science (2022), 13(24), 7264-7268, database is CAplus and MEDLINE.

A process for intramol. hydroamination that uses a redox-enabled strategy relying on efficient in situ generation of hydroxylamines by oxidation, followed by Cope-type hydroamination, then reduction of the resulting pyrrolidine N-oxide. The steps were performed sequentially in a single pot, no catalyst was required, the conditions were mild, the process was highly functional group tolerant, and no chromatog. was generally required for isolation.

Chemical Science 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, Safety of (2-Methoxyphenyl)methanamine.

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

Torrens, Aidan A. published the artcileRapid and Mild Cleavage of Aryl-Alkyl Ethers to Liberate Phenols, Recommanded Product: 1,2-Dimethoxybenzene, the publication is European Journal of Organic Chemistry (2022), 2022(27), e202200570, database is CAplus.

The Piers-Rubinsztajn reaction enables rapid deprotection of aryl alkyl ethers under ambient conditions was reported. This chem. leverages tris(pentafluorophenyl)borane and silyl hydrides to convert aryl Me ethers to siloxanes, which can then be cleaved using 1 % HCl in EtOH. Authors examined 26 derivatives and routinely obtained yields >85 %, even in the presence of sterically demanding groups and complex substrate structures. Other alkyl ethers including Et, Pr, iso-Pr, tert-Bu, and benzyl groups were also easily removed.

European Journal of Organic Chemistry 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 C25H34N4O2S, Recommanded Product: 1,2-Dimethoxybenzene.

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

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, 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

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

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