Tag: M.W=200-250

Neef, C. J. published the artcileMEH-PPV: Improved Synthetic Procedure and Molecular Weight Control, Quality Control of 146370-51-6, the publication is Macromolecules (2000), 33(7), 2311-2314, database is CAplus.

Mechanistic studies on the polymerization of α,α’-dibromo-2-methoxy-5-(2-ethylhexyloxy)xylene have been performed. Polymerizations were initially carried out by adding potassium tert-butoxide to monomer in the presence of a chain transfer agent, anthracene. Anthracene showed little effect on the mol. weight of the resulting polymer, suggesting that the major polymerization route was not radically initiated. Polymerizations were also carried out by adding monomer to potassium tert-butoxide in presence of a nucleophile, 4-methoxyphenol. The mol. weight of the resulting polymer scaled linearly with the amount of 4-methoxyphenol, suggesting an anionic mechanism. In addition, each polymerization was monitored by in-situ torque measurements to further elucidate the polymerization mechanism and optimize polymerization conditions.

Macromolecules 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, Quality Control of 146370-51-6.

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

Neef, C. J. published the artcileMEH-PPV: improved synthetic procedure and molecular weight control. [Erratum to document cited in CA132:308756], HPLC of Formula: 146370-51-6, the publication is Macromolecules (2004), 37(7), 2671, database is CAplus.

In Table 2 on page 2313, the polydispersity (PD) values for the polymerizations using 1.05 and 2.0% 4-methoxyphenol are listed as 1.52 and 1.14, resp. The correct PD values are 1.14 for 1.0% 4-methoxyphenol and 1.52 for 2.0% 4-methoxyphenol. The corrected table is given. The corrected values show a clear relation between the amount of 4-methoxyphenol and polymerization yield, mol. weights, and PD values.

Macromolecules 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, HPLC of Formula: 146370-51-6.

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

Furst, Hans published the artcileAlkylamino pyridines and alkyl pyridine ethers. (Relations between chemical constitution and odor.), Category: ethers-buliding-blocks, the publication is Chemische Technik (Leipzig, Germany) (1958), 693-9, database is CAplus.

The synthesis of alkylandnopyridines and alkyl pyridine ethers was reported. In all cases below are given in parentheses, n²⁰_D, b.p./mm., and odor, if any, resp. 2-(Substituted amino)-pyridines were prepared by the method of Sharp (C.A. 34, 1663⁸) in 30-70% yield (substituents given: iso-Bu (1.5328, 69°/2, mignonette); n-hexyl (-,111°/2, strong mignonette); phenylethyl (-, 158°/3, weak mignonette); Et, Bu (1.5251, 125°/2, strong salicylic, ester); ethyl, n-decyl (1.5085, 132°/2, weak); ethyl, benzyl (1.5947, 112°/2, weak mignonette). 2-Methyl-6-(substituted amino)pyridine derivatives were prepared from 2-methyl-6-aminopyridine by the Tschitschibabin procedure in 80% yields: Bu (1.5329, 82°/2, earthy); iso-Am (1.5170, 91°/2, penetrating); n-hexyl (1.5205, 108°/2, weak mignonette); Et, Bu (1.5195, 85°/1, earthy); n-Pr, Bu (1.5153, 90°/1, weak mignonette); n-hexyl, Bu (1.5063, 112°/1, weak earthy). Also prepared were 2,6-Pr(PrBuN)C₅H₃N (1.5142, 90°/1, burnt), and 2,6-Bu(PrBuN)C₅H₃N (1.5138, 104°/1, burnt). 3-Methyl-6-(substituted amino)pyridine derivatives, in about 80% yields, were prepared according to the method of Stuart: Bu (1.5351, 74°/2, mignonette); n-hexyl (1.5250, 98/2, woody); benzyl (-, 122°/2, earthy, m. 76°); Et, Bu (1.5129, 72°/1, weak mignonette). 4-Methyl-6-(substituted amino)pyridine derivatives were prepared from 4-methyl-6-aminopyridine: Bu(-, 82°/2, flowery, m. 41°); iso-Bu (1.5348, 75°7/2, rooty); benzyl (-, -, weak mignonette, m. 76°); Et, Bu (1.5197, 82°/1, weak mignonette). 2-Pyridyl alkyl ethers were prepared from 2-bromopyridine and the alcs. in 60% yields (alkyl given): n-hexyl (1.4878, 73°/2, fruity); n-heptyl (1.4850, 83°/2, pleasant); isoöctyl (1.4825, 85°/2, fruity); cyclohexyl (1.5242, 65°/2, -). 2-Alkyl-6-pyridyl alkyl ethers were prepared from the corresponding ethers, NaNH₂, and the alkyl halides in 70% yields: 2-(n-butyl)-6-pyridyl, n-hexyl (1.5186, 72°/0.5, burnt); 2-(n-amyl)-6-pyridyl, n-heptyl (1.5123, 85°/0.5, celery); 2-isohexyl-6-pyridyl, n-amyl (1.4900, 98°/0.5, weak elder); 2-(n-nonyl)-6-pyridyl, n-amyl (1.4859, 130°/0.5, weak elder). 2-Methyl-6-(R-substituted)pyridine derivatives (R = alkyl or aryl) were prepared from 2,6-dimethylpyridine and R halide plus NaNH₂: Am (1.4869, 69°/2, rooty); n-hexyl (1.4867, 79°/2, rooty); n-heptyl (1.4854, 89/2, pea-like); cyclohexyl (1.5185, 75°/2, fatty); benzyl (1.5644, 94°/2, fruity). 2-Methyl-6-alkyl-pyridines were also prepared as above: isohexyl (1.4858, 52°/2, rooty), n-heptyl (1.4820, 65°/2, pealike); n-nonyl (1.4826, 85°/2, fatty); and phenylethyl (1.5679, 91°/2, fruity and leafy).

Chemische Technik (Leipzig, Germany) 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, Category: ethers-buliding-blocks.

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

Chiesi Villa, A. published the artcileCrystal and molecular structure of α,α’-dithiobisformamidinium dichloride, Quality Control of 14807-75-1, the publication is Acta Crystallographica, Section B: Structural Crystallography and Crystal Chemistry (1972), 28(Pt. 2), 356-60, database is CAplus.

The crystal structure of α,α’-dithiobisformamidinium dichloride, [SC(NH2)22Cl2, was determined and refined by Fourier and least-squares methods using 3-dimensional x-ray data collected with a single-crystal diffractometer (Cu Kα). The unit-cell parameters are: a 8.78(1), b 10.52-(1), c 19.69(1) Å; Z 8. Space group: Pbca. All the H atoms were located directly. The dithiobisformamidinium cation is in a general position and is formed by 2 planar thiourea groups which are slightly rotated with respect to the S-S bond [2.017-(2) Å] : (SCNN)ƛ(SSC) = 6.9 and 15.6°. The internal rotation angle around the S-S bond is 92.3°. Bond distances and angles in the thiourea groups agree with those found in thiourea and its derivatives A comparison is made of the corresponding dithiobis-formamidinium dibromide and diiodide. Packing is determined by a system of H bonds of the type N-H…Cl [3.132(5), 3.181(6), 3.120(5), 3.142(6), 3.145(6), 3.150(6) Å].

Acta Crystallographica, Section B: Structural Crystallography and Crystal 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, Quality Control of 14807-75-1.

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

Arora, Vinay published the artcileSolvent-Free N-Alkylation and Dehydrogenative Coupling Catalyzed by a Highly Active Pincer-Nickel Complex, Recommanded Product: N-(4-Methoxybenzyl)pyridin-2-amine, the publication is Organometallics (2020), 39(11), 2162-2176, database is CAplus.

The synthesis and characterization of a pincer-Ni complex (^iPr2NNN)NiCl₂(MeCN) is reported here. The authors demonstrated the utility of this pincer-Ni complex (0.02 mol % and 0.002 mol %) for the catalytic N-alkylation of amines using various alcs. Under solvent-free conditions, while the highest yield (âˆ?0%) was obtained for alkylation of 2-amino pyridine with naphthyl-1-methanol, excellent turnovers (34000 TONs) was observed for alkylation of 2-amino pyridine with 4-methoxy benzyl alc. To demonstrate the synthetic utility of these systems, high yield reactions (up to 98%) were probed for representative substrates with a higher loading of the pincer-Ni catalyst (4 mol %). DFT studies indicate that while β-hydride elimination is the RDS for alc. dehydrogenation, the N-alkylated product can be formed either via hydrogenation with a rate-determining σ-bond metathesis or by alcoholysis that has imine insertion as RDS. All the corresponding resting states were observed by HRMS(ESI) anal. The labeling experiments are also complementary to DFT studies and show evidence for the involvement of benzylic C-H bond in RDS with a k_CHH/k_CHD of âˆ?.5. This method was applied to accomplish efficient (2000 TONS) dehydrogenative coupling leading to various benzimidazoles.

Organometallics 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, Recommanded Product: N-(4-Methoxybenzyl)pyridin-2-amine.

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

Sarkar, Sougata published the artcileRedox-Switchable Copper(I) Metallogel: A Metal-Organic Material for Selective and Naked-Eye Sensing of Picric Acid, Application of Formamidine disulfide dihydrochloride, the publication is ACS Applied Materials & Interfaces (2014), 6(9), 6308-6316, database is CAplus and MEDLINE.

Thiourea (TU), a com. available laboratory chem., has been discovered to introduce metallogelation when reacted with copper(II) chloride in aqueous medium. The chem. involves the reduction of Cu(II) to Cu(I) with concomitant oxidation of thiourea to dithiobisformamidinium dichloride. The gel formation is triggered through metal-ligand complexation, i.e., Cu(I)-TU coordination and extensive hydrogen bonding interactions involving thiourea, the disulfide product, water, and chloride ions. Entangled network morphol. of the gel selectively develops in water, maybe for its superior hydrogen-bonding ability, as accounted from Kamlet-Taft solvent parameters. Complete and systematic chem. analyses demonstrate the importance of both Cu(I) and chloride ions as the key ingredients in the metal-organic coordination gel framework. The gel is highly fluorescent. Again, exclusive presence of Cu(I) metal centers in the gel structure makes the gel redox-responsive and therefore it shows reversible gel-sol phase transition. However, the reversibility does not cause any morphol. change in the gel phase. The gel practically exhibits its multiresponsive nature and therefore the influences of different probable interfering parameters (pH, selective metal ions and anions, selective complexing agents, etc.) have been studied mechanistically and the results might be promising for different applications. Finally, the gel material shows a highly selective visual response to a commonly used nitroexplosive, picric acid among a set of 19 congeners and the preferred selectivity has been mechanistically interpreted with d. functional theory-based calculations

ACS Applied Materials & Interfaces 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, Application of Formamidine disulfide dihydrochloride.

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

Wild, Andreas published the artcileAnthracene- and thiophene-containing MEH-PPE-PPVs: Synthesis and study of the effect of the aromatic ring position on the photophysical and electrochemical properties, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2009), 47(9), 2243-2261, database is CAplus.

This contribution reports on the synthesis and characterization of thiophene- (P1, P2, and P3) and anthracene- (P4 and P5) containing PPE-PPV [poly(phenylene-ethynylene)-poly(phenylenevinylene)] copolymers. The thermostable, soluble and film-forming polymers were fully characterized by NMR, IR and elemental anal.; they exhibit high molar masses with polydispersity indexes below 2.5. The position of the thiophene in the polymeric backbone has insignificant influence on the spectroscopic properties of the polymers. In contrast, the anthracene-containing polymers reveal position dependent optical properties. A constant bathochromic shift of 50 nm was observed going from P4, where anthracene is surrounded by two double bonds, to P5, where anthracene is at the bridge between a triple bond and a double bond, as well as from P5 to P6 where anthracene is surrounded by two triple bonds. This correlates to the decrease of the observed anthracene band around 255 nm going from P4 through P5 to P6, amounting to the degree of contribution of the anthracene unit to the main chain conjugation. The phenomenon known as CN-PPV effect was observed in the case of P4 [Φ_f (solution) = 3%, Φ_f (solid) = 13%]. Electrochem. studies carried out under absolute inert conditions revealed lower electrochem. band gap energies, E_g^ec, than E_g^opt. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2243-2261, 2009.

Journal of Polymer Science, Part A: Polymer Chemistry 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 C10H16BNO2, Safety of 1-((2-Ethylhexyl)oxy)-4-methoxybenzene.

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

Lin, King-Fu published the artcileOrigin of the methylene bonds in poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] prepared according to Gilch’s method: novel applications, Formula: C15H24O2, the publication is Polymer International (2006), 55(8), 938-944, database is CAplus.

Impurities containing methylene bridges between 2-((2′-ethylhexyl)oxy)-5-methoxy-benzene mols. are inevitably formed during the synthesis of 1,4-bis(chloromethyl)-2-((2′-ethylhexyl)oxy)-5-methoxy-benzene, the monomer used in the preparation of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH-PPV), but they can be removed by double recrystallization of the monomer prior to polymerization When impurities containing methylene bridges participate in a Gilch polymerization, the methylene bonds formed in the main chains are prone to break at 200 °C, i.e., at least 150 °C below the major degradation temperature of defect-free MEH-PPV. Interestingly, the thermal treatment used to break the methylene bonds bonds present reduces the chain aggregation of MEH-PPV during film formation and induces its blends with poly(2,3-diphenyl-5-octyl-p-phenylene-vinylene) (DPO-PPV) to form a morphol. similar to that of block copolymers. Both significantly enhance the luminescence properties.

Polymer International 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, Formula: C15H24O2.

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

Rochette, Etienne published the artcileIsodesmic C-H Borylation: Perspectives and Proof of Concept of Transfer Borylation Catalysis, Formula: C11H17BO3S, the publication is Journal of the American Chemical Society (2019), 141(31), 12305-12311, database is CAplus and MEDLINE.

The potential advantages of using arylboronic esters as B source in the C-H borylation are discussed. The concept is showcased by using com. available 2-mercaptopyridine as a metal-free catalyst for the transfer borylation of heteroarenes, using arylboronates as borylation agents. The catalysis shows a unique functional group tolerance among C-H borylation reactions, tolerating notably terminal alkene and alkyne functional groups. The computational study of the mechanism is also described.

Journal of the American Chemical Society 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, Formula: C11H17BO3S.

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

Resta, Claudio published the artcileConsequences of Chirality on the Aggregation Behavior of Poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV), Synthetic Route of 146370-51-6, the publication is Macromolecules (Washington, DC, United States) (2014), 47(15), 4847-4850, database is CAplus.

Poly[2-methoxy-5(2′-ethylhexoxy)-p-phenylenevinylene] (MEH-PPV) has been for the first time prepared and fully characterized in enantiopure (R) form. If the polymer mol. weight is sufficiently low, (R)-MEH-PPV assumes a helical supramol. structure in the solution aggregates, with consequences on the tendency to aggregation and on the fluorescence quenching, both of which are reduced with respect to the racemic analog.

Macromolecules (Washington, DC, United States) 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, Synthetic Route of 146370-51-6.

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