Category: 21876-43-7

Futyu, Julia; Ispan, David; Feher, Csaba; Szegedi, Agnes; Juzsakova, Tatjana; Hancsok, Jeno; Skoda-Foldes, Rita published the artcile< Recyclable supported Bronsted acidic ionic liquid catalysts with non-aromatic cations for the oligomerization of isobutene under mild conditions>, COA of Formula: C9H13NO3S, the main research area is bronsted acidic ionic liquid catalyst isobutene oilgomerization jet fuel.

Bronsted acidic ionic liquids with different type of cations (pyridinium, morpholinium, pyrrolidinium, imidazolium), N-sulfoalkyl chain length and different anions (triflate, hydrogensulfate and tetrafluoroborate) were prepared and immobilized on silica by adsorption. The ionic liquids were characterised by NMR and IR. Surface properties and Bronsted/Lewis acidity of the supported catalysts were also determined Their catalytic activity and recyclability were compared in the oligomerisation of isobutene to obtain products that can be used as jet fuel blending components after hydrogenation. The results proved that imidazolium ionic liquids can be replaced by less toxic non-aromatic versions without any loss in their activity and stability. By the introduction of shorter sulfoalkyl chain into the cation, excellent results could be obtained even under milder conditions (lower temperature and shorter reaction time). Catalytic activity was shown to correlate to the Bronsted acidity of the catalyst.

Molecular Catalysis published new progress about Jet aircraft fuels. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, COA of Formula: C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Xiaolong; An, Hualiang; Zhang, Hongqi; Zhao, Xinqiang; Wang, Yanji published the artcile< n-Butyraldehyde Self-Condensation Catalyzed by Sulfonic Acid Functionalized Ionic Liquids>, Synthetic Route of 21876-43-7, the main research area is butyraldehyde self condensation sulfonic acid functionalized ionic liquid catalyst.

Self-condensation of n-butyraldehyde to 2-ethyl-2-hexenal is one of the important processes for the industrial production of 2-ethylhexanol. In the present work, several sulfonic acid functionalized ionic liquids (SFILs) were synthesized. Their acid strengths were determined by the Hammett method combined with UV-vis spectroscopy, and their catalytic performances in n-butyraldehyde self-condensation were investigated. The results show that the conversion of n-butyraldehyde correlated well with the acid strength of the SFILs with the same cation. The SFILs with triethylammonium cations showed a better catalytic performance than those with imidazolium cations or pyridinium cations, and [HSO3-b-N(Et)3]p-TSA (“”b””, butyl) exhibited the highest selectivity. Under the optimal reaction conditions of the mass ratio of [HSO3-b-N(Et)3]p-TSA to n-butyraldehyde = 0.1, reaction temperature = 393 K, and reaction time = 6 h, the conversion of n-butyraldehyde was 89.7% and the selectivity to 2-ethyl-2-hexenal was 87.8%. [HSO3-b-N(Et)3]p-TSA could be reused four times without a significant loss in its catalytic performance. A kinetic anal. result showed that this is a reversible second-order reaction. Compared with the kinetic parameters from the reaction catalyzed by an aqueous base or acid catalyst, the pre-exponential factor is lower due to the restriction of the high viscosity of [HSO3-b-N(Et)3]p-TSA. Finally, a possible reaction mechanism for n-butyraldehyde self-condensation catalyzed by [HSO3-b-N(Et)3]p-TSA was proposed.

Industrial & Engineering Chemistry Research published new progress about Acidity. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Synthetic Route of 21876-43-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Serrano-Ruiz, Juan Carlos; Campelo, Juan M.; Francavilla, Matteo; Romero, Antonio A.; Luque, Rafael; Menendez-Vazquez, Carmen; Garcia, Ana B.; Garcia-Suarez, Eduardo J. published the artcile< Efficient microwave-assisted production of furfural from C5 sugars in aqueous media catalyzed by Broensted acidic ionic liquids>, SDS of cas: 21876-43-7, the main research area is ionic liquid xylose hydrolysis dehydration catalyst furfural microwave.

Small amounts of SO3H-functionalized room temperature synthesized ionic liquids efficiently dehydrate aqueous xylose to furfural under microwave heating at mild reaction conditions. The RT-ionic liquid catalysts were also found to be effective catalysts for the two step one-pot simultaneous hydrolysis and dehydration of a lignocellulosic waste biorefinery-derived syrup enriched in C5 sugar oligomers.

Catalysis Science & Technology published new progress about Bronsted acidity. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, SDS of cas: 21876-43-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Schuster, Georg; Lindner, Wolfgang published the artcile< Comparative characterization of hydrophilic interaction liquid chromatography columns by linear solvation energy relationships>, Related Products of 21876-43-7, the main research area is hydrophilic interaction liquid chromatog column linear solvation energy relationship; acid organic hydrophilic interaction LC linear solvation energy relation; base organic hydrophilic interaction LC linear solvation energy relation.

Twenty-two com. available and home-made stationary phases with different surface modifications were compared under hydrophilic interaction liquid chromatog. (HILIC) conditions. The column set comprised neutral, basic, acidic, zwitterionic and mixed surface modifications. Retention data of 68 differently structured test solutes were acquired to generate retention models based on a linear solvation energy relation (LSER) approach. A recently modified solvation parameter model with two addnl. mol. descriptors was evaluated in terms of its universal applicability when electrostatic forces are enabled in addition to predominant partition phenomena. The suggested method could not be confirmed to be a standardized way to characterize HILIC systems when different operating conditions are applied. However, the significant contribution of the recently introduced charge descriptors (D- and D+) on explaining the interactions within HILIC systems was confirmed. The solvation parameter model is a useful tool in column development, to affirm or dismiss the preceding educated guess on how certain immobilized ligands will behave. Acidic modified surfaces (stationary phases) exhibit a very small hydrogen bond acceptor property and are less versatile when it comes to an even distribution of solutes along the retention window. Also, basic and neutral columns are more preferable for HILIC applications and might explain why only a limited variety of strong acidic modified HILIC columns, although found in literature, are available com.

Journal of Chromatography A published new progress about Electrostatic force. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Related Products of 21876-43-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Parvanak Boroujeni, Kaveh; Shojaei, Pegah published the artcile< Poly(4-vinylpyridine)-supported dual acidic ionic liquid: an environmentally friendly heterogeneous catalyst for the one-pot synthesis of 4,4'-(arylmethylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ols)>, Formula: C9H13NO3S, the main research area is sulfobutylpyridinium sulfate as catalyst Knoevenagel condensation Michael addition.

A poly(4-vinylpyridine)-supported Bronsted ionic liquid was easily prepared from its starting materials and used as a novel, highly efficient, and reusable heterogeneous catalytic system for the synthesis of 4,4′-(arylmethylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ol derivatives) by a condensation reaction between aromatic aldehydes and 2 equiv of 3-methyl-l-phenyl-5-pyrazolone. The synthesis of the target compound (catalyst) was achieved by a reaction of 1,2-oxathiane 2,2-dioxide (1,4-butanesultone) with 4-Vinylpyridine divinylbenzene copolymer and a subsequent anion exchange. The catalyst thus formed was a polymer-supported 1-(4-sulfobutyl)pyridinium sulfate ionic liquid The reaction products thus formed included 4,4′-(phenylmethylene)bis[3-methyl-1-phenyl-1H-pyrazol-5-ol] derivatives, a furan derivative [4,4′-[(2-furanyl)methylene]bis[3-methyl-1-phenyl-1H-pyrazolo-5-ol]], a thiophene derivative [4,4′-[(2-thienyl)methylene]bis[3-methyl-1-phenyl-1H-pyrazolo-5-ol]].

Turkish Journal of Chemistry published new progress about Addition reaction. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Formula: C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Song; Tian, Chengcheng published the artcile< Polyvinylpolypyrrolidone supported Bronsted acidic catalyst for esterification>, Electric Literature of 21876-43-7, the main research area is polyvinylpolypyrrolidone support Bronsted acidic catalyst esterification.

A polyvinylpolypyrrolidone (PVPP) supported Bronsted acidic catalyst ([PVPP-BS]HSO4) was prepared by coupling SO3H functionalized polyvinylpolypyrrolidone with H2SO4 in this work. After the characterization through FT-IR, FESEM, TG, BET, and elemental anal., it was found that 1,4-butane sultone (BS) and sulfuric acid reacted with PVPP and were immobilized on PVPP surface. The prepared [PVPP-BS]HSO4 catalyst shows high catalytic activity for a series of esterification reactions and could be separated from the reacted mixture easily. Moreover, this catalyst could be recycled and reused for six times without significant loss of catalytic performance.

International Journal of Polymer Science published new progress about Esterification. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Electric Literature of 21876-43-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Sun, Suqun; He, Min; Dai, Yuanwei; Li, Xin; Liu, Zhijun; Yao, Li published the artcile< Catalytic acetalization: an efficient strategy for high-value utilization of biodiesel-derived glycerol>, Formula: C9H13NO3S, the main research area is biodiesel derived glycerol acetalization ester sulfatefunctionalized ionic liquid catalyst.

In this study, an efficient process for high value utilization of biodiesel-derived glycerol was proposed via a simple reaction of acetalization catalyzed by novel catalysts of ester sulfatefunctionalized ionic liquids (ILs). The relationship between the IL structure and its catalytic activity was investigated. The effects of reaction conditions, and the substrate adaptability, were also carefully studied. The results demonstrate that ester sulfate-functionalized IL shows excellent catalytic activity on the acetalization of glycerol with aldehyde (ketone).Under the optimized condition, 87% glycerol conversion was obtained with 99% acetal selectivity when glycerol was condensed with cyclohexanone. In particular, 29% of product consists of six-membered compound, an important fine chem. and an excellent precursor in organic chem., because of the significant steric-hindrance effect of IL catalyst. Furthermore, the IL catalyst shows good recyclability where insignificant activity loss was exhibited even after six runs.

Catalysts published new progress about Acetalization. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Formula: C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Blumbergs, Peter; Ash, Arthur B.; Daniher, F. A.; Stevens, Calvin Lee; Michel, H. O.; Hackley, B. E. Jr.; Epstein, J. published the artcile< Alkylating agents containing a quaternary nitrogen group>, Category: pyridine-derivatives, the main research area is alkylating sulfonates; sulfonates alkylating; pyridinium sulfonates.

A series of 18 new, water-soluble alkylating agents was synthesized. The structures contain an alkylsulfonate group as the alkylating function and a quaternary ammonium salt group attached to a hydrocarbon backbone. Some pyridinium sulfonates perchlorates were also prepared

Journal of Organic Chemistry published new progress about 21876-43-7. 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gui, Jianzhou; Cong, Xiaohui; Liu, Dan; Zhang, Xiaotong; Hu, Zhide; Sun, Zhaolin published the artcile< Novel Bronsted acidic ionic liquid as efficient and reusable catalyst system for esterification>, Product Details of C9H13NO3S, the main research area is Bronsted acidic ionic liquid efficient reusable catalyst system esterification.

Under mild conditions and without any addnl. organic solvent, esterification of alcs. by carboxylic acids could be carried out in three new halogen-free Bronsted acidic ionic liquids, 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate, 1-(4-sulfonic acid) butylpyridinium hydrogen sulfate and N-(4-sulfonic acid)butyl triethylammonium hydrogen sulfate. Especially for esterification of ethanol by acetic acid, good conversion rate and high selectivity were obtained, and the liquid esters formed a sep. phase that was decanted. The ionic liquid could be reused after removal of water under vacuum.

Catalysis Communications published new progress about Bronsted acids Role: CAT (Catalyst Use), USES (Uses) (catalyst). 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Product Details of C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Senapak, W.; Saeeng, R.; Jaratjaroonphong, J.; Kasemsuk, T.; Sirion, U. published the artcile< Green synthesis of dipyrromethanes in aqueous media catalyzed by SO3H-functionalized ionic liquid>, Application of C9H13NO3S, the main research area is dipyrromethane green synthesis aldehyde pyrrole ionic liquid catalyst.

A mild, efficient and metal-free method was described for the green synthesis of dipyrromethanes from aldehydes and unsubstituted pyrrole catalyzed by SO3H-functionalized ionic liquids (SO3H-ILs) in aqueous media at room temperature Notably, SO3H-ILs, 1-butylsulfonic-3-methylimidazolium hydrogen sulfate ([bsmim][HSO4]) was the most efficient catalyst for moderate to good yields of the corresponding desired products.

Organic & Biomolecular Chemistry published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 21876-43-7 belongs to class pyridine-derivatives, and the molecular formula is C9H13NO3S, Application of C9H13NO3S.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem