Month: December 2022

Molaei, Somayeh published the artcileImmobilization of cerium (IV) and erbium (III) in mesoporous MCM-41: Two novel and highly active heterogeneous catalysts for the synthesis of 5-substituted tetrazoles, and chemo- and homoselective oxidation of sulfides, Formula: C14H10O4S2, the publication is Applied Organometallic Chemistry (2019), 33(7), n/a, database is CAplus.

Two well-ordered 2D-hexagonal cerium (IV) and erbium (III) embedded functionalized mesoporous MCM-41(MCM-41@Serine/Ce and MCM-41@Serine/Er) was developed via functionalization of mesoporous MCM-41. The surface modification method was used in the preparation of serine-grafted MCM-41 and led to the development of MCM-41@Serine. The reaction of MCM-41@Serine with Ce(NH₄)₂(NO₃)₆¡¤2H₂O or ErCl₃¡¤6H₂O in ethanol under reflux led to the organization of MCM-41@Serine/Ce and MCM-41@Serine/Er catalysts. The structures of these catalysts were determined using SEM, mapping, energy-dispersive X-ray spectroscopy, Fourier transform-IR, thermogravimetric anal., X-ray diffraction, inductively coupled plasma and Brunauer-Emmett-Teller anal. These MCM-41@Serine/Ce and MCM-41@Serine/Er catalysts showed outstanding catalytic performance in sulfides oxidation and synthesis of 5-substituted tetrazoles. These catalysts can be recycled for seven repeated reaction runs without showing a considerable decrease in catalytic performance.

Applied Organometallic Chemistry published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Formula: C14H10O4S2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Molaei, Somayeh published the artcileHighly ordered mesoporous La(III)-substituted 5-oxopyrrolidine-2-carboxylic acid (Glp) immobilized on SBA-15 as a very efficient nanocatalyst for green aerobic oxidative coupling of thiols to disulfides, Name: 2,2′-Dithiodibenzoic acid, the publication is Applied Organometallic Chemistry (2020), 34(2), e5328, database is CAplus.

Selective aerobic oxidative coupling of thiols that are catalyzed by La(III)-substituted 5-oxopyrrolidine-2-carboxylic acid (Glp) immobilized on SBA-15 (SBA-15@Glp-La; SBA = Santa Barbara amorphous) was studied. Using SBA-15@Glp-La, the complete conversion was achieved at room temperature in the presence of air without producing any over-oxidized yields. SBA-15@Glp-La was prepared by post-grafting technique. 5-Oxopyrrolidine-2-carboxylic acid (Glp) condensation followed by La(III) impregnation caused this La(III)-grafted 5-oxopyrrolidine-2-carboxylic acid (Glp) to immobilize on SBA-15. This SBA-15@Glp-La catalyst shows excellent catalytic activity in the selective aerobic oxidative coupling of thiols. Effects of amount of the catalyst, polarity of the solvent, effects of substrate, and catalyst reusability were investigated. It has been observed that seven repetitive reaction cycles did not cause any appreciable loss in the catalytic activity of this catalyst. The catalyst characterization by SEM, energy-dispersive X-ray spectroscopy, X-ray diffraction, Fourier-transform IR spectroscopy, thermal gravimetric anal., transmission electron microscopy, inductively coupled plasma, elemental mapping, and N₂ adsorption-desorption is reported. The procedure developed is heterogeneous and environmentally benign.

Applied Organometallic Chemistry published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Name: 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Moeini, Nazanin published the artcileA synthesis of sulfoxides and disulfides under classical and ultrasonic conditions in presence of recoverable inorganic-organic hybrid magnetism nanocatalysts Fe₃O₄@Tryptophan-M (M: Cu, Co and Fe), Recommanded Product: 2,2′-Dithiodibenzoic acid, the publication is Polyhedron (2019), 278-286, database is CAplus.

Three inorganic-organic hybrid magnetic nanocatalysts have been reported as new catalysts for the synthesis of sulfoxides and disulfides. Also, the effect of ultrasound irradiation on the synthesis of sulfoxides and disulfides was checked. The time of reaction was reduced and the yield was improved in the ultrasonic method compared with the conventional method. Magnetic nanoparticles were used for several times without any significant change in activity. Easy synthesis, high catalytic activity, mild reaction conditions, eco-friendliness, ease of separation of the catalysts and good reusability are their advantages.

Polyhedron published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Recommanded Product: 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Paenurk, Eno published the artcileSimple and efficient visualization of aromaticity: bond currents calculated from NICS values, Synthetic Route of 191-07-1, the publication is Physical Chemistry Chemical Physics (2022), 24(15), 8631-8644, database is CAplus and MEDLINE.

Aromaticity is a fundamental concept in chem., underpinning the properties and reactivity of many organic compounds and materials. The ability to easily and accurately discern aromatic behavior is key to leveraging it as a design element, yet most aromaticity metrics struggle to combine accurate quant. evaluation, intuitive interpretability, and user-friendliness. We introduce a new method, NICS2BC, which uses simple and inexpensive NICS calculations to generate information-rich and easily-interpreted bond-current graphs. We test the quant. and qual. characterizations afforded by NICS2BC for a selection of mols. of varying structural and electronic complexity, to demonstrate its accuracy and ease of anal. Moreover, we show that NICS2BC successfully identifies ring-current patterns in mols. known to be difficult cases to interpret with NICS and enables deeper understanding of local aromaticity trends, demonstrating that our method adds addnl. insight.

Physical Chemistry Chemical Physics published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Synthetic Route of 191-07-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Fedtke, M. published the artcileOxidative inhibitors. I. Ring-alkylated aromatic amines. Preparation of ring alkylated aniline derivatives, Category: catalysis-chemistry, the publication is Journal fuer Praktische Chemie (Leipzig) (1965), 29(3-6), 259-70, database is CAplus.

tert-Bu radical was introduced into aromatic amines by heating at 200-50¡ã with isobutylene in an autoclave at maximum 100 atm. using Al, AlCl₃, or HgCl₂ as catalyst. PhNH₂ gave 41.3% p-tert-BuC₆H₄NH₂ (b₁₆ 124¡ã, n²⁰_D 1.5373; acetate m. 171¡ã; benzoate m. 169-71¡ã) and 17% 2,4- and 2,6-(Me₃C)₂C₆H₃NH₂. p-Toluidine gave 41% 2,4-Me(Me₃C)C₆H₃NH₂ (b₁ 85¡ã, n²⁰_D 1.5360; acetate m. 167%; benzoate m. 173¡ã). p-Toluidine gave 41.2% 4,2-Me(Me₃C)C₆H₃NH₂ (b₁ 81¡ã, n²⁰_D 1.5368; acetate m. 162-4¡ã) and 1.6% 4,2,6-Me(Me₃C)₂C₆H₂NH₂ (b₁ 100-20¡ã, m. 128-9¡ã). Similarly ArNMe₂ gave the following alkylated N,N-dimethylamines (alkyl, % yield, b.p. or m.p., and n²⁰_D given): p-tert-Bu, 29.3, b₁₂ 123¡ã, 1.5293; 2,6-Et₂, 79.8, b₃ 90¡ã, 1.5095; 2,6-(iso-Pr₂, 81.6, b_2.5 86¡ã, 1.5002; 2,4-(tert-Bu)₂, 35-9, m. 77-8¡ã, –; 4,2,6-MeEt₂, 78.0, b₃ 92¡ã, 1.5084; 4,2,6-Me(iso-Pr)₂, 59.1, m. 47.58.5,–.

Journal fuer Praktische Chemie (Leipzig) published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Cosgun, Sedat published the artcileEfficient synthesis of new perfluorinated or hybrid amphiphilic surfactants, HPLC of Formula: 30670-30-5, the publication is Journal of Fluorine Chemistry (2004), 125(1), 55-61, database is CAplus.

A very simple pathway for the preparation of amphiphilic analogs of natural bioactive peptidoamines such as carnosine (¦Â-alanylhistidine) or carcinine (¦Â-alanylhistamine) is presented. The strategy makes it possible to synthesize original bialkyl chain or trialkyl chain perfluorinated surfactants with or without perhydrogenated chains.

Journal of Fluorine Chemistry published new progress about 30670-30-5. 30670-30-5 belongs to catalysis-chemistry, auxiliary class Polyfluoroalkanes, name is 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluorodecan-1-amine, and the molecular formula is C10H6F17N, HPLC of Formula: 30670-30-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Di Mauro, Chiara published the artcileBuilding thermally and chemically reversible covalent bonds in vegetable oil based epoxy thermosets. Influence of epoxy-hardener ratio in promoting recyclability, Related Products of catalysis-chemistry, the publication is Materials Advances (2020), 1(6), 1788-1798, database is CAplus.

Thermoset polymers with permanently crosslinked networks formed via thermally reversible covalent bonds have outstanding self-healing and adaptable properties, combined with very good mech. properties and solvent resistance. This work reports for the first time the synthesis and characterization of such materials, derived from epoxidized linseed or soybean oils crosslinked with different amounts of 2,2′-dithiodibenzoic acid. The epoxy/hardener ratio was studied as a key parameter influencing the overall process and moreover the network recyclability. The synthesized thermosets showed excellent chem. recycling and mech. reprocessing abilities. The produced networks were chem. recycled, then the recuperated reprocessed material was found to show no or a small decrease in mech. properties. These biobased thermosets provide opportunities for the circular use of thermosets.

Materials Advances published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Di Mauro, Chiara published the artcileChemical and mechanical reprocessed resins and bio-composites based on five epoxidized vegetable oils thermosets reinforced with flax fibers or PLA woven, Application of 2,2′-Dithiodibenzoic acid, the publication is Composites Science and Technology (2021), 108678, database is CAplus.

Bio-epoxy resins based on five epoxidized vegetable oils were formulated with an aromatic disulfide crosslinker with diacid functionality, 2,2′-dithiodibenzoic acid (DTBA), to obtain recyclable epoxy thermosets. Flax fibers (FF) and PLA woven were used as bio-based reinforcements for these matrixes. Different percentages of reinforcement were tested and the effect of the natural fibers on the matrix’s crosslinking reaction was studied by DSC anal. Then, the obtained materials were analyzed by differential scanning calorimetry, thermogravimetric anal., dynamic mech. anal., water absorption and SEM. The reinforcements improved the thermal and mech. properties of the neat resins, with tan ¦Ä values varying from 91 to 148¡ãC showing a good compatibility matrix-FF but a reduced one in case of matrix-PLA woven. The dynamic nature of the networks crosslinking allowed the chem. and mech. recycling of both resins and bio-composites. Moreover, the obtained results show the possibility to recuperate the natural FF filler for the preparation of second-life generation bio-composites.

Composites Science and Technology published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Application of 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Di Mauro, Chiara published the artcileKinetical Study, Thermo-Mechanical Characteristics and Recyclability of Epoxidized Camelina Oil Cured with Antagonist Structure (Aliphatic/Aromatic) or Functionality (Acid/Amine) Hardeners, Product Details of C14H10O4S2, the publication is Polymers (Basel, Switzerland) (2021), 13(15), 2503, database is CAplus and MEDLINE.

In an attempt to prepare sustainable epoxy thermosets, this study introduces for the first time the idea to use antagonist structures (aromatic/aliphatic) or functionalities (acid/amine) as hardeners to produce reprocessable resins based on epoxidized camelina oil (ECMO). Two kinds of mixtures were tested: one combines aromatic/aliphatic dicarboxylic acids: 2,2-dithiodibenzoic acid (DTBA) and 3,3-dithiodipropionic acid (DTDA); another is the combination of two aromatic structures with acid/amine functionality: DTBA and 4-aminophenyl disulfide (4-AFD). DSC and FT-IR analyses were used as methods to analyze the curing reaction of ECMO with the hardeners. It was found that the thermosets obtained with the dual crosslinked mechanism needed reduced curing temperatures and reprocessing protocols compared to the individual crosslinked thermosets. Thanks to the contribution of disulfide bonds in the network topol., the obtained thermosets showed recycling ability. The final thermomech. properties of the virgin and mech. reprocessed materials were analyzed by DMA and TGA. The obtained thermosets range from elastomeric to rigid materials. As an example, the ECMO/DTBA₇₀4-AFD₃₀ virgin or reprocessed thermosets have tan ¦Ä values reaching 82-83¡ãC. The study also investigates the chem. recycling and the solvent resistance of these vitrimer-like materials.

Polymers (Basel, Switzerland) published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C14H10O4S2, Product Details of C14H10O4S2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kumar, Amit published the artcileSilicon Fluorides for Acid-Base Catalysis in Glycosidations, Application In Synthesis of 312-40-3, the publication is Advanced Synthesis & Catalysis (2012), 354(8), 1489-1499, database is CAplus.

Adduct formation between alcs. as glycosyl acceptors and phenylsilicon trifluoride (PhSiF₃) as catalyst permits acid-base-catalyzed glycosidations with O-glycosyl trichloroacetimidates as glycosyl donors. In this way, from various glycosyl donors and acceptors 1,2-trans- and some 1,2-cis-glycosides could be obtained with high anomeric selectivity. A preference for an intramol. bimol. nucleophilic substitution (S_N2-type) reaction course with concomitant donor and acceptor activation is supported by the results.

Advanced Synthesis & Catalysis published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Application In Synthesis of 312-40-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia