Tag: M.W=200-250

Abassian, Maryam published the artcileA new class of organoplatinum-based DFNS for the production of cyclic carbonates from olefins and CO₂, SDS of cas: 140-28-3, the publication is RSC Advances (2020), 10(26), 15044-15051, database is CAplus and MEDLINE.

We studied the potential application of an efficient, reusable, and easily recoverable catalyst of dendritic fibrous nanosilica (DFNS)-supported platinum(II) complexes (DFNS/Pt(II) NPs) to form cyclic carbonates in the presence of epoxides by converting carbon dioxide. Cyclic carbonates from epoxides and carbon dioxide is proposed as the most appropriate way to synthesis this C1 building block. We performed FE-SEM, TEM, TGA, BET, VSM, and ICP-MS to thoroughly characterize DFNS/Pt(II) NPs.

RSC Advances published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, SDS of cas: 140-28-3.

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

Liu, Guang-yi published the artcileReverse flotation separation of diaspore and kaolinite in the presence of cationic polyacrylamide polymers, HPLC of Formula: 2016-56-0, the publication is Transactions of Nonferrous Metals Society of China (2003), 13(5), 1231-1234, database is CAplus.

Based on the crystal structure and surface properties of diaspore and kaolinite, an effective diaspore depressant, CPAM (cationic polyacrylamide) was identified based on single mineral tests, separation of synthetic mixed minerals, zeta potential, and adsorption measurements. The reverse flotation separation of diaspore and kaolinite can be carried out using dodecylamine acetate as collector and CPAM depressant at pH 5.5-8.5. The diaspore particles show large amount of active aluminum atoms that can bond with -C(O)NH₂ groups in CPAM and the -CH₂N⁺(CH₃)₃ groups in CPAM orient toward the outer surfaces of diaspore and prevent a majority of dodecylamine cations from adsorbing on diaspore, enhancing hydrophilicity of diaspore, and depressing floatability of diaspore particles. As for kaolinite, CPAM polymers have little effect on floatability.

Transactions of Nonferrous Metals Society of China published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, HPLC of Formula: 2016-56-0.

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

Chen, Shu-mei published the artcileStudy on low-grade pinnoite concentration by flotation, Name: Dodecylamineacetate, the publication is Liaoning Huagong (2010), 39(4), 356-361, database is CAplus.

Using sodium oleate and dodecylamine acetate (DAA) as compound collector, sodium metasilicate as regulator, low grade pinnoite (MgO¡¤B₂O₃¡¤3H₂O) mineral from Dachaidan areas of Qinghai province, was concentrated by reverse flotation. The results indicated that pinnoite can be separated from gypsum, basic magnesium carbonate and salt by reverse flotation. Based on experiments, suitable processing parameters were obtained as follows: collectors dodecylamine acetate 1.5 kg/t, sodium oleate 0.15kg/t, regulator sodium metasilicate 0.92kg/t, liquid-to-solid ratio 6:1, flotation temperature 30-35¡ãC and time 10 min, hydrogen ion concentration of ore pulp 9.0-9.2. Under above conditions, the mass fraction of B₂O₃ in concentrate increased from 7.82% to 12.3% by first flotation, and recovery of boron was over 60%.

Liaoning Huagong published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Name: Dodecylamineacetate.

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

Wang, Xiaobin published the artcileSynthesis and antibacterial activity of oxime ester derivatives containing 1,2,4-triazole or 1,3,4-oxadiazole moiety, Formula: C9H7F3O3, the publication is Chemical Papers (2017), 71(10), 1953-1960, database is CAplus.

A series of 1,3,4-oxadiazolyl oxime ester derivatives I [R¹ = Me, Et; R² = 3,4-dimethoxyphenyl, (4-methoxyphenoxy)methyl, [4-(trifluoromethyl)phenoxy]methyl, etc.] and 1,2,4-triazolyl oxime esters II [R¹ = Me, Et; R² = H, F, MeO, etc.] were designed and synthesized and their antibacterial activities in-vitro against Xanthomonas axonopodis pv. citri (Xac) and Xanthomonas oryzae pv. oryzae (Xoo) were evaluated. The bioassays showed that all the title compounds I and II exhibited potent antibacterial activity against Xac and Xoo. In particular, compound I [R¹ = Me, R² = 3,4-dimethoxyphenyl] and compounds II [R¹ = Me, R² = H, F, CF₃; R¹ = Et, R² = H, F, CF₃] exhibited remarkable antibacterial activity against Xoo, with the EC₅₀ values ranging from 15.15 to 49.34 ¦Ìg/mL, which were superior to that of bismerthiazol (92.61 ¦Ìg/mL). This study indicated that oxime ester derivatives containing 1,2,4-triazole I or 1,3,4-oxadiazole II moiety were used as potential alternative templates in the search for novel antibacterial agents.

Chemical Papers published new progress about 163839-73-4. 163839-73-4 belongs to catalysis-chemistry, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Ether, name is 2-(4-(Trifluoromethyl)phenoxy)acetic acid, and the molecular formula is C4H11NO, Formula: C9H7F3O3.

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

Nicolaou, K. C. published the artcileRapid access to complex molecular architectures via o-azaquinones, Category: catalysis-chemistry, the publication is Angewandte Chemie, International Edition (2001), 40(11), 2145-2149, database is CAplus and MEDLINE.

Complex analogs I and II of pseudopterosin and elisabethin natural products, resp., were prepared in a single step from the amidoaryldiene 4-[Me₂CHC(:O)NH]C₆H₄(CH₂)₃CH:CHCH:CH₂ (III) in a single step by oxidation with the Dess-Martin periodinane, allowing rapid access to natural product analogs from simple starting materials. E.g., III was prepared in 5 steps and 72% overall yield from 4-(4-aminophenyl)butanoic acid by LAH reduction of the acid to a primary alc., acylation of both the aniline and alc. moieties with isobutyryl chloride followed by hydrolysis of the ester with sodium hydroxide in methanol, oxidation of the primary alc. with o-iodooxybenzoic acid, and Horner-Wittig olefination of the aldehyde with di-Ph allyl phosphine oxide. E.g., treatment of III with 4 equivalent of the Dess-Martin periodinane and 2 equivalent of water presumably generated the key ortho-azaquinone moiety in situ; oxidation of the o-azaquinone followed by intramol. Diels-Alder cycloaddition gave benz[d]indene dione (and elisabethin analog) II in 25% yield, while intramol. Diels-Alder cycloaddition followed addition of water to the remaining imine moiety gave hexahydrophenalenone derivative (and pseudopterosin analog) I in 28% yield. I could be functionalized with various reagents to give various polycyclic natural product-like derivatives Condensation of I with aryl amines in the presence of pyridinium tosylate yielded aromatized derivatives IV [R = 2-HO-5-MeC₆H₃, 5-indazolyl, 2-(EtO₂C)C₆H₄, Ph] in 45-84% yields, while treatment of I with the hydrochlorides of amino acid esters R¹CH(NH₂)CO₂Me [R¹ = 4-HOC₆H₄, PhCH₂, Me₂CH, EtO₂CCH₂CH₂, Me, MeSCH₂CH₂, CbzNH(CH₂)₄] in the presence of pyridinium tosylate gave the fused oxazinones V in 49-80% yields, and condensation of I with diamines gave pyrazine derivatives such as VI in 73-94% yields. Condensation of I with nonracemic 1,2-aminoalcs. in the presence of pyridinium tosylate gave spirooxazole derivatives such as VII in 66-87% yields. Oxazinone and pyrazine fused derivatives such as VI can be aromatized by heating in air in either DMF or toluene solution The solid-phase preparation of combinatorial libraries of natural product-like compounds such as I and its functionalized derivatives is being explored (no data).

Angewandte Chemie, International Edition published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Category: catalysis-chemistry.

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

Wang, Anwei published the artcileMn(III) active site in hydrotalcite efficiently catalyzes the oxidation of alkylarenes with molecular oxygen, HPLC of Formula: 457-68-1, the publication is Molecular Catalysis (2021), 111276, database is CAplus.

Developing efficient heterogeneous catalytic systems based on easily available materials and mol. oxygen for the selective oxidation of alkylarenes is highly desirable. In the present research, NiMn hydrotalcite (Ni₂Mn-LDH) was found as an efficient catalyst in the oxidation of alkylarenes using mol. oxygen as the sole oxidant without any additive. Impressive catalytic performance, excellent stability and recyclability, broad applicable scope and practical potential for the catalytic system were observed Mn³⁺ species is proposed to be the efficient active site, and Ni²⁺ played an important role in stabilizing the Mn³⁺ species in the hydrotalcite structure. The kinetic study showed that the aerobic oxidation of diphenylmethane is a first-order reaction over Ni₂Mn-LDH with the activation energy (E_a) and pre-exponential factor (A₀) being 85.7 kJ mol^-1 and 1.8 x 10⁹ min^-1, resp. The Gibbs free energy (¦¤G^¡Ù) is -10.4 kJ mol^-1 K^-1 for the oxidation based on Eyring-Polanyi equation, indicating the reaction is exergonic. The mechanism study indicated that the reaction proceeded through both radical and carbocation intermediates. The two species were then trapped by mol. oxygen and H₂O or hydroxyl species, resp., to yield the corresponding products. The present research might provide information for constructing highly efficient and stable active site for the catalytic aerobic oxidation based on available and economic material.

Molecular Catalysis published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C12H17NO2, HPLC of Formula: 457-68-1.

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

Yu, Shuo-Wen published the artcileConstruction of Novel Kojic Acid Fused Furans by Domino Reactions of a Kojic Acid Derivative with (Z)-Bromonitroalkenes, Category: catalysis-chemistry, the publication is ChemistrySelect (2018), 3(17), 4827-4830, database is CAplus.

A series of novel kojic acid fused furans I (R = Ph, 1-naphthyl, 2-thienyl, etc.) have been synthesized by domino cyclization-elimination reactions of a kojic acid derivative with (Z)-bromonitroalkenes. In the presence of a bifunctional thiourea-tertiary amine organocatalyst and sodium bicarbonate, the reactions provided the products in up to quant. yields.

ChemistrySelect published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C5H11NO2S, Category: catalysis-chemistry.

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

Zhang, Jingjing published the artcileDiazaphospholene-Catalyzed Hydrodefluorination of Polyfluoroarenes with Phenylsilane via Concerted Nucleophilic Aromatic Substitution, Category: catalysis-chemistry, the publication is Journal of Organic Chemistry (2022), 87(1), 294-300, database is CAplus and MEDLINE.

The metal-free catalytic C-F bond activation of polyfluoroarenes was achieved with diazaphospholene as the catalyst and phenylsilane as the terminal reductant. D. functional theory calculations suggested a concerted nucleophilic aromatic substitution mechanism.

Journal of Organic Chemistry published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C10H10O2, Category: catalysis-chemistry.

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

Huang, Yong-Qing published the artcileOne-pot synthesis of imidazolinium salts via the ring opening of tetrahydrofuran, SDS of cas: 140-28-3, the publication is Dalton Transactions (2017), 46(37), 12430-12433, database is CAplus and MEDLINE.

A new one-pot synthesis of C2-hydroxypropyl-substituted imidazolinium salts I (R = Me, benzyl, 4-hydroxybenzyl, etc.; n = 1, 2) via the ring opening of THF with N,N’-disubstituted diamines such as N,N’-dibenzylideneethane-1,2-diamine, N,N’-bis(4-dimethylaminobenzylidene)ethane-1,2-diamine, N,N’-bis(4-hydroxybenzylidene)ethane-1,2-diamine, etc. has been developed. Preliminary studies of the reaction mechanism suggest the CO₂-promoted oxidative ring opening of THF followed by Hg(II)-mediated oxidation of an imidazolidine intermediate. These novel C2-substituted imidazolinium salts I have shown to be active catalysts for the aza-Diels-Alder reactions.

Dalton Transactions published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, SDS of cas: 140-28-3.

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

Lyu, Zhigang published the artcileSteric-free bioorthogonal labeling of acetylation substrates based on a fluorine-thiol displacement reaction, Recommanded Product: 2,4,6-Trimethoxybenzenethiol, the publication is Journal of the American Chemical Society (2021), 143(3), 1341-1347, database is CAplus and MEDLINE.

We have developed a novel bioorthogonal reaction that can selectively displace fluorine substitutions alpha to amide bonds. This fluorine-thiol displacement reaction (FTDR) allows for fluorinated cofactors or precursors to be utilized as chem. reporters, hijacking acetyltransferase-mediated acetylation both in vitro and in live cells, which cannot be achieved with azide- or alkyne-based chem. reporters. The fluoroacetamide labels can be further converted to biotin or fluorophore tags using FTDR, enabling the general detection and imaging of acetyl substrates. This strategy may lead to a steric-free labeling platform for substrate proteins, expanding our chem. toolbox for functional annotation of post-translational modifications in a systematic manner.

Journal of the American Chemical Society published new progress about 77189-99-2. 77189-99-2 belongs to catalysis-chemistry, auxiliary class Thiophenol,Benzene,Ether, name is 2,4,6-Trimethoxybenzenethiol, and the molecular formula is C9H12O3S, Recommanded Product: 2,4,6-Trimethoxybenzenethiol.

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