A Condensation/Reductive Alkylation/Hydrogenation Cascade for Facile Synthesis of Chiral 2,3‐Disubstituted Indolines
Sign Up to like & getrecommendations! Published in 2019 at "Asian Journal of Organic Chemistry"
DOI: 10.1002/ajoc.201900289
Abstract: A divergent and enantioselective procedure for synthesis of 2,3-disubstituted indolines was developed through Brønsted acid/palladium-complex promoted condensation/reductive alkylation/ hydrogenation cascade reactions from simple amino ketones and aldehydes in one operation. Five Brønsted acid-promoted steps and… read more here.
Keywords: disubstituted indolines; chiral disubstituted; synthesis; nsted acid ... See more keywords
Chiral Brønsted acid catalyzed asymmetric oxidation of N-acyl sulfenamide by H2 O2 : An efficient approach to obtaining chiral N-acyl sulfinamide.
Sign Up to like & getrecommendations! Published in 2022 at "Chirality"
DOI: 10.1002/chir.23478
Abstract: Although the power of chiral sulfinamide reagents in synthetic chemistry has long been recognized, methods for their synthesis are still auxiliary-based approaches which possess the disadvantages of poor atom economy and limited substrate universality. Due… read more here.
Keywords: chiral nsted; catalyzed asymmetric; nsted acid; acid ... See more keywords
Hydrogen Bonding and Internal or External Lewis or Brønsted Acid Assisted (Thio)urea Catalysts
Sign Up to like & getrecommendations! Published in 2019 at "European Journal of Organic Chemistry"
DOI: 10.1002/ejoc.201901344
Abstract: This work was supported by a 2018 Leonardo Grant for Researchers and Cultural Creators, BBVA Foundation. The authors also thank Ministerio de Economia, Industria y Competitividad (MINECO‐FEDER CTQ2016‐75816‐C2‐1‐P and CTQ2017‐88091‐P) and Gobierno de Aragon‐Fondo Social… read more here.
Keywords: nsted acid; lewis nsted; external lewis; bonding internal ... See more keywords
Brönsted acid hydrotrope combined catalysis in water: a green approach for the synthesis of indoloquinoxalines and bis-tetronic acids
Sign Up to like & getrecommendations! Published in 2021 at "Research on Chemical Intermediates"
DOI: 10.1007/s11164-021-04430-w
Abstract: The present work describes the applications of Brönsted acid hydrotrope combined catalyst (BAHC) as a mild, efficient and reusable catalyst for synthesis of indoloquinoxalines and bis-tetronic acids in water. Using BAHC, we synthesized many indoloquinoxaline… read more here.
Keywords: nsted acid; hydrotrope combined; acid hydrotrope; bis tetronic ... See more keywords
Brønsted acid catalyzed enantioselective pericyclic reactions
Sign Up to like & getrecommendations! Published in 2017 at "Tetrahedron"
DOI: 10.1016/j.tet.2017.02.059
Abstract: Abstract Pericyclic reactions can be challenging processes to render asymmetric, due to the concerted and non-polar nature of the transition states. Several examples have been reported in which a suitable catalyst binds to a heteroatom-containing… read more here.
Keywords: nsted acid; catalyzed enantioselective; acid catalyzed; pericyclic reactions ... See more keywords
Hydrogen Bond Formation of Brønsted Acid Sites in Zeolites
Sign Up to like & getrecommendations! Published in 2020 at "Chemistry of Materials"
DOI: 10.1021/acs.chemmater.9b04714
Abstract: Bronsted acid sites (BAS) in dry aluminosilicate zeolites, also known as bridging OH–H groups, may form hydrogen bonds with other framework oxygen atoms, O, in addition to BAS that are free of such... read more here.
Keywords: nsted acid; bond formation; hydrogen bond; acid sites ... See more keywords
ZnCl2: A Green Brønsted Acid for Selectively Recovering Rare Earth Elements from Spent NdFeB Permanent Magnets.
Sign Up to like & getrecommendations! Published in 2022 at "Environmental science & technology"
DOI: 10.1021/acs.est.1c08260
Abstract: The spent neodymium-iron-boron (NdFeB) magnet is a highly valuable secondary resource of rare earth elements (REEs). Hydrometallurgical processes are widely used in recovering REEs from spent NdFeB magnets, but they will consume large amounts of… read more here.
Keywords: earth elements; ndfeb permanent; nsted acid; rare earth ... See more keywords
Silicon Carbamates by CO2 Fixation: Brønsted Acid Labile Precursor of a Lewis Superacid.
Sign Up to like & getrecommendations! Published in 2022 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.2c02754
Abstract: Treatment of Lewis superacidic Si(catCl)2(MeCN)2 and tetramethylpiperidine (TMP) or hexahydropyrimidopyrimidine (hppH) with CO2 leads to an FLP-type formation of silicon carbamates. The employed Lewis base determines the hapticity at silicon and the reactivity of the… read more here.
Keywords: silicon carbamates; co2 fixation; nsted acid; lewis ... See more keywords
Mechanistic Insight into Palladium/Brønsted Acid Catalyzed Methoxycarbonylation and Hydromethoxylation of Internal Alkene: A Computational Study.
Sign Up to like & getrecommendations! Published in 2023 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.2c04291
Abstract: Density functional theory (DFT) calculations were performed to study the palladium/Brønsted acid-catalyzed methoxycarbonylation and hydromethoxylation reactions of internal alkene. The calculated results show that the pyridyl group (N atom) in bidentate phosphine ligand with built-in… read more here.
Keywords: hydromethoxylation; palladium nsted; methoxycarbonylation; nsted acid ... See more keywords
Lewis versus Brønsted Acid Activation of a Mn(IV) Catalyst for Alkene Oxidation
Sign Up to like & getrecommendations! Published in 2019 at "Inorganic Chemistry"
DOI: 10.1021/acs.inorgchem.9b02737
Abstract: Lewis acid (LA) activation by coordination to metal oxido species has emerged as a new strategy in catalytic oxidations. Despite the many reports of enhancement of performance in oxidation catalysis, direct evidence for LA-catalyst interactions… read more here.
Keywords: lewis versus; nsted acid; oxidation; acid activation ... See more keywords
A Method for the Selective Quantification of Brønsted Acid Sites on External Surfaces and in Mesopores of Hierarchical Zeolites
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Physical Chemistry C"
DOI: 10.1021/acs.jpcc.0c09384
Abstract: Herein, we describe a method for the quantification of Bronsted acid sites located on surfaces and in pores of hierarchical zeolite catalysts. The probe triphenylphosphine (TPP) accesses only pores... read more here.
Keywords: nsted acid; selective quantification; acid sites; quantification ... See more keywords