A5085636071- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Chemical Synthesis and Reactions
- Asymmetric Synthesis and Catalysis
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Polyoxometalates: Synthesis and Applications
- Organic Chemistry Cycloaddition Reactions
- Crystallography and molecular interactions
- Axial and Atropisomeric Chirality Synthesis
- Catalytic C–H Functionalization Methods
- Synthesis and Catalytic Reactions
- Nanopore and Nanochannel Transport Studies
- Advanced Data Storage Technologies
- Oxidative Organic Chemistry Reactions
- Catalytic Processes in Materials Science
- Ammonia Synthesis and Nitrogen Reduction
- Synthesis of Indole Derivatives
- Chemical Reaction Mechanisms
- Magnetism in coordination complexes
- Photosynthetic Processes and Mechanisms
- Graphene research and applications
- Advancements in Battery Materials
Rice University
2023
Daegu Gyeongbuk Institute of Science and Technology
2015-2022
Tokyo University of Agriculture and Technology
2007-2011
Soft and weak cooperation: Conformationally flexible organic compounds were found to promote the title transformation. These "soft" organocatalysts, which are able control processes through differential activation entropies (ΔΔS≠S−R) of reactive intermediates, lead high stereoselectivities without requirement fine-tuning reaction temperatures (see scheme). Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...
A set of nickel(III) peroxo complexes bearing tetraazamacrocyclic ligands, [NiIII(TBDAP)(O2)]+ (TBDAP = N,N′-di-tert-butyl-2,11-diaza[3.3](2,6)pyridinophane) and [NiIII(CHDAP)(O2)]+ (CHDAP N,N′-dicyclohexyl-2,11-diaza[3.3](2,6)pyridinophane), were prepared by reacting [NiII(TBDAP)(NO3)(H2O)]+ [NiII(CHDAP)(NO3)]+, respectively, with H2O2 in the presence triethylamine. The mononuclear fully characterized various physicochemical methods, such as UV–vis, electrospray ionization mass...
The reactivity of mononuclear metal-hydroperoxo adducts has fascinated researchers in many areas due to their diverse biological and catalytic processes. In this study, a cobalt(III)-peroxo complex bearing tetradentate macrocyclic ligand, [CoIII(Me3-TPADP)(O2)]+ (Me3-TPADP = 3,6,9-trimethyl-3,6,9-triaza-1(2,6)-pyridinacyclodecaphane), was prepared by reacting [CoII(Me3-TPADP)(CH3CN)2]2+ with H2O2 the presence triethylamine. Upon protonation, intermediate converted into...
Soft Skills: Organische Verbindungen mit flexibler Konformation („weiche“ Organokatalysatoren) vermitteln die Titelreaktion. Sie sind in der Lage, Prozesse durch unterschiedlichen Aktivierungsentropien (ΔΔS≠S−R) reaktiven Intermediate zu steuern, und ergeben hohe Stereoselektivitäten, ohne dass eine Abstimmung Reaktionstemperaturen erforderlich wäre (siehe Schema). Ar=3,5-(CF3)2C6H3.
Abstract Herein, we present details of our conformationally flexible, 1,3‐diamine‐tethered guanidine/bisthiourea organocatalysts for chemo‐, regio‐, and enantioselective 1,4‐type Friedel–Crafts reactions phenols. These show a unique stereo‐discrimination governed by the differential activation entropy (ΔΔ S ≠ ), rather than enthalpy H ). Extensive kinetic analyses using Eyring plots series revealed key structural motif in catalysts associated with large magnitude A plausible...
Abstract Stereoselective syntheses of N,N-bis(dihydrofuranyl)hydroxyamines from phenols and nitroolefins have been accomplished by means cycle-specific catalysis with guanidine/bisthiourea organocatalyst achiral base. Circumstantial evidence supports the idea that a nitroso intermediate participates in dimerization, which involves internal redox reaction/umpolung.
Asymmetric nucleophilic epoxidation of chalcone and its derivatives was studied using chiral cyclic guanidine compounds.Pentacyclic 1a, which has a characteristic closed-type cavity, catalyzed the reaction to give epoxides with 39-60% ee.The newly developed tricyclic 4 drastically accelerated reaction, induced asymmetric induction chalcones almost same level 1a.Development novel efficient catalysts for reactions is one important challenging topics in synthetic organic...
High-valent transition metal-hydroxide complexes have been proposed as essential intermediates in biological and synthetic catalytic reactions. In this work, we report the single-crystal X-ray structure spectroscopic characteristics of a mononuclear nonporphyrinic MnIV-(OH) complex, [MnIV(Me3-TPADP)(OH)(OCH2CH3)]2+ (2), using various physicochemical methods. Likewise, [MnIV(Me3-TPADP)(OH)(OCH2CF3)]2+ (3), which is thermally stable at room temperature, was also synthesized characterized...
A mononuclear cobalt(<sc>iii</sc>)–bis(<italic>tert</italic>-butylperoxo) adduct (Co<sup>III</sup>–(OO<sup>t</sup>Bu)<sub>2</sub>) bearing a tetraazamacrocyclic ligand was synthesized and characterized using various physicochemical methods, such as X-ray, UV-vis, ESI-MS, EPR, NMR analyses.
Palladium–indium (PdIn) is a well-established bimetallic composition for reductively degrading nitrate anions, one of the most ubiquitous contaminants in groundwater. However, scarcity and variable price these rare-earth platinum group critical metals may hinder their use water treatment. Nickel (Ni), nonprecious metal same element as Pd, could partially replace lower Pd usage if resulting trimetallic sufficiently catalytically active. Herein, we report synthesis reduction catalysis...
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 200 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 200 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”
Abstract In the presence of chiral bis(thiourea) catalyst (I), ortho‐selective Friedel—Crafts products are formed.
Abstract A new chiral catalyst is presented for the synthesis of N,N‐bis(dihydrofuranyl)hydroxylamines from phenols and nitro‐olefins.