Results 121 to 130 of about 32,089 (279)

Enantioselectivity in Vanadium-Dependent Haloperoxidases of Different Marine Sources for Sulfide Oxidation to Sulfoxides

Marine Drugs
This study explores the reasons behind the variations in the enantioselectivity of the sulfoxidation of methyl phenyl sulfide by marine-derived vanadium-dependent haloperoxidases (VHPOs). Twelve new VHPOs of marine organisms were overexpressed, purified,
Yun-Han Zhang, Ya-Ting Zou, Yong-Yi Zeng, Lan Liu, Bi-Shuang Chen   +4 more
doaj   +1 more source

Catalytic Enantioselective Syntheses of Sulfinamidines From Sulfenamides

ChemistryEurope
Sulfinamidines are sulfur(IV) functional groups with significant medicinal potential and serve as versatile intermediates toward sulfur(VI) motifs, which are also of heightened pharmaceutical interest.
Fumito Saito
doaj   +1 more source

Development of Biocatalysts Based on Lipase B From Candida antarctica Immobilized on Magnetic Poly(Styrene‐Co‐Divinylbenzene) for Application in Esterification Reactions

Journal of Applied Polymer Science, EarlyView.
Magnetic biocatalysts can be recovered from high‐viscosity reaction media, such as those used in esterification, via magnetic attraction, thereby streamlining the bioprocess and reducing costs. This work builds on prior studies by providing additional data on how particle morphology influences immobilization parameters and by further exploring ...
Sabrina S. Teixeira, Luís A. C. Romero‐Silva, Ezaine C. C. Torquato, Manoel R. da Silva, Marcos A. S. Costa, Evelin A. Manoel, Eliane P. Cipolatti, Luciana C. Costa   +7 more
wiley   +1 more source

Synthesis and Structures of Novel Chiral Cyclic Hypervalent Iodine(III) Reagents for Metal‐Free Ligand‐Transfer Reactions

Chemistry – A European Journal, EarlyView.
Several new chiral cyclic hypervalent iodine(III) reagents have been synthesized and characterized. Carbon‐based ligands were successfully installed onto the hypervalent iodine centers, giving thus access to novel chiral cyano‐, trifluoromethyl‐ or alkynyl‐bearing λ3‐iodanes.
Emmanuel Valzer, Jean‐Marc Sotiropoulos, Karinne Miqueu, Laurent Pouységu, Stéphane Quideau   +4 more
wiley   +1 more source

Enantioselective cycloaddition reactions

ChemInform, 1991
Publisher Summary This chapter reviews the cycloadditions reactions because they are popular, widely used, and also constitutes enormous body of chemistry. The chapter focuses on the landmark achievements as well as state-of-the-art examples of relevant chemistry.
openaire   +2 more sources

Crown Ethers as Regulators of Enzymatic Reactions:  Enhanced Reaction Rate and Enantioselectivity in Lipase-Catalyzed Hydrolysis of 2-Cyano-1-methylethyl Acetate

, 2016
Both reaction rate and enantioselectivity in lipase-catalyzed hydrolysis of 2-cyano-1-methylethyl acetate were significantly changed by addition of some crown ethers.
Yuji Hiyama (3036207), Yumiko Takagi (3036210), Takako Murakami (3036213), Toshiyuki Itoh (495444), Hiroshi Tsukube (1431313)   +4 more
core   +1 more source

Chiral‐at‐Metal Racemization of Tris‐Chelated Octahedral Complexes: A DFT Case Study of Al(acnac)3

Chemistry – A European Journal, EarlyView.
Racemization and isomerization of M(a‐chel)3 complexes was unraveled using Al(acnac)3 as a model. The ∆/Λ‐fac isomers have four racemization paths of which one includes isomerization to and racemization of the mer isomer. N‐substitution should enable separation of the ∆‐fac and Λ‐fac enantiomers.
George Dhimba, Alfred Muller, Koop Lammertsma   +2 more
wiley   +1 more source

Synthesis of Chiral‐at‐Sulfur(VI) Sulfonimidamide Brønsted Acids

Chemistry – A European Journal, EarlyView.
A simple, modular route to chiral‐at‐sulfur(VI) Brønsted acids is described, delivering S‐chiral sulfonimidamides, C2‐symmetric acids, and BINOL‐based hybrid systems through stereospecific reactions of sulfonimidoyl fluorides and chlorides. ABSTRACT Herein, we report an efficient and simple strategy to access diverse chiral‐at‐sulfur(VI) Brønsted acids.
Yu Han, Natassa Lional, Dieuwertje E. Streefkerk, Jesse M. S. Goed, Bo Chen, Han Zuilhof, Fedor M. Miloserdov   +6 more
wiley   +1 more source

Carboxylate–Probase Catalyzed Favorskii Reaction

Chemistry – A European Journal, EarlyView.
Stronger together: A combination of a carboxylate catalyst and a silylating agent generates a stronger base catalyst for a metal‐free catalytic addition of alkynes to aldehydes and ketones under chemoselective, O‐silylative conditions. The reaction is proposed to proceed via quaternary ammonium (Q+) cation – acetylide anion ion pairs, with chiral ...
Anton Bannykh, Sanna M. Stenfors, Anton Nechaev, John M. Fiskari, Petri M. Pihko   +4 more
wiley   +1 more source

Improving the Long‐term Enantioselectivity of a Silicon‐Carbon Bond‐Forming Enzyme [PDF]

Enantioselectivity is a key advantage of enzymatic catalysis. Understanding the most important factors influencing enantioselectivity necessitates thorough investigation for each specific enzyme.
Niemeyer, Christof M., Weber, Annika J., Rabe, Kersten S., Muhle-Goll, Claudia, Laß, Franziska J., Martini, Maria Alessandra, Moser, Celine, Bleher, Katharina   +7 more
core   +1 more source