Results 31 to 40 of about 42,802 (288)

Synthetic Cathinones: Recent Developments, Enantioselectivity Studies and Enantioseparation Methods

open access: yesMolecules, 2022
New psychoactive substances represent a public health threat since they are not controlled by international conventions, are easily accessible online and are sold as a legal alternative to illicit drugs. Among them, synthetic cathinones are widely abused
Ana Sofia Almeida   +4 more
doaj   +1 more source

Carbohydrate-Based Azacrown Ethers in Asymmetric Syntheses

open access: yesChemistry, 2021
Carbohydrate-based crown ethers represent a special group of chiral phase transfer catalysts. Several derivatives of these macrocycles have been synthesized in our research group.
István Orbán, Péter Bakó, Zsolt Rapi
doaj   +1 more source

Modification of chiral dimethyl tartrate through transesterification : immobilisation on POSS and enantioselectivity reversion in Sharpless asymmetric epoxidation [PDF]

open access: yes, 2010
Modification of dimethyl tartrate has been investigated through transesterification with aminoalcohols to provide reactive functionalities for the covalent bonding of chiral tartrate to polyhedral oligomeric silsesquioxanes.
García, Rafael A.   +4 more
core   +1 more source

Enantioselective Organocatalytic Hydride Reduction. [PDF]

open access: yesChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Stéphane G, Ouellet   +2 more
openaire   +2 more sources

Semi-Preparative Separation, Absolute Configuration, Stereochemical Stability and Effects on Human Neuronal Cells of MDPV Enantiomers

open access: yesMolecules, 2023
Synthetic cathinones, such as 3,4-methylenedioxypyrovalerone (MDPV), are widely abused due to their psychostimulant effects. As they are chiral molecules, studies of their stereochemical stability (racemization can occur in certain temperatures and ...
Ana Sofia Almeida   +5 more
doaj   +1 more source

Lipase catalysed kinetic resolution of racemic 1,2-diols containing a chiral quaternary center [PDF]

open access: yes, 2018
Optically active 1,2-diols are valuable buildings blocks in organic synthesis. In the present paper, a set of racemic 1,2-diols with an ester functional group are prepared, starting from -ketoesters in a three-step procedure with moderate yields.
Gonzalo Calvo, Gonzalo de
core   +2 more sources

Enhanced Production of (S)-2-arylpropionic Acids by Protein Engineering and Whole-Cell Catalysis

open access: yesFrontiers in Bioengineering and Biotechnology, 2021
Esterases are important biocatalysts for chemical synthesis. Several bHSL family esterases have been used to prepare (S)-2-arylpropionic acids with stronger anti-inflammatory effects via kinetic resolution.
Xiaolong Liu   +3 more
doaj   +1 more source

Asymmetric Hydrogenation in Water by a Rhodium Complex of Sulfonated 2,2'-Bis(diphenylphosphino)-1,1'-binaphthyl (binap) [PDF]

open access: yes, 1993
The synthesis of sulfonated 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (binap) is reported; a rhodium complex of this ligand is the first to perform asymmetric hydrogenation in neat water with optical yields as high as those obtained in nonaqueous ...
Davis, Mark E., Wan, Kam-to
core   +1 more source

Enantioselective Organocatalytic Reductive Amination [PDF]

open access: yesJournal of the American Chemical Society, 2005
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Storer, R. Ian   +3 more
openaire   +3 more sources

Merging Biocatalysis and Chemocatalysis in Flow: State‐of‐the‐Art and Future Directions for Sustainable Synthesis

open access: yesAngewandte Chemie, EarlyView.
This review highlights recent advances in integrating biocatalysis and chemocatalysis in continuous flow to create streamlined, sustainable processes. It examines chemo‐enzymatic cascades combining at least one enzymatic and one chemical step, discusses challenges such as enzyme immobilization, leaching, and reactor clogging, and presents solutions ...
Petros Siasiaridis   +2 more
wiley   +2 more sources

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