Results 31 to 40 of about 33,103 (197)

Enantiomeric Tartaric Acid Production Using cis-Epoxysuccinate Hydrolase: History and Perspectives

Molecules, 2019
Tartaric acid is an important chiral chemical building block with broad industrial and scientific applications. The enantioselective synthesis of l(+)- and d(−)-tartaric acids has been successfully achieved using bacteria presenting cis ...
Jinsong Xuan, Yingang Feng
doaj   +1 more source

Characterization of the novel ene reductase Ppo-Er1 from paenibacillus polymyxa [PDF]

, 2020
Ene reductases enable the asymmetric hydrogenation of activated alkenes allowing the manufacture of valuable chiral products. The enzymes complement existing metal- and organocatalytic approaches for the stereoselective reduction of activated C=C double ...
Aregger, David, Buller, Rebecca, Peters, Christin   +2 more
core   +1 more source

Effects of Water Addition on a Catalytic Fluorination of Dienamine

Molecules, 2019
We investigate the effects of water addition on a highly stereocontrolled fluorination of dienamine generated by α-branched enals and 6′-hydroxy-9-amino-9-deoxy-epi-quinidine with N-fluorobenzenesulfonimide (NFSI) in the presence of Brø ...
Daiki Kuraoku, Tsunaki Yonamine, Genta Koja, Norio Yoshida, Satoru Arimitsu, Masahiro Higashi   +5 more
doaj   +1 more source

Chemical Composition, Enantiomeric Distribution and Anticholinesterase and Antioxidant Activity of the Essential Oil of Diplosthephium juniperinum

Plants, 2022
The aim of this study was to extract and identify the chemical compounds of Diplosthephium juniperinum essential oil (EO) from Ecuador and to assess its anticholinesterase and antioxidant properties. The EO chemical composition was determined by GC–MS. A
Melissa Salinas, James Calva, Luis Cartuche, Eduardo Valarezo, Chabaco Armijos   +4 more
doaj   +1 more source

Influence Spatial Degeneracy on Rotational Spectroscopy Three Wave Mixing and enantiomeric state separation of Chiral Molecules

, 2018
Pulse flip angles are calculated for three wave mixing, three state cycles of chiral molecules to produce optimized free induction decay amplitudes proportional to the enantiomeric excess of a sample, and to produced optimized degree of state specific ...
Lehmann, Kevin K.
core   +1 more source

Enantiomeric oxidation of organic sulfides by the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride [PDF]

, 2007
The biotransformations of a series of substituted sulfides were carried out with the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride.
Annunziata, Auret, Bolm, Cashman, Collins, Cristina Pinedo-Rivilla, Fernández, Gamma, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Holland, Isidro G. Collado, Jones, Josefina Aleu, Khatib, Komatsu, Kubec, Kyung, Madesclaire, Mata, Page, Ricci, Sang   +28 more
core   +2 more sources

Homochiral Acyl Isocyanates as Diagnostic NMR Probes for the Enantiomeric Purity of Chiral Alcohols

Sultan Qaboos University Journal for Science, 2000
The first reported acyl and sulfonylisocyanates were developed and tested in reactions with chiral alcohols to afford diastereomeric carbamates. NMR analysis of these investigates the chemical shift discrimination that would allow these activated ...
Gregory H. P. Roos, Anthony R. Donovanb
doaj   +1 more source

Chiral Polymerization in Open Systems From Chiral-Selective Reaction Rates

, 2012
We investigate the possibility that prebiotic homochirality can be achieved exclusively through chiral-selective reaction rate parameters without any other explicit mechanism for chiral bias.
A Bakasov, A Salam, Bradley J. Nelson, C Chyba, C McKay, D Fitz, DG Fraser, DK Kondepudi, DP Glavin, F Frank, FHC Crick, J Bailey, JAD Wattis, JAD Wattis, JB Corliss, JD Dunitz, JR Cronin, LD Landau, LE Orgel, M Gleiser, M Gleiser, MA Zuilen van, Marcelo Gleiser, PC Joshi, PCW Davies, PCW Davies, PGH Sandars, R Gomes, R Hazen, R Plasson, SA Benner, Sara Imari Walker, SJ Mojzsis, W Gilbert, WA Bonner, Y Saito, Y Yamagata, Z Martins   +37 more
core   +1 more source

Attrition-enhanced total resolution leads to homochiral families of amino acid derivatives [PDF]

, 2010
The total resolution of five structurally similar racemizable amino acid derivatives, three of which have racemic crystal structures, was performed simultaneously.
Boer, Karin,, Gooier, Jesse M. de,, Kaptein, Bernard,, Kellogg, Richard M.,, Leeman, Michel,, Zwaagstra, Karen,   +5 more
core   +3 more sources

Towards Chemoenzymatic Syntheses of Both Enantiomers of Phosphoemeriamine

Molecules
An enzyme-promoted addition of nitromethane to the appropriate phosphorylated imine (aza-Henry reaction) intended to be used in the synthesis of the title phosphoemeriamine, a phospha-analog of emeriamine (aminocarnitine), failed due to the ...
Piotr Kiełbasiński, Małgorzata Kwiatkowska, Piotr Łyżwa, Marian Mikołajczyk   +3 more
doaj   +1 more source