Results 31 to 40 of about 19,944 (197)

Pyrethroid Stereoisomerism: Diastereomeric and Enantiomeric Selectivity in Environmental Matrices – A Review

Orbital: The Electronic Journal of Chemistry, 2018
Pyrethroids are chiral insecticides characterized by stereoisomerism, which occurs due to the presence of one to three asymmetric (chiral) carbons, generating one or two pairs of cis/trans diastereomers, and two or four pairs of enantiomers ...
Cláudio Ernesto Taveira Parente, Claudio Eduardo Azevedo-Silva, Rodrigo Ornellas Meire, Olaf Malm   +3 more
doaj   +3 more sources

Bromidocarbonyl{(1S,2S)-N-[2-(dicyclohexylphosphanyl)ethylidenyl]-N′-[2-(diphenylphosphanyl)ethyl]-1,2-diphenylethane-1,2-diamine}iron(II) tetraphenylborate

IUCrData, 2017
In the title compound, trans-(S,S)-[FeBr(CO)(PPh2CH2CH2NHCHPhCHPhNCHCH2PCy2)]BPh4, the FeII ion is in a distorted octahedral complex geometry with a cis-β ligand geometry in which two diastereomers co-crystallized in the asymmetric unit.
Samantha A. M. Smith, Alan J. Lough, Robert H. Morris   +2 more
doaj   +1 more source

Synthesis and stereochemistry of 6-membered ring phosphonates [PDF]

QScience Connect, 2012
Background: Organophosphorus compounds have important industrial and biomedical applications as pharmaceutical and agrochemical agents, as well as transition state analogs for the production of monoclonal antibodies.
Michael D. Pungente, Larry Weiler
doaj   +1 more source

Application of 2D EXSY and qNMR Spectroscopy for Diastereomeric Excess Determination Following Chiral Resolution of β‐Lactams

ChemistryOpen, 2023
Trans‐β‐lactam isomers have garnered much attention as anti‐cancer microtubule targeting agents. Currently available synthetic methods are available for the preparation of enantiopure β‐lactams and favour isomeric cis/trans β‐lactam mixtures.
Eavan C. McLoughlin, Dr. John E. O'Brien, Dr. Cristina Trujillo, Prof. Mary J. Meegan, Prof. Niamh M. O'Boyle   +4 more
doaj   +1 more source

Organocatalytic Enantioselective Synthesis of Both Diastereomers of α-Hydroxyphosphinates

, 2016
Racemic α-acylphosphinates and formylphosphinate hydrate were used directly as the substrates in a proline derivative-catalyzed cross aldol reaction with ketones. Because of the preexisting phosphorus stereogenic center, a mixture of two diastereomers of
Sandun Perera (1891984), Cong-Gui Zhao (2081026), Sampak Samanta (2317552)   +2 more
core   +2 more sources

Analysis of cis-isomer-enriched dihydroquercetin sample by 1D and 2D NMR spectroscopy

Разработка и регистрация лекарственных средств
Introduction. The structure of dihydroquercetin (DHQ) is characterized by two chiral centers at positions 2 and 3 of the benzopyran cycle, resulting in possible diastereomers: trans- and cis-isomers.
R. P. Terekhov, A. Taldaev, E. V. Bocharov, D. I. Pankov, A. D. Savina, I. A. Selivanova   +5 more
doaj   +1 more source

The Synthesis of a Bis(thiosemicarbazone) Macrocyclic Ligand and the Mn(II), Co(II), Zn(II) and ⁶⁸Ga(III) Complexes

Molecules, 2021
A 1,4,7,10-tetraazacyclododecane (cyclen) variant bearing two thiosemicarbazone pendant groups has been prepared. The ligand forms complexes with Mn2+, Co2+ and Zn2+.
Melyssa L. Grieve, Patrick R. W. J. Davey, Craig M. Forsyth, Brett M. Paterson   +3 more
doaj   +1 more source

Pure diastereomers of a tranylcypromine-based LSD1 inhibitor: enzyme selectivity and in-cell studies

, 2015
The pure four diastereomers (11a-d) of trans-benzyl (1-((4-(2-aminocyclopropyl)phenyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate hydrochloride 11, previously described by us as LSD1 inhibitor, were obtained by enantiospecific synthesis/chiral HPLC ...
Valente S, RUOPPOLO, Giovanni, Saverio Minucci, Oronza A. Botrugno, Mercurio C, Marrocco B, Varasi M, Antonello Mai, Paola Dessanti, Ciro Mercurio, MATTEVI, ANDREA, LABELLA, DONATELLA, MARROCCO, BIAGINA, Paola Vianello, Rodriguez V, Biagina Marrocco, Mario Varasi, Vianello P, Cirilli R, Sergio Valente, Saponara B, Botrugno OA, CIOSSANI, GIUSEPPE, Giovanni Ruoppolo, Veronica Rodriguez, Labella D, Dessanti P, VALENTE, Sergio, Mai A., Donatella Labella, Giuseppe Ciossani, Ruoppolo G, MAI, Antonello, Bruna Saponara, Roberto Cirilli, Andrea Mattevi, Minucci S   +36 more
core   +1 more source

Development of novel chiral capillary electrophoresis methods for the serotonin receptor (5-HT2A) antagonist MDL 100,907 (volinanserin) and for its key intermediate compound [PDF]

, 2014
Enantioselective capillary electrophoretic methods were elaborated for the determination of the enantiomeric purity of (R)-MDL 100,907 and its preparatively resolved key intermediate compound during the synthesis route. The pKa values of the intermediate
Palkó, Roberta, Németh, Krisztina, Benéné Visy, Júlia, Kovács, Péter   +3 more
core   +1 more source

Assignment of NMR spectral data of diastereomeric tetrahydrofuranyl acetals directly from their mixture by spectral simulation [PDF]

Journal of the Serbian Chemical Society
In this study, an NMR spectral analysis of the mixture of diastereomeric acetals, synthesized from 2,3-dihydrofurane and a racemic mixture of citronellol, was performed.
Nešić Milan S., Nešić Milica D., Radulović Niko S.   +2 more
doaj   +1 more source