Results 21 to 30 of about 48,499 (273)
Intramolecular pi-pi stacking interactions in 2-substituted N,N-dibenzylaziridinium ions and their regioselectivity in nucleophilic ring-opening reactions [PDF]
, 2009 The ring opening of 2-substituted N,N-dibenzylaziridinium ions by bromide is known to occur exclusively at the Substituted aziridine carbon atom via ail S(N)2 mechanism, whereas the opposite regioselectivity has been observed as the main pathway for ring
Catak, Saron +4 more
core +2 more sources
Journal of the Turkish Chemical Society, Section A: Chemistry, 2017 The allylation yield and regioselectivity of phenyl Grignard reagent in THF was investigated in the presence of complexed transition metals and also uncomplexed or complexed transition metal salts.
Melike Kalkan
doaj +1 more source
Jumping in the Chiral Pool: Asymmetric Hydroaminations with Early Metals
Molecules, 2023 The application of early-metal-based catalysts featuring natural chiral pool motifs, such as amino acids, terpenes and alkaloids, in hydroamination reactions is discussed and compared to those beyond the chiral pool.
Sebastian Notz +2 more
doaj +1 more source
Catalysts on Demand: Selective Oxidations by Laboratory-Evolved Cytochrome P450 BM3 [PDF]
, 2009 Efficient catalysts for selective oxidation of C-H bonds using atmospheric oxygen are highly desirable to decrease the economic and environmental costs associated with conventional oxidation processes.
Arnold, Frances H., Lewis, Jared C.
core +2 more sources
Frontiers in Plant Science, 2019 The triterpenes are structurally diverse group of specialized metabolites with important roles in plant defense and human health. Glycyrrhizin, with a carboxyl group at C-30 of its aglycone moiety, is a valuable triterpene glycoside, the production of ...
Much Zaenal Fanani +17 more
doaj +1 more source
Asymmetric addition of chiral boron-ate complexes to cyclic iminium ions [PDF]
, 2014 Boron-ate complexes derived from enantioenriched secondary benzylic boronic esters and aryl lithiums have been reacted with quinolinium, pyridinium and dihydroisoquinolinium salts to give enantioenriched heterocyclic structures with very high ...
Aggarwal, Varinder K. +4 more
core +2 more sources
Frontiers in Bioengineering and BiotechnologyThe occupancy of the binding pocket by the substrate ultimately determines the outcome of enzyme catalysis. Previous engineering and substrate scope of phenylalanine aminomutase from Taxus chinensis (TcPAM) has generated valuable knowledge about the ...
Tao Tang +3 more
doaj +1 more source
regioselectivity (regioselective) [PDF]
, 2014 Citation: 'regioselectivity (regioselective)' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.R05243 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms ...
openaire +1 more source
Extended Fused Carbazole‐BODIPY, High Brightness NIR Organic Dyes
Angewandte Chemie, EarlyView.Highly fused boron‐dipyrromethene (BODIPY) with a strong donor group has been synthesized, and their photophysical behaviors fully characterized. They exhibit outstanding brightness for fluorophores emitting in the NIR region. Water‐soluble nanoparticles filled with one of these dyes demonstrate high efficiency as the NIR II visualization agent ...
Fabien Ceugniet +9 more
wiley +2 more sources
Triazole-Directed Pd-Catalyzed C(sp2)–H Oxygenation of Arenes and Alkenes [PDF]
, 2016 Selective Pd-catalyzed C(sp2)–H oxygenation of 4-substituted 1,2,3-triazoles is described. Unlike previous metal-catalyzed C–H functionalization events, which preferentially occur at the activated heterocyclic C–H bond, the regioselective oxygenation of ...
Aizpurua Iparraguirre, Jesús María +2 more
core +2 more sources