Results 21 to 30 of about 10,179 (225)

Pursuing Chemical Efficiency by Using Supported Organocatalysts for Asymmetric Reactions under Aqueous Conditions [PDF]

, 2015
Over the past decade, a great effort has been made by the chemical community to improve the efficiency of organic transformations and allow sustainable processes.
Alonso, Diego A., Baeza, Alejandro, Chinchilla, Rafael, Flores Ferrándiz, Jesús, Guillena, Gabriela, Gómez-Martínez, Melania, Trillo Alarcón, María Paz   +6 more
core   +2 more sources

A Free N‐Heterocyclic Carbene and Its Metal Complex

Angewandte Chemie, EarlyView.
Free N‐heterocyclic carbenes (NHCs) are directly visualized on ultrathin sodium‐chloride films on gold (NaCl/Au(111)) using scanning tunneling microscopy (STM), atomic force microscopy (AFM), and density functional theory (DFT). Submolecular imaging reveals their structure and frontier orbital.
Ankita Das, Tzu‐Chao Hung, Andreas Rank, Felix Giselbrecht, Jonas Schön, Mowpriya Das, Nikos Doltsinis, Saeed Amirjalayer, Jascha Repp, Frank Glorius   +9 more
wiley   +2 more sources

Recent advances and prospects in the organocatalytic synthesis of quinazolinones

Frontiers in Chemistry, 2022
Quinazolinone, a bicyclic compound, comprises a pyrimidine ring fused at 4´ and 8´ positions with a benzene ring and constitutes a substantial class of nitrogen-containing heterocyclic compounds on account of their frequent existence in the key fragments
Biplob Borah, Sidhartha Swain, Mihir Patat, L. Raju Chowhan   +3 more
doaj   +1 more source

Site-selective C-C modification of proteins at neutral pH using organocatalyst-mediated cross aldol ligations [PDF]

, 2018
The bioconjugation of proteins with small molecules has proved an invaluable strategy for probing and perturbing biological mechanisms. The general use of chemical methods for protein functionalisation can be limited however by the requirement for ...
Agarwal, Agarwal, Ahrendt, Alam, Blackman, Brabham, Brannigan, Chalker, Chang, Cordova, Crugeiras, Denny, Dirksen, Ducry, Eickbush, Fink, Gaunt, Geoghegan, Gilmore, Haupts, Huang, Kinnell, Kitov, Krall, Kudirka, Kölmel, Lang, Lang, Lang, Latypov, List, MacDonald, Maruani, Maruani, McKean, Northrup, Northrup, Osman, Pirnot, Puthenveetil, Rosen, Sohn, Spears, Swietnicki, Tipping, Torii, Trost, van Kasteren, Wedegaertner, Wright, Yang, Zhang   +51 more
core   +3 more sources

Rapid and Stereoselective Ring‐Opening Polymerization of rac‐Lactide Enabled by a Chiral Cyclopropenimine–Thiourea Catalyst

Angewandte Chemie, EarlyView.
Chiral cyclopropenimine–thiourea organocatalysts enabled both high reactivity and precise stereocontrol in the ring‐opening polymerization of rac‐lactide. The bifunctional system exhibited a TOF up to 1,710 h−1 with Pm = 0.90 at 25°C, and achieved Pm = 0.99 at −78°C while maintaining a TOF of 16.3 h−1.
Sumin Lee, Hooseung Lee, Hyeongwoo Nam, Seungyun Jo, Minseong Kim, Dongwook Kim, Du Yeol Ryu, Sarah Yunmi Lee, Byeong‐Su Kim   +8 more
wiley   +2 more sources

Stereoselective Glycosylation of 2-Nitrogalactals Catalyzed by a Bifunctional Organocatalyst [PDF]

, 2016
The use of a bifunctional cinchona/thiourea organocatalyst for the direct and α-stereoselective glycosylation of 2-nitrogalactals is demonstrated for the first time.
Balmond, Edward, Coe, Diane M, Crisenza, Giacomo, Galan, Carmen, Harper, Matt, McGarrigle, Eoghan M., Medina Villar, Sandra, Miranda Alcazar, Silvia   +7 more
core   +2 more sources

Carbapenems as water soluble organocatalysts [PDF]

Wellcome Open Research, 2018
Background: Identification of organocatalysts functioning in aqueous environments will provide methods for more sustainable chemical transformations and allow tandem reactions with biocatalysts, like enzymes. Here we examine three water-soluble carbapenem antibiotics (meropenem, doripenem, and ertapenem) as secondary amine organocatalysts in aqueous ...
Thomas L. Williams, Alexander R. Nödling, Yu-Hsuan Tsai, Louis Y. P. Luk   +3 more
openaire   +2 more sources

Near‐Infrared‐Light‐Driven Photochemistry and Photocatalysis: Mechanisms, Recent Applications, and Opportunities in Organic Synthesis and Biology

Angewandte Chemie, EarlyView.
This minireview highlights recent advances in catalyst development and mechanistic strategies that enable photochemical and photocatalytic reactivity under 700–1000 nm NIR light, emphasizing how long‐wavelength excitation expands opportunities in both synthetic chemistry and biology.
Santosh K. Pagire, Wesley J. Olivier, Debabrata Maiti, Alex C. Bissember   +3 more
wiley   +2 more sources

Organocatalytic Enantioselective Henry Reactions [PDF]

, 2011
This is an open access article distributed under the Creative Commons Attribution License.A large number of interesting organocatalytic enantioselective protocols have been explored and successfully applied in the last decade.
Herrera, Raquel P., Marqués-López, Eugenia, Álvarez-Casao, Yolanda   +2 more
core   +2 more sources

Depolymerization and Reuse of Polycarbonates: Emerging Classes, Mechanisms and Challenges

Angewandte Chemie, EarlyView.
This review collects the latest developments in the area of chemical and catalytic polycarbonate recycling strategies and includes the controlled degradation of similar types of macromolecules. Apart from the main strategies for deconstruction, the key mechanistic features of these depolymerization processes are also discussed together with the ...
Davide Rigo, David H. Lamparelli, Antonio Buonerba, Carmine Capacchione, Arjan W. Kleij   +4 more
wiley   +2 more sources