Results 81 to 90 of about 10,179 (225)

Pyrimidine-Derived Prolinamides as Recoverable Bifunctional Organocatalysts for Enantioselective Inter- and Intramolecular Aldol Reactions under Solvent-Free Conditions [PDF]

, 2015
Chiral L-prolinamides 2 containing the (R,R)- and (S,S)-trans-cyclohexane-1,2-diamine scaffold and a 2-pyrimidinyl unit are synthesized and used as general organocatalysts for intermolecular and intramolecular aldol reactions with 1,6-hexanedioic acid as
Fiser, Béla, Gómez Bengoa, Enrique, Nájera, Carmen, Sansano, Jose M., Vizcaíno-Milla, Pascuala   +4 more
core   +2 more sources

How Amino Acids Intercalate in CaFe Layered Double Hydroxides: A Combined RIXS and NEXAFS Study

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
Intercalation of amino acids in layered double hydroxides offers a road to functional (bio)catalysts. With resonant soft x‐ray spectroscopy we probe the electronic structure of these systems and observe activation and passivation of electronic states as well as bond formation between the amino acid and the LDH upon intercalation.
R. Büchner, A. Born, K. Ruotsalainen, R. Decker, A. Pietzsch   +4 more
wiley   +1 more source

Physicochemical Characterization and Asymmetric Catalytic Properties of New Biobased Organocatalytic Surfactants

Molecules
In organic synthesis, the solvent is the chemical compound that represents the largest proportion of the process. However, conventional solvents are often toxic and dangerous for the environment, and an interesting alternative is to replace them by water.
Elliot Calbrix, Pascale de Caro, Sophie Thiebaud-Roux, Christine Cecutti, Emeline Vedrenne   +4 more
doaj   +1 more source

Learning Strategies from Nature's Blueprint to Cyclic Carbonate Synthesis

ChemSusChem, Volume 18, Issue 6, March 15, 2025.
The development of sustainable synthetic methods for cyclic carbonates draws inspiration from nature, focusing on eco‐friendly processes and renewable resources like CO2 and biomass. This review explore various CO2 activation mechanisms, green chemistry principles, and green catalysts.
Erika Saccullo, Vincenzo Patamia, Chiara Zagni, Antonio Rescifina, Giuseppe Floresta   +4 more
wiley   +1 more source

Reaction Mechanism of Organocatalytic Michael Addition of Nitromethane to Cinnamaldehyde: A Case Study on Catalyst Regeneration and Solvent Effects [PDF]

, 2017
The Michael addition of nitromethane to cinnamaldehyde has been computationally studied in the absence of a catalyst and the presence of a biotinylated secondary amine by a combined computational and experimental approach. The calculations were performed
Luk, Louis Y. P., Moliner, Vicent, Nödling, Alexander, Tsai, Yu-Hsuan, Świderek, Katarzyna   +4 more
core   +4 more sources

Monosaccharide‐Based Macrocyclic Receptors—History and Recent Applications

Helvetica Chimica Acta, EarlyView.
This perspective provides an overview of most common applications of monosaccharide‐based macrocycles in molecular recognition over the past four decades. The most recent achievements, such as fluorescent ion sensing and selective amino acid binding in aqueous media, including the work from the author's lab, are highlighted. Potential future directions
Bartosz Lewandowski
wiley   +1 more source

Oxidant-Resistant Hydrogen-Bond-Donating Organocatalyst for Enantioselective Nucleophilic Epoxidation of α,β-Unsaturated Amides [PDF]

, 2014
Bifunctional benzothiadiazine-catalyzed epoxidation of α, β-unsaturated amides proceeds efficiently to give chiral 2-oxiranecarboxamides in excellent yields of 89–99 % and with good enantioselectivity of up to 84 % ee.
Kobayashi, Yusuke, Li, Shanji, Takemoto, Yoshiji   +2 more
core   +1 more source

Enzymatic Ring‐Opening Polymerization of ε‐Caprolactone in Novel Green Solvents: from Batch Systems to Continuous Flow Mesoreactors

Macromolecular Materials and Engineering, EarlyView.
Multi‐gram synthesis of CaLB‐catalyzed ROP of ε‐CL in green organic media under flow conditions. ABSTRACT The transition toward sustainable alternatives in polymeric material production is a critical step in reducing the environmental impact of the traditional plastic industry.
Tullio Crovetto, Andrea Pasquale, Daniele Alessandro Consolini, Martina Letizia Contente, Alessandro Pellis   +4 more
wiley   +1 more source

Recent applications of chiral calixarenes in asymmetric catalysis

Beilstein Journal of Organic Chemistry, 2018
The use of calixarenes in asymmetric catalysis is receiving increasing attention due to their tunable three-dimensional molecular platforms along with their easy syntheses and versatile modification at the upper and lower rims. This review summarizes the
Mustafa Durmaz, Erkan Halay, Selahattin Bozkurt   +2 more
doaj   +1 more source

Development of Guanidine-Bisurea Bifunctional Organocatalysts with a Chiral Pyrrolidine Moiety and Application to α-Hydroxylation of Tetralone-Derived β-Keto Esters

Molecules, 2015
Novel guanidine-bisurea bifunctional organocatalysts 5 bearing a chiral pyrrolidine moiety on guanidine were designed with the guidance of DFT calculations.
Minami Odagi, Kan Takayama, Makoto Sato, Masahiro Yamanaka, Kazuo Nagasawa   +4 more
doaj   +1 more source