Results 71 to 80 of about 13,053 (263)
Flipping the Card With Enantiodivergent Organocatalysis
Chemistry – A European Journal, EarlyView.This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre +3 more
wiley +1 more source
Investigation on blocking and deblocking isocyanates by sodium bisulphite [PDF]
, 2011 PurposeThe purpose of this paper is to study the effective procedure for blocking and deblocking isocyanate by sodium bisulphite with special cosolvent and dropwise method.Design/methodology/approachA number of analytical techniques, including Fourier ...
Haiyan Tan +4 more
core +1 more source
Mechanochemical Amidation Mediated by 1,1’‐Oxalyldiimidazole for the Synthesis of Agrochemicals
Chemistry – A European Journal, EarlyView.Mechanochemical amidation using 1,1'‐oxalyldiimidazole (ODI) overcomes limitations of 1,1’‐carbonyl diimidazole (CDI) as coupling agent by enabling the efficient mechanochemical synthesis of three marketed agrochemicals from deactivated carboxylic acids.
Andrea Casagrande +6 more
wiley +1 more source
Precision Chemistry for Protein Lysine Modification
Chemistry – A European Journal, EarlyView.Selective modification of lysine residues is challenging due to their similar intrinsic reactivity. Inspired by enzymatic recognition, ligand‐guided electrophiles enable site‐selective labeling and functionalization, while ligand‐guided catalyses achieve regioselective installation of bio‐relevant post‐translational modifications.
Mayu Onoda, Motomu Kanai
wiley +1 more source
Toward Circular Recycling of Polyurethanes: Depolymerization and Recovery of Isocyanates [PDF]
We report a depolymerization strategy to nearly quantitatively regenerate isocyanates from thermoplastic and thermoset polyurethanes (PUs) and then resynthesize PUs using the recovered isocyanates.
Mridula Nandi (4474687) +5 more
core +3 more sources
New methodology for specific inhalation challenges with occupational agents
Respiratory Research, 2010 Background Inhalation challenges are used for diagnosing occupational asthma (OA). The initial methodology consisted of a "realistic" exposure without monitoring nor controlling exposure.
Malo Jean-Luc +3 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Covalent linkage of a highly crystalline PHBV with a ductile P3HB4HB is shown to produce block copolymers with markedly enhanced extensibility and toughness, outperforming equivalent blends. The results demonstrate that polymer architecture, not composition alone, governs mechanical response, offering a route to biodegradable materials that combine ...
Katrin Blandine Kockler +3 more
wiley +1 more source
New Reactivity of Masked Isocyanates with Organometallic Reagents [PDF]
The research presented in this thesis centers around the stoichiometric addition of organometallic reagents, particularly Grignard reagents, to heteroatom-substituted isocyanates to provide access to hydroxamates and hydrazides via C-C bond forming ...
Mohamed, Alshimaa Mohamed Ahmed
core +1 more source
CHIMIA, 1992 Adducts obtained by 1,3-dipolar cycloadditions to 2,3-dihydroisothiazol-3-one 1,1-dioxides are inclined to undergo a cheletropic process, by which the newly formed heterocyclic part undergoes aromatization, while SO2 is extruded and an ...
Kaspar F. Burri
doaj +2 more sources
Chemistry – A European Journal, EarlyView.Proton‑transfer catalysis controls acylsemicarbazide dissociation, linking proton affinity to exchange kinetics and enabling predictive design of robust, tunable dynamic covalent networks. ABSTRACT We provide design principles for predicting bond exchange kinetics in acylsemicarbazide (ASC)‐based systems that can be applied to tuning the properties of ...
Siebe Lekanne Deprez +6 more
wiley +1 more source