Results 301 to 310 of about 441,409 (379)

Novel DMAP@Mesoporous Silica Hybrid Heterogeneous Catalysts for the Knoevenagel Condensation: Greener Synthesis through Eco‐friendly Solvents

ChemPlusChem, EarlyView.
This study presents a sustainable approach to functionalizing DMAP by introducing an aminomethyl group for stable anchoring on mesoporous silica supports, creating an effective, recyclable hybrid catalyst. Characterized by techniques like XRD, TGA, and FT‐IR, the hybrid retained stability and showed strong catalytic performance for the Knoevenagel ...
Julio C. Fernandes P. Brito, Fabio Travagin, Mauro Barbero, Cristina Esteban, Urbano Díaz, Alexandra Velty, Giovanni B. Giovenzana, Ivana Miletto, Enrica Gianotti   +8 more
wiley   +1 more source

Characterization of Forced Degradants of Tegafur, Gimeracil, and Oteracil Potassium by Liquid Chromatographic-Electrospray Ionization-Mass Spectrometry and Simultaneous Estimation of Triple Combination in Drug Substance and Finished Pharmaceutical Dosage Form. [PDF]

Arch Razi Inst
Pal AK, Raja S.
europepmc   +1 more source

Protonation of Pt(IV) Anticancer Complexes Assayed by Vibrational Ion Spectroscopy

ChemPlusChem, EarlyView.
Protonated Pt(IV) complexes with various equatorial and axial ligands were characterized by IR ion spectroscopy and DFT. Protonation typically occurs at carboxylato ligands, eventually increasing their substitution propensity. However, the carboplatin‐derived complex showed mixed protomer populations, highlighting the significance of ligand selection ...
Davide Corinti, Elisabetta Gabano, Barbara Chiavarino, Maria Elisa Crestoni, Domenico Osella, Simonetta Fornarini   +5 more
wiley   +1 more source

Kinetic Studies Reveal that the Secondary Station Impacts the Rate of Motion of Cyclobis(Paraquat‐p‐Phenylene) in Out‐of‐Equilibrium [2]Rotaxanes

ChemPlusChem, EarlyView.
Bistable [2]rotaxanes, that incorporate monopyrrolotetrathiafulvalene (MPTTF) as the primary station (green) and either hydroquinone (HQ) or xylyl (XY) as the secondary station (red) for the cyclobis(paraquat‐p‐phenylene) ring (blue), can be pushed out of equilibrium and spectroscopic studies carried out on the isolated high‐energy metastable co ...
Mathias S. Neumann, Sofie K. Jensen, Rikke Frederiksen, Sissel S. Andersen, Kasper M. Beck, Jan O. Jeppesen   +5 more
wiley   +1 more source

High‐Throughput Drug Derivatization and Bioassay by Desorption Electrospray Ionization Mass Spectrometry

ChemPlusChem, Accepted Article.
Adapting high‐throughput (HT) synthetic methods to the modification of drugs and to testing of their bioactivity should expedite drug discovery. Here, we demonstrate the applicability of HT desorption electrospray ionization mass spectrometry (DESI MS) to achieve late‐stage functionalization (LSF) and so to rapidly generate a modified opioid library ...
R Graham Cooks, Jyotirmoy Ghosh, Nicolás M. Morato, Yunfei Feng   +3 more
wiley   +1 more source

Complexes of Paraquat with Guanine Bases Detected by Electrospray Ionization-Mass Spectrometry.

, 2002
Hiroshi Moriwaki
openalex   +2 more sources

Environment‐Dependent Ultrafast Photodynamics of Aurone Derivatives for the Photoprotection of Agrochemicals

ChemPhotoChem, EarlyView.
Five derivatised aurones were synthesised via a green approach for potential application as photoprotectants for agrochemicals. Their long‐term and ultrafast photodynamics, in solution and on a wax surface, were investigated through steady state and femtosecond transient electronic absorption spectroscopy techniques, revealing significant differences ...
Michael Hymas, Jack Dalton, Benjamin Rioux, Amandine L. Flourat, Florent Allais, Reza Omidyan, Vasilios G. Stavros   +6 more
wiley   +1 more source

Unexpected Fragmentation of a Novel Cationic Glycosphingolipid, Glyceroplasmalopsychosine, by Electrospray Ionization and Low Energy Multistage Mass Spectrometry.

, 2002
Keiko Tadano‐Aritomi, Toshiyuki Hikita, Takeshi Kasama, Sen‐itiroh Hakomori, Ineo Ishizuka   +4 more
openalex   +2 more sources

Synthetic Lignin Oligomers: Analytical Techniques, Challenges, and Opportunities

ChemSusChem, EarlyView.
The review begins by discussing lignin and its structural complexity, followed by challenges in elucidating depolymerization products and the analytical techniques used. It then focuses on the chemical structure of synthetic lignin oligomers, their synthesis mechanisms, and their significance in current science. Finally, scientific gaps are identified,
Myriam Rojas, Frederico G. Fonseca, Ursel Hornung, Axel Funke, Nicolaus Dahmen   +4 more
wiley   +1 more source

Acid‐Promoted Depolymerization of Poly(hydroxyurethane)s to Five‐Membered Cyclic Carbonates toward Chemical Recycling

ChemSusChem, Accepted Article.
We report on the depolymerization of poly(hydroxyurethane)s prepared from five‐membered cyclic carbonates and amines. Based on the model reaction of hydroxyurethanes with low molecular weight, we examined the decomposition behavior and revealed that the trifluoroacetic acid promoted the transformation into a five‐membered cyclic carbonate in good yield.
Sho Morinaga, Yasuyuki Mori, Ryu Tada, Yoshio Furusho, Takehiro Kawauchi, Takeshi Endo   +5 more
wiley   +1 more source