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Design of Remote-Controllable Diels-Alder Platform on Magnetic Nanoparticles via Layer-by-Layer Assembly for AC Magnetic Field-Triggered Drug Release.
Langmuir
November 2024
Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Diels-Alder chemistry was exploited to develop a remote-controllable drug release platform on magnetic nanoparticles (MNPs). For this purpose, MNPs were decorated with anionic poly(styrenesulfonic acid--furfuryl methacrylate) (poly(SS--FMA)) and cationic poly(allylamine hydrochloride) by layer-by-layer assembly. The decorated MNPs successfully underwent DA reaction to produce covalent bonding between FMA (diene) and maleimide (dienophile)-terminated model drug.
View Article and Find Full Text PDFNickel-Catalyzed C-C Activation of Vinylcyclobutane with Visible Light: Scope, Mechanism, and Application to Chemically Recyclable Polyolefins.
J Am Chem Soc
September 2024
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.
N-heterocyclic carbene (NHC)-supported nickel complexes were investigated for the oxidative ring-opening of vinylcyclobutane (VCB) and photocatalytic activity. Addition of VCB to in situ generated [(NHC)Ni(0)] compounds furnished (NHC)Ni(VCB) that underwent oxidative addition and conversion to the corresponding Ni(II) alkyl, allyl-metallacycles. The (NHC)Ni(CH) metallacycles were isolated, characterized, and exhibited high thermal and chemical stability.
View Article and Find Full Text PDFAerosol-Assisted Chemical Vapor Deposition of 2H-WS From Single-Source Tungsten Dithiolene Precursors.
J Mater Chem C Mater
March 2024
Department of Chemistry, University of Florida, Gainesville, Florida 32611 USA.
The tungsten carbonyl dimethyldithiolene (dmdt) complexes W(CO)(dmdt), W(CO)(dmdt), and W(dmdt) were evaluated as potential single-source precursors for the chemical vapor deposition of WS. The results of TGA-MS, DIP-MS, and pyrolysis with NMR analysis were consistent with a thermal decomposition pathway in which loss of 2-butyne through a retro[3+2]cycloaddition of the dithiolene ligand generated terminal sulfido ligands. Aerosol-assisted chemical vapor deposition onto silicon substrates was performed using all three complexes, yielding 2H-WS thin films as characterized by Raman spectroscopy and GI-XRD.
View Article and Find Full Text PDFApplication of phosphorus-bridged rigid, bent bis(NHCs) as dipodal ligands in main group and transition metal chemistry.
Dalton Trans
March 2024
Institute of Inorganic Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, 53121 Bonn, Germany.
Phosphorus-bridged rigid, bent bis(N-heterocyclic) carbenes have not been reported, so far, despite having structural features that could make them interesting ligands in coordination and main group element chemistry. In previous reports, we had demonstrated that tuning of σ- and σ-phosphorus environments in planarised bis(NHCs) affects electronic properties and can provide additional coordination sites. Herein, we report on first examples of synthesis and conversion of 1,4-diphosphabarrelene-related compounds into rigid bent, doubly P-bridged bis(NHCs).
View Article and Find Full Text PDFComputational Exploration of the Thermal Rearrangement of Basketene: One Forbidden versus Two Allowed Pericyclic Reactions.
J Org Chem
October 2023
Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.
The thermal rearrangement of basketene to Nenitzescu's hydrocarbon has been explored using density functional theory (M06-2X and ωB97X-D) and DLPNO-CCSD(T) quantum mechanics. Both the sequential thermally allowed retro Diels-Alder followed by Cope rearrangement and the thermally forbidden retro-[2 + 2] cycloaddition were studied. The controlling role of orbital symmetry rather than reaction thermodynamics is demonstrated.
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