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New intrinsically unsymmetric aromatic donors (D) and acceptors (A) were designed to simplify the incorporation of a single reactive group. Naphthalene diimide (NDI) was desymmetrized by replacing one of the imide units with two nitro groups to yield 3,6-dinitronaphthalene monoimide (NMI(NO)); likewise, 3,6-dimethoxycarbazole (CBZ(OMe)) was designed as a 3-ring aromatic donor. Different derivatives of naphthalene monoimide (NMI) and carbazole (CBZ) were prepared, and charge-transfer complex formation between them was studied using NMR and UV-visible titrations; the estimated association constants () were compared with the common pair, NDI, and 1,5-dialkoxy naphthalene (DAN).
View Article and Find Full Text PDFRegiospecific Methylalumination of Silacyclopropenes: The Access to Z-1-Silyl-2-Aluminyl-Disubstituted Olefins.
Inorg Chem
December 2024
ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, Université de Rennes, CNRS 263 av. du général Leclerc, F-35042 Rennes, France.
A methodology to access Z-1-silyl-2-aluminyl-disubstituted olefins is developed. It relies on the uncatalyzed ring opening of silacyclopropenes in the presence of a stoichiometric amount of trimethylaluminum. The resulting heterosubstituted alkenes exhibit a particular interaction between the electron-rich [Si-CH] moiety and the electron-deficient diorganoaluminyl group, resulting in similar geometrical features due to the proximity of these two centers.
View Article and Find Full Text PDFAerobic Thiols Oxidative Coupling to Disulfides over Robust CoO Nanoclusters Confined within Hierarchical Silicalite-1 Zeolite.
Inorg Chem
November 2024
State Key Laboratory of Petroleum Molecular & Process Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China.
Disulfide is an important organic reagent and synthetic intermediate that is widely used in organic synthesis, polymers, and other fields, but its synthesis still suffers from many environmental pollution and economic problems. Here, we present an environmentally friendly and efficient base-free aerobic oxidative thiol coupling catalyzed by heterogeneous CoO nanoclusters entrapped in hierarchical silicalite-1 zeolite, synthesized by combining silane pore expansion and metal coordination methods under hydrothermal conditions. It is confirmed that open hierarchical channels favor mass diffusion, and the chemical valence of Co species in CoO/-S-1-H is +2, which is different from that of CoO particles in CoO/-S-1-I.
View Article and Find Full Text PDFDesign, Synthesis, and Cytotoxic Studies of Some Novel Arylidene-Hydrazinyl-Thiazoles as Anticancer and Apoptosis-Inducing Agents.
ACS Omega
September 2024
Department of Natural Sciences, University of Houston, Downtown, Houston, Texas 77002, United States.
Cancer, defined by uncontrolled cell growth, poses a significant global health challenge, necessitating the development of new anticancer drugs crucial to address drug resistance, side effects, and the need for combination therapies. The study presents the design, synthesis, and anticancer screening of a series of novel functionalized arylidene-hydrazinyl-thiazoles against various human cancer cell lines. The environmentally benign synthetic protocol involves the visible-light prompted, NBS-mediated domino reaction of thiosemicarbazide, heteroaryl aldehydes, and unsymmetrical 1,3-diketones.
View Article and Find Full Text PDFHydrazone-Linked Donor-Acceptor Covalent Organic Polymer as a Heterogeneous Photocatalyst for C-S Bond Formation.
Chemistry
September 2024
Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India.
In the realm of solar energy utilization, there is a growing focus on designing and implementing effective photocatalytic systems, for the conversion of solar energy into valuable chemical fuels. The potential of Covalent Organic Polymers (COPs) as photocatalysts for visible-light-driven organic transformation has been widely investigated, positioning them as promising candidates in this field. In the design of COPs, introducing a donor-acceptor arrangement facilitates the transfer of electrons from the donor to the acceptor, creating a charge transfer complex and leading to enhanced conductivity and improved charge separation.
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