Results 181 to 190 of about 2,056,277 (235)

Water-Soluble Hypervalent Iodine(III) Having an I-N Bond. A Reagent for the Synthesis of Indoles.

Organic Letters, 2018
A readily accessible and bench-stable water-soluble hypervalent iodine(III) reagent ( phenyl iodonio) sulfam ate (PISA) with an I-N bond was synthesized, and its structure was characterized by X-ray crystallography.
H. Xia, Yan-Dong Zhang, Yan-hui Wang, Chi Zhang   +3 more
semanticscholar   +1 more source

Merging the Reactivity of (Pseudo)cyclic Hypervalent Iodine Reagents and Carbenes or Carbenoids

Synthesis
In this short review, we present applications merging the reactivity of cyclic hypervalent iodine reagents with carbenes and carbenoids developed in the period 2014–2024. The use of more stable cyclic hypervalent iodine reagents has led to major advances
Nieves P. Ramirez, J. Waser
semanticscholar   +1 more source

Effectively hypervalent molecules. 2. Lithium carbide (CLi5), lithium carbide (CLi6), and the related effectively hypervalent first row molecules, CLi5-nHn and CLi6-nHn

Journal of the American Chemical Society, 1983
Calculs ab initio indiquant des molecules tres stables: energies totales, energies de dissociation. Distributions de charge electronique et conformations: ces molecules ne seraient pas hypervalentes au sens strict, les electrons excedentaires etant mis en jeu dans des liaisons Li ...
Timothy Clark, Ernst Ulrich Wuerthwein, John A. Pople, Elmar Kaufmann, Paul von Ragué Schleyer   +4 more
openaire   +2 more sources

Elusive hypervalent phosphorusπ interactions: evidence for paradigm transformation from hydrogen to phosphorus bonding at low temperatures.

Physical Chemistry, Chemical Physics - PCCP, 2019
The π electron systems are the conventional electron donors to the hydrogen acceptors in hydrogen bonding. Apart from the hydrogen atom, halogens, chalcogens, pnicogens and triel/tetrel atoms can also be envisaged as electron acceptors involving π clouds.
P. Sruthi, S. Sarkar, N. Ramanathan, K. Sundararajan   +3 more
semanticscholar   +1 more source

The Chemistry of Hypervalent Molecules

Angewandte Chemie International Edition in English, 1969
AbstractMolecules formed from atoms of Groups V–VIII of the periodic table in their higher valences are studied and a general theory for their electronic and geometric structure is presented. These molecules, which we call hypervalent molecules, are unique in that a donor atom can possess two identical monovalent ligands which are bonded by different ...
openaire   +2 more sources

Unveiling the Hypervalent Electronic Structure of Main Group Zwitterions: Ylides or Ylenes? A DFT Study

Journal of Computational Chemistry
This study uses density functional theory (DFT) calculations at the M06‐2X/6–311 + G(d,p) level to explore the potential of main group non‐metals (X = O, N, S, P) to form hypervalent ylides (RmX+–YRn−2−). Substituent effects (R = alkoxy, alkyl, phenyl, H,
Mathew Saumini, C. Suresh
semanticscholar   +1 more source

Organocatalytic Group Transfer Reactions with Hypervalent Iodine Reagents

Synthesis, 2018
In recent years, a plethora of synthetic methods that employ hypervalent iodine compounds donating an atom or a group of atoms to an acceptor molecule have been developed.
M. Kalek, M. Ghosh, A. Rajkiewicz
semanticscholar   +1 more source

Experimental and theoretical investigation of new hypervalent molecules LinF (n=2–4)

Chemical Physics Letters, 2007
Abstract Hypervalent molecules of Li 3 F and Li 4 F were detected experimentally for the first time. Ionization energies determined by the thermal ionization mass spectrometry were 3.8 ± 0.2 eV for Li 2 F, 4.0 ± 0.2 eV for Li 3 F and 3.9 ± 0.2 eV for Li 4 F.
Veličković, Suzana, Koteski, Vasil J., Belošević-Čavor, Jelena, Đorđević, Vesna R., Cvetićanin, Jelena M., Đustebek, Jasmina B., Veljković, Miomir V., Nešković, Olivera M.   +7 more
openaire   +3 more sources

Iodanes as multi-tools for the total synthesis of complex natural products.

Chemical Communications, 2023
Hypervalent iodine reagents are among the most fascinating reagents described in the last 30 years since they allow a plethora of different transformations and are environmentally friendly compounds that avoid the use of toxic heavy metals in most cases.
Camille Rocq, M. Denis, S. Canesi
semanticscholar   +1 more source

Hypervalent organoselenium compounds stabilized by intramolecular coordination: synthesis and crystal structures.

Acta Crystallographica Section C Structural Chemistry, 2019
Two novel hypervalent selenium(IV) compounds stabilized by intramolecular interactions, namely 6-phenyl-6,7-dihydro-5H-2,3-dioxa-2aλ4-selenacyclopenta[hi]indene, C14H12O2Se, 14, and 5-phenyl-5,6-dihydro-4H-benzo[c][1,2]oxaselenole-7-carbaldehyde ...
K. Venkateshwaran, Rajesh Deka, S. Raju, Harkesh B. Singh, R. Butcher   +4 more
semanticscholar   +1 more source