Results 21 to 30 of about 98,318 (254)

The Molecular Mechanism of the Formation of Four-Membered Cyclic Nitronates and Their Retro (3 + 2) Cycloaddition: A DFT Mechanistic Study

open access: yesMolecules, 2021
In the present work, the formation of the four-membered cyclic nitronates and the retro (3 + 2) cycloaddition (retro-32CA) reaction of the 4H-[1,2]oxazete 2-oxide were studied using the density functional theory method at the MPWB1K/6-311G(d,p ...
Agnieszka Kącka-Zych
doaj   +1 more source

Computation of Molecular Electron Affinities Using an Ensemble Density Functional Theory Method [PDF]

open access: yesThe Journal of Physical Chemistry A, 2020
The computation of electron attachment energies (electron affinities) was implemented in connection with an ensemble density functional theory method, the state-interaction state-averaged spin-restricted ensemble-referenced Kohn-Sham (SI-SA-REKS or SSR) method.
Michael Filatov   +3 more
openaire   +3 more sources

Unveiling the Chemistry of Higher-Order Cycloaddition Reactions within the Molecular Electron Density Theory

open access: yesChemistry, 2022
The higher-order cycloaddition (HOCA) reaction of tropone with cyclopentadiene (Cp) has been studied within the Molecular Electron Density Theory.
Luis R. Domingo   +2 more
doaj   +1 more source

Correlation-driven phenomena in periodic molecular systems from variational two-electron reduced density matrix theory [PDF]

open access: yesThe Journal of Chemical Physics, 2021
Correlation-driven phenomena in molecular periodic systems are challenging to predict computationally not only because such systems are periodically infinite but also because they are typically strongly correlated. Here, we generalize the variational two-electron reduced density matrix (2-RDM) theory to compute the energies and properties of strongly ...
Simon Ewing, David A. Mazziotti
openaire   +3 more sources

Experimental and Theoretical Mechanistic Study on the Thermal Decomposition of 3,3-diphenyl-4-(trichloromethyl)-5-nitropyrazoline

open access: yesMolecules, 2021
The present paper is a continuation of comprehensive study regarding to synthesis and properties of pyrazoles and their derivatives. In its framework an experimental and theoretical studies of thermal decomposition of the 3,3-diphenyl-4-(trichloromethyl)-
Karolina Kula   +5 more
doaj   +1 more source

Synthesis and Characterization of New Spirooxindoles Including Triazole and Benzimidazole Pharmacophores via [3+2] Cycloaddition Reaction: An MEDT Study of the Mechanism and Selectivity

open access: yesMolecules, 2023
A new series of spirooxindoles based on benzimidazole, triazole, and isatin moieties were synthesized via a [3+2] cycloaddition reaction protocol in one step. The single X-ray crystal structure of the intermediate triazole-benzimidazole 4 was solved. The
Saeed Alshahrani   +7 more
doaj   +1 more source

Unveiling the Unexpected Reactivity of Electrophilic Diazoalkanes in [3+2] Cycloaddition Reactions within Molecular Electron Density Theory

open access: yesChemistry, 2021
The [3+2] cycloaddition (32CA) reactions of strongly nucleophilic norbornadiene (NBD), with simplest diazoalkane (DAA) and three DAAs of increased electrophilicity, have been studied within the Molecular Electron Density Theory (MEDT) at the MPWB1K/6 ...
Luis R. Domingo   +2 more
doaj   +1 more source

Understanding the Regioselectivity and the Molecular Mechanism of [3 + 2] Cycloaddition Reactions between Nitrous Oxide and Conjugated Nitroalkenes: A DFT Computational Study

open access: yesMolecules, 2022
Regiochemical aspects and the molecular mechanism of the [3 + 2] cycloaddition between nitrous oxide and conjugated nitroalkenes were evaluated on the basis of the wb97xd/6-311 + G(d) (PCM) computational study.
Ewa Dresler   +2 more
doaj   +1 more source

A molecular density functional theory approach to electron transfer reactions

open access: yesChemical Science, 2019
Molecular density functional theory, an efficient computational tool, provides new insights into the study of electron transfer reactions in bulk and interfacial water.
Guillaume Jeanmairet   +4 more
openaire   +5 more sources

Machine learning electronic structure methods based on the one-electron reduced density matrix

open access: yesNature Communications, 2023
The theorems of density functional theory (DFT) establish bijective maps between the local external potential of a many-body system and its electron density, wavefunction and, therefore, one-particle reduced density matrix.
Xuecheng Shao   +3 more
doaj   +1 more source

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