A Theoretical Study of α-CFnH3-n -substituted Cyclopropyl Cations

1990 ◽  
Vol 45 (5) ◽  
pp. 730-732 ◽  
Author(s):  
Salim M. Khalil ◽  
Hayfa M. Jarjis
Keyword(s):  
Carbon Atom ◽  
Fluorine Atom ◽  
Theoretical Study ◽  
Type Orbital ◽  
Complete Optimization

Abstract MINDO-forces calculations are performed, with complete optimization of geometries, on α-Xcyclopropylcations, where X is CF3 , CF2H, and CFH2. It was found that the fluorine atom interacts with the localized empty Pπ-type orbital on α-carbon atom and forms a bridge with an angle 57.1 degree. Calculations also are performed on CF3-cyclopropyl anion and CF2H-cyclopropenyl cation. The fluorine atom in CF3 and CF2H shows no such interaction with the a-carbon atom because there is no localized empty Prc-type orbital

A Theoretical Study of Substituted Stepwise Fluorinated Cyclopropanone Keto-Enol System

2003 ◽  
Vol 58 (12) ◽  
pp. 749-755
Author(s):  
Abdullah El-Alali ◽  
Ali A. Marashdeh ◽  
Salim M. Khalil
Keyword(s):  
Theoretical Study ◽  
Dipole Moments ◽  
Heats Of Formation ◽  
Geometrical Parameters ◽  
Free Energies ◽  
Isodesmic Reactions ◽  
Orbital Energies ◽  
Substantial Concentration ◽  
Homo Lumo ◽  
Complete Optimization

MINDO-Forces calculations have been performed with complete optimization of the geometries on stepwise fluorinated cyclopropanones and their enols. Increase in the number of fluorine atoms causes destabilization of cyclopropanone. Perfluorinated enol was found to be present in substantial concentration, as was mentioned in previous work. This is supported by calculations of Gibbs free energies and isodesmic reactions. Geometrical parameters, heats of formation, electron densities, dipole moments and orbital energies (HOMO-LUMO) are reported.

scholarly journals THEORETICAL STUDY OF THE REACTION MECHANISM 1,2-ETHANEDIIOL WITH 1,3-DICHLOROPROPENE

2020 ◽  
Vol 2018 (1) ◽  
pp. 68-77
Author(s):  
Elena Chirkina ◽  
Leonid Krivdin ◽  
Nikolay Korchevin
Keyword(s):  
Carbon Atom ◽  
Chlorine Atom ◽  
Sulfur Atom ◽  
Density Functional ◽  
Theoretical Study ◽  
Thiol Group ◽  
Nucleophilic Attack ◽  
Substitution Product ◽  
Reaction Proceeds ◽  
Theoretical Mechanism

The theoretical mechanism of the interaction of 1,3-dichloropropene with 1,2-ethanedithiol in the system "hydrazine hydrate-KOH" has been proposed by the method of B3LYP / 6-311 ++ G (d, p) in the framework of the theory of the electron-density functional according to which the reaction proceeds successively in several stages, including the nucleophilic substitution of the chlorine atom present in the sp3-hybridized carbon atom with a sulfur atom to form a mono-substitution product that undergoes a prototropic allylic rearrangement that migrates the double bond to the sulfur atom, followed by closure in the dithiolane cycle due to the nucleophilic attack of the sulfide anion of the second thiol group of the reagent per carbon atom located in the γ-position with respect to the second chlorine atom.

scholarly journals Theoretical Study of Sigmatropic Rearrangement of Cycloprop-2-en-1-ol and its Fluorine Derivatives: Pericyclic or Pseudopericyclic Character from NICS and LLPE

2019 ◽  
Vol 31 (3) ◽  
pp. 597-601
Author(s):  
A. Sangeetha ◽  
A. Thaminum Ansari ◽  
Jebakumar Jeevanandam ◽  
S. Jayaprakash
Keyword(s):  
Oxygen Atom ◽  
Gas Phase ◽  
Energy Barrier ◽  
Fluorine Atom ◽  
Theoretical Study ◽  
Lone Pair ◽  
Sigmatropic Rearrangement ◽  
Nucleus Independent Chemical Shift ◽  
Lone Pair Electron ◽  
Rearrangement Reaction

Sigmatropic rearrangement reaction of cycloprop-2-en-1-ol and its fluorine derivatives has been studied theoretically in gas phase and its energy barrier has been calculated. Nucleus-independent chemical shift (NICS) shows sigmatropic rearrangement of cycloprop-2-en-1-ol is pericyclic in nature whereas fluorine derivatives show pseudopericyclic and pericyclic nature. Substitution of fluorine atom at ring is found to increase the energy barrier for –OH migration, while substitution at oxygen atom reduces the barrier. To know the involvement of lone pair of electrons during the reaction, lone pair electron present on oxygen atom is locked by hydrogen bonding. CR-CCSD(T)/6-311+G** levels are used to study the reactions more accurately.

A Theoretical Study of Fulvene Radical Anions

1991 ◽  
Vol 46 (3) ◽  
pp. 247-255 ◽  
Author(s):  
Salim M. Khalil ◽  
Hayfa M. Jarjis
Keyword(s):  
Theoretical Study ◽  
Dipole Moments ◽  
Heats Of Formation ◽  
Geometrical Parameters ◽  
Radical Anions ◽  
Optimization Of Geometry ◽  
Stabilization Effect ◽  
Complete Optimization ◽  
Spin Densities

AbstractMINDO-Forces calculations have been performed, with complete optimization of geometry on fulvene and X-fulvene radical anions, where X is OH, NH2, CH3, NO,2 CN, F, dimethyl and cyclopropyl. A twisted structure with angle 5° was found for fulvene anion. All substituents are stabilizing. The stabilization effect is more pronounced in the case of NO2, and very weak in the case of CH3. It was found that the substituents CH3 and CN show amphielectronic behaviour. Geometrical parameters, heats of formation, dipole moments, electron and spin densities are reported

scholarly journals Theoretical kinetic study of the formic acid catalyzed Criegee intermediate isomerization: multistructural anharmonicity and atmospheric implications

2018 ◽  
Vol 20 (16) ◽  
pp. 10806-10814 ◽  
Author(s):  
M. Monge-Palacios ◽  
Matti P. Rissanen ◽  
Zhandong Wang ◽  
S. Mani Sarathy
Keyword(s):  
Carbon Atom ◽  
Formic Acid ◽  
Kinetic Study ◽  
Theoretical Study ◽  
Isomerization Reaction ◽  
Hydrogen Shift ◽  
Acid Catalyzed ◽  
Double Hydrogen

We performed a theoretical study on the double hydrogen shift isomerization reaction of a six carbon atom Criegee intermediate (C6-CI), catalyzed by formic acid (HCOOH), to produce vinylhydroperoxide (VHP), C6-CI + HCOOH → VHP + HCOOH.

A theoretical study of fluorine atom and fluoride ion attack on methane and silane

1985 ◽  
Vol 107 (15) ◽  
pp. 4415-4419 ◽  
Author(s):  
Larry P. Davis ◽  
Larry W. Burggraf ◽  
Mark S. Gordon ◽  
Kim K. Baldridge
Keyword(s):  
Fluorine Atom ◽  
Theoretical Study ◽  
Fluoride Ion

ChemInform Abstract: A THEORETICAL STUDY OF FLUORINE ATOM AND FLUORIDE ION ATTACK ON METHANE AND SILANE

1985 ◽  
Vol 16 (45) ◽  
Author(s):  
L. P. DAVIS ◽  
L. W. BURGGRAF ◽  
M. S. GORDON ◽  
K. K. BALDRIDGE
Keyword(s):  
Fluorine Atom ◽  
Theoretical Study ◽  
Fluoride Ion

scholarly journals Neutral Rhenadicarbaboranes with Re(CO)2(NO) Vertices: A Theoretical Study of Building Blocks for Rhenacarborane-Based Drug Delivery Agents

Molecules ◽  
2019 ◽  
Vol 25 (1) ◽  
pp. 110 ◽  
Author(s):  
Amr A. A. Attia ◽  
Alexandru Lupan ◽  
Radu Silaghi-Dumitrescu ◽  
R. Bruce King
Keyword(s):  
Drug Delivery ◽  
Density Functional Theory ◽  
Carbon Atom ◽  
Related Species ◽  
Density Functional ◽  
Theoretical Study ◽  
Building Blocks ◽  
Rhenium Atom ◽  
Functional Theory

The rhenadicarbaborane carbonyl nitrosyls (C2Bn−3Hn−1)Re(CO)2(NO), (n = 8 to 12), of interest in drug delivery agents based on the experimentally known C2B9H11Re(CO)2(NO) and related species, have been investigated by density functional theory. The lowest energy structures of these rhenadicarbaboranes are all found to have central ReC2Bn−3 most spherical closo deltahedra in accord with their 2n + 2 Wadean skeletal electrons. Carbon atoms are found to be located preferentially at degree 4 vertices in such structures. Furthermore, rhenium atoms are preferentially located at a highest degree vertex, typically a vertex of degree 5. Only for the 9-vertex C2B6H8Re(CO)2(NO) system are alternative isocloso deltahedral isomers found within ~8 kcal/mol of the lowest energy closo isomer. Such 9-vertex isocloso structures provide a degree 6 vertex for the rhenium atom flanked by degree 4 vertices for each carbon atom.

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