Electron transference in hemolytic aromatic substitution reactions

1970 ◽  
Vol 48 (6) ◽  
pp. 1019-1020 ◽  
Author(s):  
Dennis D. Davis ◽  
Fauzia Y. Ahmed
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Transition State ◽  
Substitution Reaction ◽  
Methyl Radicals ◽  
Aromatic Substitution ◽  
Substitution Reactions ◽  
A Charge ◽  
Homolytic Substitution

The selectivity of methyl radicals in the homolytic substitution reaction on naphthalene was studied as a function of solvent. The selectivity decreases as the solvent dielectric increases. A possible explanation of these effects based upon a charge-transfer contribution to the transition state leading to σ-complex formation is offered.

Enantioselective Nucleophilic Aromatic Substitution Reaction of Azlactones to Synthesize Quaternary α-Amino Acid Derivatives

Synlett ◽  
2020 ◽  
Author(s):  
Xiaohua Liu ◽  
Yi Li ◽  
Hao Pan ◽  
Wang-Yuren Li ◽  
Xiaoming Feng
Keyword(s):  
Hydrogen Bonding ◽  
Charge Transfer ◽  
Amino Acid ◽  
Substitution Reaction ◽  
Nucleophilic Aromatic Substitution ◽  
Amino Acid Derivatives ◽  
Amino Acid Esters ◽  
Aromatic Substitution ◽  
Charge Transfer Interaction ◽  
Acid Esters

AbstractAn asymmetric organocatalytic nucleophilic aromatic substitution reaction of azlactones with electron-deficient aryls was established. A variety of α-aryl α-alkyl α-amino acid esters and peptides were obtained in decent yields and stereoselectivities. A new bifunctional catalytic mode involving charge-transfer interaction and hydrogen bonding is proposed to explain the enantioselectivity.

DFT Investigation of a Charge-Transfer Complex Formation Between p-Phenylenediamine and 3,5-Dinitrosalicylic Acid

2019 ◽  
Vol 60 (12) ◽  
pp. 1906-1916 ◽  
Author(s):  
A. S. Athmani ◽  
F. Madi ◽  
I. Laafifi ◽  
M. Cheriet ◽  
N. Issaoui ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Charge Transfer Complex ◽  
A Charge

Arrhenius Parameter for Some Gas-phase Cycloaddition Reactions of Singlet Molecular Oxygen

1974 ◽  
Vol 52 (20) ◽  
pp. 3544-3548 ◽  
Author(s):  
R. D. Ashford ◽  
E. A. Ogryzlo
Keyword(s):  
Charge Transfer ◽  
Transition State ◽  
Gas Phase ◽  
Molecular Oxygen ◽  
Rate Constants ◽  
Arrhenius Equation ◽  
Arrhenius Parameter ◽  
Singlet Molecular Oxygen ◽  
Charge Transfer Interaction ◽  
A Charge

Rate constants have been determined for several reactions of O2(1Δg) in the gas phase, at temperatures between 300 and 550 °K. The following values were obtained when the data was fitted to the Arrhenius equation:[Formula: see text]A charge-transfer interaction in the transition-state is invoked to account for the data available for such reactions.

Dynamics of a gas-phase SNAr reaction: non-concerted mechanism despite the Meisenheimer complex being a transition state

2020 ◽  
Vol 22 (45) ◽  
pp. 26562-26567
Author(s):  
Nishant Sharma ◽  
Rupayan Biswas ◽  
Upakarasamy Lourderaj
Keyword(s):  
Transition State ◽  
Gas Phase ◽  
Substitution Reaction ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Concerted Mechanism ◽  
Snar Reaction

Multi-step roaming pathway in the nucleophilic aromatic substitution reaction involving a Meisenheimer transition state.

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