Concerted mechanism of intramolecular 1,1-cycloaddition reaction of allyldiazomethane

1981 ◽  
Vol 103 (3) ◽  
pp. 725-727 ◽  
Author(s):  
Tsutomu Miyashi ◽  
Yosuke Fujii ◽  
Yoshinori Nishizawa ◽  
Toshio Mukai
Keyword(s):  
Cycloaddition Reaction ◽  
Concerted Mechanism

scholarly journals Synthesis of tetrazole fused azepanes and quantum chemical topology study on the mechanism of the intramolecular cycloaddition reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (79) ◽  
pp. 50367-50371 ◽  
Author(s):  
M. S. Pino-Gonzalez ◽  
A. Romero-Carrasco ◽  
S. Calvo-Losada ◽  
N. Oña-Bernal ◽  
J. J. Quirante ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
Concerted Mechanism ◽  
Intramolecular Cycloaddition ◽  
Chemical Topology ◽  
Quantum Chemical Topology

Syntheses of novel tetrazolo azepanes by intramolecular 1,3-dipolar cycloaddition are described. Cyclization mechanistic topology study showed a pseudo concerted mechanism.

scholarly journals Theoretical Analysis of the Mechanism of the 1,3-Dipolar Cycloaddition of Benzodiazepine with N-Aryl-C-ethoxycarbonylnitrilimine

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Khadija Nabih ◽  
Mohamed Maatallah ◽  
Abdesselam Baouid ◽  
Abdellah Jarid
Keyword(s):  
Energy Barrier ◽  
Addition Reaction ◽  
Cycloaddition Reaction ◽  
Reaction Medium ◽  
Dft Method ◽  
High Energy ◽  
Dipolar Cycloaddition ◽  
Concerted Mechanism ◽  
Heat Released ◽  
Good Agreement

In this work, the mechanism and regio- and no-periselectivity of the 1,3-dipolar cycloaddition reaction of 2,4-dimethyl-3H-1,5-benzodiazepine with N-aryl-C-ethoxycarbonylnitrilimine have been studied using the DFT method at the B3LYP/6-31G(d) level of theory. IRC calculations and activation energies show that this reaction follows an asynchronous concerted mechanism. The two C=N sites of 2,4-dimethyl-3H-1,5-benzodiazepine are easily reached by the dipole, and the energy barrier between the reagents and the transition states is too weak. The secondary barriers are traversed by the heat released in the reaction medium after the crossing of the first TS, which facilitates the addition reaction and does not require high energy. The obtained results of this study are in good agreement with experimental outcomes.

Theoretical Study for the [2+2] Cycloaddition Reaction Mechanism of Ketenes and their Derivatives

2019 ◽  
Vol 35 (5) ◽  
pp. 1550-1556 ◽  
Author(s):  
Haydar A ◽  
Mohammad- Salim ◽  
Hassan H Abdallah
Keyword(s):  
Activation Energy ◽  
Room Temperature ◽  
Theoretical Study ◽  
Cycloaddition Reaction ◽  
Stationary Points ◽  
Concerted Mechanism ◽  
Fukui Functions ◽  
Carbon Centers ◽  
Local Properties ◽  
Global And Local

This study presents the intramolecular [2+2] cycloaddition reaction of ketenes to form cyclobutanones using B3LYP-D3/6-311++G(d,p) level of approximation. The concerted mechanism path was studied in detail. The structures of all intermediates and transition states were located using same level of theory. The influences of the substituents (-H, -CH3, -NH2, -F, -OH and –CN) were also discussed. The analysis of stationary points and the energetic parameters indicates that the substituted ketene with –CN group has the highest activation energy; however, ketene with –NH2 group has the lowest one. Conversely, in-tramolecular [2+2] cycloaddition records the highest degree of asynchronicity with –NH2 group and lowest with –CN group. The calculated thermodynamic parameters at room temperature have been listed and analyzed. The global and local properties of reactants involved in the intramolecular [2+2] cycloaddition reactions and the Fukui functions for an electrophilicity and local electrophilicity were also elucidated for carbon centers of each reactant.

Tuning the configuration of the flexible metal–alkene-framework affords pure cycloisomers in solid state photodimerization

2021 ◽  
Author(s):  
Yong Wang ◽  
Meng-Fan Wang ◽  
David James Young ◽  
Hua Zhu ◽  
Fei-Long Hu ◽  
...  
Keyword(s):  
Solid State ◽  
Cycloaddition Reaction ◽  
Guest Molecules ◽  
Flexible Metal

The bulkiness of the guest molecules influences the conformations of the ligand and the final outcomes of the cycloaddition reaction.

New Pyrrolo[1,2-b]pyridazine Derivatives by 1,3-Dipolar Cycloaddition of Mesoionic Oxazolopyridazinone

2008 ◽  
Vol 59 (11) ◽  
Author(s):  
Miron Teodor Caproiu ◽  
Florea Dumitrascu ◽  
Mino R. Caira
Keyword(s):  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
Pyridazine Derivatives ◽  
New Compounds

New pyrrolo[1,2-b]pyridazine derivatives 8a-f were synthesized by 1,3-dipolar cycloaddition reaction between mesoionic 1,3-oxazolo[3,2-b]pyridazinium-2-oxides and diethyl or diisopropyl acetylenedicarboxylate as alkyne dipolarophiles. The structures of the new compounds were assigned by elemental analysis and NMR spectroscopy.

Synthesis of 2-(Substituted-silyl)thiophene-3-carboxylates via a Facile [3+2] Cycloaddition Reaction Catalyzed by Potassium tert-Butoxide

2016 ◽  
Vol 13 (7) ◽  
pp. 467-473 ◽  
Author(s):  
Yi-Nan Cheng ◽  
Wen-Bo Jin ◽  
Li-Min Wang ◽  
Shu-Jun Sun ◽  
Gui-Ying Xie ◽  
...  
Keyword(s):  
Cycloaddition Reaction

Copper-catalyzed Convenient Synthesis and SAR Studies of Substituted-1,2,3-triazole as Antimicrobial Agents

2018 ◽  
Vol 16 (1) ◽  
pp. 3-10
Author(s):  
Aniket P. Sarkate ◽  
Kshipra S. Karnik ◽  
Pravin S. Wakte ◽  
Ajinkya P. Sarkate ◽  
Ashwini V. Izankar ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antifungal Activity ◽  
Antimicrobial Agents ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
One Pot ◽  
Triazole Derivatives ◽  
Sar Studies ◽  
Convenient Synthesis ◽  
Antibacterial And Antifungal

Background:A novel copper-catalyzed synthesis of substituted-1,2,3-triazole derivatives has been developed and performed by Huisgen 1,3-dipolar cycloaddition reaction of azides with alkynes. The reaction is one-pot multicomponent.Objective:We state the advancement and execution of a methodology allowing for the synthesis of some new substituted 1,2,3-triazole analogues with antimicrobial activity.Methods:A series of triazole derivatives was synthesized by Huisgen 1,3-dipolar cycloaddition reaction of azides with alkynes. The structures of the synthesized compounds were elucidated and confirmed by 1H NMR, IR, MS and elemental analysis. All the synthesized compounds were tested for their antimicrobial activity against a series of strains of Bacillus subtilis, Staphylococcus aureus and Escherichia coli for antibacterial activity and against the strains of Candida albicans, Aspergillus flavus and Aspergillus nigar for antifungal activity, respectively.Results and Conclusion:From the antimicrobial data, it was observed that all the newly synthesized compounds showed good to moderate level of antibacterial and antifungal activity.

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