Progress In Reaction Kinetics And Mechanism, ( ISI ), Volume (39), No (3), Year (2014-6) , Pages (233-248)

Title : ( 1,3-Dipolar cycloaddition reactions between ethyl diazoacetate and substituted alkynes: A density functional theory study )

Authors: javad tajabadi , Mehdi Bakavoli , Mostafa Gholizadeh , Hossein Eshghi , Amir khojastehnezhad golmakani ,

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A theoretical study on the reactivity and regioselectivity of 1,3-dipolar cycloaddition reactions of ethyl diazoacetate (EDA) with ethynes (CH ≡ CX, X = H, CH3, n‑But, CF3, CO2Et, C6H5, p‑CH3OC6H4 and p‑NO2C6H4) has been carried out by means of several theoretical approaches, activation energies, frontier molecular orbital (FMO) theory, conceptual density functional theory reactivity indices and hard and soft acid and base theory. Potential energy surface analysis and intrinsic reaction coordinate calculations show that these cycloadditions follow an asynchronous concerted mechanism with a low or non-polar character, displaying C‑regioselectivity. Moreover, the reaction of EDA with electron-deficient alkynes is faster compare to electron-rich ethynes. Reactions of EDA with electron-deficient and electron-rich alkynes are normal electron demand and inverse electron demand cycloadditions, respectively,because of moderate electrophilicity and nucleophilicity of EDA. This result is confirmed by FMO analysis and reactivity indices.

Keywords

, 1, 3-dipolar cycloaddition, ethyl diazoacetate, substituted alkynes, regioselectivity, density functional theory reactivity indices, frontier molecular orbital
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@article{paperid:1042948,
author = {Tajabadi, Javad and Bakavoli, Mehdi and Gholizadeh, Mostafa and Eshghi, Hossein and Khojastehnezhad Golmakani, Amir},
title = {1,3-Dipolar cycloaddition reactions between ethyl diazoacetate and substituted alkynes: A density functional theory study},
journal = {Progress In Reaction Kinetics And Mechanism},
year = {2014},
volume = {39},
number = {3},
month = {June},
issn = {1468-6783},
pages = {233--248},
numpages = {15},
keywords = {1;3-dipolar cycloaddition; ethyl diazoacetate; substituted alkynes; regioselectivity; density functional theory reactivity indices; frontier molecular orbital analysis},
}

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%0 Journal Article
%T 1,3-Dipolar cycloaddition reactions between ethyl diazoacetate and substituted alkynes: A density functional theory study
%A Tajabadi, Javad
%A Bakavoli, Mehdi
%A Gholizadeh, Mostafa
%A Eshghi, Hossein
%A Khojastehnezhad Golmakani, Amir
%J Progress In Reaction Kinetics And Mechanism
%@ 1468-6783
%D 2014

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