Journal of Materials Physics and Chemistry
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Journal of Materials Physics and Chemistry. 2018, 6(1), 23-28
DOI: 10.12691/jmpc-6-1-4
Open AccessArticle

Cycloreversion of 4H-1,3-Thiazines and Selenazines Analogous: Theoretical Study by The Density Functional Theory (DFT) Method

Affoué Lucie Bédé1, , Soleymane Koné1, Mawa Koné1, Amon Benjamine Assoma1, Kicho Denis Yapo1, Boka Robert N’Guessan1, El Hadji Sawaliho Bamba1 and Thomas Yao N’Guessan1

1Laboratoire de Chimie Organique Structurale, Université Félix Houphouët-Boigny 22 BP 582 Abidjan 22 (Côte-d’Ivoire)

Pub. Date: June 11, 2018

Cite this paper:
Affoué Lucie Bédé, Soleymane Koné, Mawa Koné, Amon Benjamine Assoma, Kicho Denis Yapo, Boka Robert N’Guessan, El Hadji Sawaliho Bamba and Thomas Yao N’Guessan. Cycloreversion of 4H-1,3-Thiazines and Selenazines Analogous: Theoretical Study by The Density Functional Theory (DFT) Method. Journal of Materials Physics and Chemistry. 2018; 6(1):23-28. doi: 10.12691/jmpc-6-1-4


Experimental work has shown the possibility of cycloreversion of these heterocycles. In the case of 4H-1,3-thiazines, the possibilities of cycloreversion depend essentially on the nature of the substituent at the 4-position of the thiazine ring. Indeed, this reaction seems to be impossible with the methyl group in the 4-position but it is facilitated when the ethyl carboxylate group is at the same position. This difficulty does not occur with the selenium analogues. The density functional theory method at the level B3LYP/6-31G (d, p) was used to determine the influence of the heteroatom at position 1 on the cycloreversion reaction of these heterocycles. The thermodynamic and geometric parameters and the prediction of the reaction mechanism were developed in this work. The obtained results indicate a greater stability of the methylated thiazines in position 4. This would explain a difficulty of cycloreversion from these. These results also show a correlation between the reactivity of these heterocycles and their dipole moment.

cycloreversion activation energy (Ea) Intrinsic Reaction Coordinate (IRC) 4H-1 3-thiazines 4H-1 3-selenium

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