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Theoretical study of the mechanism of thieno[3,2-b]benzofuran bromination
* 1 , 1 , 2
1  Institute of Theoretical Physics and Astronomy of Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania
2  Department of Organic Chemistry, Prague Institute of Chemical Technology, Technicka 5, CZ-166 28 Prague 6, Czech Republic

Abstract: The bromination reaction of thieno[3,2-b]benzofuran was studied theoretically. Stationary points on the reaction potential energy profile including intermediates and transition states were successfully located employing hybrid DFT procedure at the B3LYP/6-31G* level of theory. The bromination proceeds in two steps at the C(2) carbon of thiophene ring. Initially, a p-complex forms between bromine molecule and thiophene ring. Further the p-complex with high activation barrier 69.9 kcal/mol transforms to s- complex intermediate. Finally the s-complex with 4.6 kcal/mol activation transforms to product 2-bromothieno[3,2-b]benzofuran.
Keywords: thieno[3,2-b]benzofuran, bromination, theoretical study, DFT