THEORETICAL STUDY OF CONCERTED DIELS-ALDER REACTIONS BETWEEN DIMETHYL 1,2,4,5-TETRAZINE-3,6-DICARBOXYLATE AND DIENOPHILES

Salih Shihab, Mehdi; Mohamad Ali Mahmood, Shaima; Kadhum Shneine, Jewad

	THEORETICAL STUDY OF CONCERTED DIELS-ALDER REACTIONS BETWEEN DIMETHYL 1,2,4,5-TETRAZINE-3,6-DICARBOXYLATE AND DIENOPHILES
Journal of Al-Nahrain University - Science
Article 1, Volume 12, Issue 1, 2009, Pages 14-23
Authors
Mehdi Salih Shihab; Shaima Mohamad Ali Mahmood; Jewad Kadhum Shneine
Abstract
Computational study at different levels of quantum calculations (AM1, PM3 and ab initio (HF/3-21G)) where preformed on the inverse-demand synchronous concerted Diels-Alder reactions between dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate as a diene and a variety of dienophiles (ethylene, cyclopentadiene, 1-hexene, cyclohexene). All the molecular structures (reactants, transition states, intermediates and adducts) were optimized by AM1 method. The calculated energies and volumes showed that the cycloaddition systems followed a mechanism by formation an intermediate and proceed to eject N2 molecule and ended by 1,2-hydrogen shift adduct. The prediction of the reaction energies of modeling of the cycloaddition reactions under-study by semiempirical AM1 method showed a good agreement with the experimental data comparing with PM3 and HF/3-21G. whereas, the prediction of activation energies by (AM1, PM3 and ab initio (HF/3-21G)) showed overestimated values comparing with experimental data.

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