Abstract
Full geometric optimization of tetracyclo[7.2.1.0 4,11.0 6,10]dodeca-2,7-diene (TCDD) has been done by DFT/B3LYP methods and the structure of the molecule was investigated. The double bonds of TCDD molecule are endo -pyramidalized. The cationic intermediates and products obtained as a result of the addition reaction have been studied using B3LYP/6-311G(d,p) and B3LYP/6-311+G(d,p) methods. The bridged bromonium cation isomerised into the more stable N- and U-type cations and the difference between the stability of these cations is small. The N- and U-type reaction products are obtained as a result of the reaction which takes place over the cations in question. Although the U-type cation was 0.68 kcal mol −1 more stable than the N-type cation, the U-type product was 0.71 kcal mol −1 more stable than the N-type product.
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