| The various mechanisms proposed for singlet oxygen (;Chapter two describes the reaction mechanism and regioselectivity of singlet oxygen ene reaction with trisubstituted alkenes. Various deuterium-substituted 2-methyl-2-butene isomers were synthesized and the photooxygenation results were determined by ;In chapter three, the ene reactions of singlet oxygen with propene, trans-, cis-butene, and tetramethylethylene were investigated theoretically using CASSCF and QCISD calculations. Intramolecular isotope effects were computed and then compared with experimental data.;Chapter four provides a detailed description of the theoretical studies on the ene reaction of triazolinedione with propene, trans-, cis-butene, and tetramethylethylene. Calculations were carried out at the RHF/6-31G;Chapter five, using density functional theory, explores the concerted and stepwise mechanisms of the Diels-Alder (DA) reactions of triazolinedione with s-cis- and s-trans-butadiene. |
