Kinetics and mechanism of the Barton–Kellogg olefination: a computational DFT study using CTST theory and topological approaches

Gibbs energies (kcal mol−1) for the BK reaction starting from R1 and R2, calculated at the MN15-L/Def2-TZVP level of theory in toluene as solvent (SMD) at 298 K for the first step and at 383.6 K for the consecutive steps.

Closer Investigation of the Kinetics and Mechanism of Spirovinylcyclopropyl Oxindole Reaction with 3Σ-g-O2 by Topological Approaches and Unraveling the Role of the I2 Catalyst

In this investigation at the MN15L/Def2-TZVP level of theory, we present computational evidence indicating that the reaction of ³Σ^-g-O₂ with spirovinylcyclopropyl oxindole (2) leads to a product called spiro-1,2-dioxolane (2) in its singlet state; this reaction occurs via a stepwise mechanism and its rate-determining step is catalyzed by iodine radicals, which promotes opening of the three-membered ring under dark conditions. The conversion of 2 to 1-benzylindoline-2,3-dione (3) and 2-vinyloxirane (4) takes place via a concerted and slightly asynchronous reaction. Both electron localization function and AIM topological analysis reveal that the step associated with the attack of the ³Σ^-g-O₂ molecule on the intermediate ³MC characterizes the formation of the only new O₂-C₃ single bond, which occurs in a stepwise mechanism, in contrast to the Δg-O₂ reaction with ¹5 species.

Understanding the molecular mechanism of the stereoselective conversion of N-trialkylsilyloxy nitronates into bicyclic isoxazoline derivatives

The conversion of N-trialkylsilyloxy nitronates into bicyclic isoxazoline derivatives has been explored using the density functional theory method within the context of molecular electron density theory at the ωB97XD(PCM)/6-311G(d,p) level.