WebA revision of the most typical examples used to illustrate the existence of secondary orbital interactions (SOI) has been achieved, but analysis indicates that no conclusive evidence … Web15 Jan 2007 · The first view is that the secondary orbital interaction plays a dominating role in the stereoselectivity of cyclopropene Diels-Alder reactions [12][13][14] [15]. The second …
1,3-dipolar cycloaddition reactions HOMO—LUMO interactions
WebWeak SOI effects are found to be operative in the endo‐TSs involved in the cycloadditions of cyclic alkenes, cyclopropene, aziridine, cyclobutene, and cyclopentene, … WebThe reaction is carried out according to the synergistic reaction cis-addition, giving priority to the formation of endo-addition products (the endo rule). In the electron-required Diels … ibd with diarrhea treatment
Origin of the α-Effect in S N 2 Reactions - Wiley Online Library
WebSecondary orbital interactions have also been invoked to explain regiochemistry as well as stereochemistry. Whereas 1 - substituted dienes sometimes have only a small difference between the coefficients on C-l and C-4 in the HOMO, they can have a relatively large difference between the coefficients on C-2 and C-3. WebFurthermore, though the exo-product is the more thermodynamically stable isomer, there are secondary (non-bonding) orbital interactions in the endo- transition state, lowering its … Web1 Jan 2024 · We theoretically investigated the effect of a new type of twisting phase on the polarization dynamics and spin–orbital angular momentum conversion of tightly focused scalar and vector beams. It was found that the existence of twisting phases gives rise to the conversion between the linear and circular polarizations in both scalar and … ibdwssbm