Abstract
AM1 semiempirical and B3LYP/6-31G(d)/AM1 DFT computational studies were performed with the aim to determine which 1,3,4-oxadiazoles would participate in Diels–Alder reactions as a diene and under which conditions. Variously substituted 1,3,4-oxadiazoles were selected for this study. Their reactivity was compared with cyclopentadiene since it is a traditional diene for the Diels–Alder reaction. The reactivity was evaluated through the frontier molecular orbital (FMO) energy gap between the pair of reactants, the energy changes in the FMO necessary to bring reactants to the transition state, and through activation barriers for cycloaddition. The stability of the cycloadduct was investigated and in some cases, a second addition of a dienophile was explored. The results were compared with experimental observations, and in this way, the reliability of the chosen computational approach was tested. All of our computational conclusions were in agreement with experimental observations for the reactivity of 1,3,4-oxadiazoles.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.