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Diels-Alder reactivities of cycloalkenediones with tetrazine.
Journal of Molecular Modeling 2019 January 10
Quantum chemical calculations were used to investigate the Diels-Alder reactivities for a series of cycloalkenediones with tetrazine. We find that the reactivity trend of cycloalkenediones toward tetrazine is opposite to cycloalkenes. The electrostatic interactions between the cycloalkenediones and tetrazine become more stabilizing as the ring size of the cycloalkenediones increases, resulting in lower activation energies. The origin of the more favorable electrostatic interactions and the accelerated reactivities of larger cycloalkenediones result from a stabilizing CH/π interaction that is not present in the reaction of the 4-membered cycloalkenedione. The Diels-Alder reactivity trend of cycloalkenediones toward tetrazine is opposite that of cycloalkenes. The increased reactivity of the 5- and 6-membered cycloalkenediones relative to the 4-membered cycloalkenedione is attributed to a stabilizing electrostatic CH/π interaction that is not present in the reaction of the 4-membered cycloalkenedione. Graphical abstract The Diels-Alder reactivity trend of cycloalkenediones towards tetrazine is opposite of cycloalkenes. The increased reactivity of the 5- and 6-membered cycloalkenediones relative to the 4-membered cycloalkenedione is attributed to a stabilizing electrostatic CH/π interaction that is not present in the reaction of the 4-membered cycloalkenedione.
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