The thermal Diels-Alder reaction can occur through the interaction of the HOMO of the diene and the LUMO of the dienophile. Can the reaction also occur through the interaction of the HOMO of the dienophile and the LUMO of the diene? Using 1,3-butadiene and ethylene as your model system, provide orbital diagrams to support your answer.
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The state where countries and regions are interconnected economically, politically, and socially, making them dependent on each other to various extents.
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