What diene and what dieneophile could be used to prepare the following? 
Definitions:
Operation Of Law
Legal changes that occur automatically by application of law, without requiring action by any party.
War Breaks
Sudden onset of warfare or hostilities between nations or groups.
Travel Ban
Government-imposed restrictions on travel to or from specific countries or regions, often implemented for reasons related to public health, safety, or national security.
Liability
A legal obligation to compensate for the harm or damage one's actions have caused.
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