Why does the diene shown below fail to undergo a Diels-Alder reaction with even the most reactive dienophiles? 
Definitions:
Flying Buttresses
Architectural features consisting of external supports that transfer the thrust of a vault or roof to support piers, critical in the construction of Gothic cathedrals.
Pointed Arches
Architectural elements with pointed tops, characteristic of Gothic architecture, that allow for taller and more slender structures.
Humanist
A humanist is someone who emphasizes the value and agency of human beings, individually and collectively, often preferring critical thinking and evidence over acceptance of dogma or superstition.
Rhetoric
The art of effective or persuasive speaking or writing, especially the use of figures of speech and other compositional techniques.
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