Under photochemical conditions,(2E,4E)-hexadiene undergoes a ________ ring closure to yield ________.

Question

Quizplus · Accepted Answer

The given compound is a hexadiene which can undergo ring closure to form cyclobutene. The reaction occurs under photochemical conditions which indicates that it is a [2+2] cycloaddition reaction. The reaction can occur via either a conrotatory or disrotatory mechanism. In the case of (2E,4E)-hexadiene, the reaction occurs via a disrotatory mechanism where the two pi-bonds rotate in opposite directions. This leads to the formation of cis-3,4-dimethylcyclobutene. Therefore, the answer is C.

Under Photochemical Conditions,(2E,4E)-Hexadiene Undergoes a ________ Ring Closure to Yield