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7. The below reaction represents a formal [1,5]-sigmatropic alkyl shift. However, [1,5] alkylshifts are rarely observed, and the below reaction indeed does not proceed via a directs igmatropic rearrangement, instead, a series of three pericyclic reactions provide the final product. Draw a mechanism explaining the formation of the rearranged product. (3 marks)

Fig: 1

Fig: 2