The following cycloaddition reaction was used in Woodward's total synthesis of reserpine. Note that the stereochemistry of the product shown is relative. (i) Name the reaction taking place and give a mechanism. (ii) Using the appropriate FMOs, show that this is a thermally allowed reaction. (iii) Use the Woodward Hoffman Rules to show that this reaction is thermally allowed. (iv) Explain the stereochemical outcome of the reaction