Compound U can undergo sequential electrocyclic ring closing reactions to yield compound W through intermediate V as shown in Figure 6. OH HO H A A V OH H W OH U Figure 6 Draw tha structure of intermediate V, where U undergoes the initial electrocyclic ring closure under thermal conditions. Include the appropriate stereochemistry in your answer and account for the stereochemical outcome in terms of the Woodward Hoffman rules. (ii) Show the mechanism by which compound V is formed. Predict how the stereochemistry of V would differ had this initial reaction been conducted under photochemical conditions. (iv) Account for the stereochemistry observed in compound W in terms of the Woodward Hoffman rules and draw the mechanism by which compound Wis formed