The reaction sequence shown below is an interesting method for turning alcohols into iodide leaving groups. in the first step, the compound catechol (you might recognize the name – it is the basic building block for catecholamines such as dopamine, epinephrine, and norepinephrine) is allowed to react with pcl3, which is the chlorine analog of pbr3, in pyridine to form a reactive bicyclic intermediate, compound a. draw a complete curved‐arrow mechanism for this transformation, and fill in the box with the structure of compound a. the molecular formula is given to you check your work.