(4) Hollowood, MA; McKervey, MA; Hamilton, R.; Rooney, JJ methods. 2 Attempts to functionalize 1 via direct substitution of CH bonds by using electrophilic or free-radical reagents have not been su~ cessful.~ The 13, 14-di-tertbutoxy derivative of 1 (ie, 2) has been synthesized via iron carbonyl promoted cyclodimerization of 7-tert- butoxynorbornadiene? and its structure has been confirmed via single-crystal X-ray ...