The common structural feature among the C7-member bicyclic hydrocarbons, characterized by a cyclopentane ring fused to a cyclohexane (or cyclopentene) ring, is the triangular methano-bridge illustrated in Figure . These carbons can be classified into three distinct groups based on their chemical bonding nature: the flag carbon (C7), the bridge head carbons (C1 and C4), and the bottom carbons (C2, C3, C5, and C6). Norbornadiene (NBD) contains two non-conjugated C=C double bonds (C2=C3 and C5=C6), while NBN possesses a single C=C double bond (C2=C3).