10

If you use "cyclopenta-1,3-diene" in the end of the name (your first attempt), then this would be the stem system. In case like the one presented in the question -- two rings connected via a single bond -- it is recommended to recognize the cyclohexene as the stem (like parent), and the cyclopentadienyl moiety as a substituent (like child). ...


9

You have two choices for choosing the parent hydride here in this case. 1. Choosing the cyclohexene ring as the parent hydride If we consider the cyclohexene ring as the parent hydride, we get the cyclopentadiene ring to be a substituent leading the name to become 1-(cyclopenta-1,3-dien-1-yl)cyclohex-1-ene 2. Choosing the cyclopentadiene as the parent ...


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