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Naming cyclopentdiene

Posted: Thu Mar 16, 2017 6:55 pm
by Noor_Burney_1L
On page 29 of the Introduction to Organic Chemistry textbook it says that for Cyclopentdiene, because there is only one possible structure, numbering is not required.
How is there only one possible structure? The two possible names I had gotten were 1,3-cyclopentdiene and 1,4-cyclopentdiene. So, how is the name just cyclopentdiene rather than naming it as 1,3-cyclopentdiene?

Re: Naming cyclopentdiene

Posted: Thu Mar 16, 2017 9:15 pm
by Chem_Mod
The name you provided, 1,4-cyclopentdiene, is the same structure as 1,3-cyclopentdiene. Therefore we can simply say cyclopentdiene. 1,3-cyclopentdiene is more correct, though, as it uses lower numbers than 1,4. Again though, they are the same structure and so the numbers can be ignored.

Re: Naming cyclopentdiene

Posted: Thu Mar 16, 2017 10:19 pm
by Noor_Burney_1L
Okay thank you! Would it still be considered correct if I included the numbering and named it as 1,3-cyclopentdiene instead of cyclopentdiene, even though there is only one structure?