What Do the Indices 6 and 13 Stand for in 6,13-Pentacenequinone?

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SUMMARY

The indices 6 and 13 in 6,13-pentacenequinone refer to the specific carbon atoms in the molecule where the oxygen substituents are attached. This nomenclature follows IUPAC standards, which can sometimes lead to atypical carbon numbering. A reference provided in the discussion outlines the basics of chemical nomenclature, aiding in the understanding of such designations. The clarification that carbons 6 and 13 are the ones with the oxygens attached resolves the initial confusion regarding their significance.

PREREQUISITES
  • Understanding of IUPAC nomenclature
  • Basic knowledge of organic chemistry
  • Familiarity with molecular structure representation
  • Ability to interpret chemical diagrams
NEXT STEPS
  • Study IUPAC nomenclature rules for organic compounds
  • Learn about the structure and properties of pentacenequinone
  • Explore the significance of substituent positions in organic molecules
  • Review resources on interpreting chemical structures and diagrams
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Chemistry students, organic chemists, and anyone interested in understanding chemical nomenclature and molecular structures will benefit from this discussion.

Pete99
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What do the indices 6 and 13 stand for in 6,13-pentacenequinone?

I know that is related to the position of the substituents in the molecule, but I cannot figure out how to interpret it.

Can some one point me to a reference where the basics the nomenclature are explained?

Thanks,
 
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This seems to cover it pretty well.

http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/nomen1.htm

We didn't cover things like this in O chem, but I can make a slightly educated guess, in hopes that someone more knowledgeable will come along.
Edit: I did a bit more research and got it. The carbons are numbered atypically. Oh well, that's typical IUPAC for you, I suppose.

The picture is now correct, showing that carbon 6 and carbon 13 are the ones with the oxygens attached.
 

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Thanks! Now it is clear.
 

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