IUPAC Naming Questions-Substituents and Bonds

  1. Hi all, couple of questions in the Official IUPAC naming rules for organic compounds:

    1. How do I name organic molecules with both double/triple bonds and substituent? Do I name Both? For ex.: 2-Methyl-4-pentene vs. 2-Methylpentene?
    2. If the double/triple bond and the substituent is in the same respective positions for either direction of the numbering, which is preferred? For example, for 2-Methyl-4-pentene (not sure if this is right yet, but...), is 4-Methyl-1-Pentene more correct as it has a numbering system with overall lower numbers? (4+1<2+4)

    Thank you.
  2. jcsd
  3. DrClaude

    DrClaude 2,403
    Science Advisor
    Homework Helper
    Gold Member

    You must number the double bond, and the double bond has precedence when numbering. The correct name is therefore 4-methyl-1-pentene.
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