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OChem: Naming Alkanes w/ Two Halogens

Discussion in 'DAT Discussions' started by informatique, May 31, 2008.

  1. informatique

    2+ Year Member

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    I just got "Organic Chemistry Odyssey" and started working on the problems.

    One nomenclature problem has:

    1) 2-bromo-3-flourobutane

    the other one is:

    2) 2-chloro-3-iodobutane

    ??????????

    Electronegativity= F>Cl>Br>I
    Molecular Weight = I>Cl>Br>F

    How am I supposed to name dihaloalkanes?? (*I took out R/S configurations...I just need to know the numbering)
     
  2. userah

    7+ Year Member

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    it's alphabetical. Chlorine before Iodine. Bromine before Fluorine
     
  3. Hugh Mannity

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    Alphabetical only if each substituent is equally far from the beginning of the end of the chain. Lowest number for first substituent is rule #1 for unbranched alkanes. If equal possibilities, then alphabetical.
     

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