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OChem: Naming Alkanes w/ Two Halogens

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

  1. informatique

    informatique 2+ Year Member

    Mar 24, 2008
    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)
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  3. userah

    userah 7+ Year Member

    Aug 9, 2007
    it's alphabetical. Chlorine before Iodine. Bromine before Fluorine
  4. Hugh Mannity

    Hugh Mannity 2+ Year Member

    May 15, 2008
    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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