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Syn Anti Addition

Discussion in 'DAT Discussions' started by busupshot83, Apr 21, 2007.

  1. busupshot83

    busupshot83 S.D.N. Vet
    7+ Year Member

    Mar 22, 2003
    Likes Received:
    I came across the following alkene halogenation problems:

    alkene + Br2/CCl4 --> bromination via syn addition
    alkene + Cl2/CCl4 --> chlorination via anti addition

    Why do the halogens in each rxn add via different additions (syn and anti)? I was thinking both should be anti.
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  2. Lonely Sol

    Lonely Sol cowgoesmoo fan!
    10+ Year Member

    Dec 13, 2005
    Likes Received:
    Well wherever you got it from, does it say that Br2/ccl4- syn addition is a major product? If not, then thats correct

    Because, whenever you brominate or chlorinate an alkene, you have will have a mixture of two prodcuts, cis or trans, but one (anti) overpopulates the other (syn). Hope this makes sense!

    But if the book says syn is the major product, then I have to think about it!!

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