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Hydroboration of alkyne

Discussion in 'DAT Discussions' started by bigbutrealdreams, Aug 24, 2015.

  1. bigbutrealdreams

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    How come the product is cis? What's the reasoning?
    thanks
     

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  3. Endeross

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    because the bh3 comes in on one side and drops itself and a hydrogen in the mix on that same side. Look at this picture and see if you understand what i mean https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/Hydroboration_mechanism_in_alkene.png/759px-Hydroboration_mechanism_in_alkene.png

    Granted, this is an alkene but the idea is the same, It attaches at 2 points simultaneously which forces the methyls to go away from the H and B as they attach, this puts the methyl's cis to eachother
     
  4. bigbutrealdreams

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    EXCELLENT! THANKS
     

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