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Considering 1,3-butadiene (below) added to bromine water (considering it as $\ce{Br2(aq)}$): enter image description here

I've seen online that the products are 1,2-dibromobutene and 1,4 enter image description here

but what I don't understand is why wouldn't the other double bond undergo substitution again? They're on a carbon chain like normal so shouldn't they react with the bromine water too? Is something stopping it?

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  • $\begingroup$ Given enough time and Br2, it would. $\endgroup$ – Ivan Neretin Aug 7 '19 at 12:45
  • $\begingroup$ Please don't use MathJax in titles. $\endgroup$ – Zhe Aug 7 '19 at 14:03
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If reaction is carried out in 1:1 ratio of Br2 and 1,3 Butadiene, then the above two products will be formed. If more Br2 is taken, then surely 4 positions will be brominated.

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  • $\begingroup$ Why answer a question that has already been answered by @Ivan Neretin in a comment? $\endgroup$ – user55119 Aug 7 '19 at 14:09
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    $\begingroup$ @user55119 because a comment is not an answer. $\endgroup$ – Stian Yttervik Aug 8 '19 at 5:50

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