Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Markownikoff's rule

  1. Oct 16, 2005 #1
    looked in books/googled for info about this...i know what it IS, but don't understand why it happens. anyone?
  2. jcsd
  3. Oct 16, 2005 #2


    User Avatar
    Science Advisor

    Originally it was based on empirical evidence (it was just the product that you got from certain reactions) and was used as a predictive tool. It can be rationilized by thinking about the intermediates of a reaction mechanism. If a carbocation is formed then it will be more stable at the more substituted carbon and therefore a nucleophile would be more likely to attack at that position.
  4. Oct 17, 2005 #3
    Well, I ain't sure of this but consider a 1-Methyl-2-butene. When HCl adds across the double bond, Cl radical will attract the electrons of the C=C towards itself creating a partial +ve charge on the C atoms. This partial positive charge is handled better by a 3rd degree C atom than the 2nd degree C atom. Thus the -ve part of the addendum will go the the C with more substituents, which is the Markonikov's rule.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Similar Threads for Markownikoff's rule Date
Bent's rule for bond length Aug 10, 2015
Fluoroalkanes, and Zaitsev's rule Feb 23, 2015
Saytzeff and Hoffman's rule Feb 16, 2015
Question about the octet rule Mar 28, 2014