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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Tuesday, January 03, 2012

Markovnikov's Rule

The rich gets richer, the poor gets poorer. We can say that statement as the Markovnikov's rule. What is Markovnikov's Rule? First let's see the picture as follows:

Why 1-Bromopropane (almost) didn't observed? Why 2-Bromopropane is the dominant production in this addition reaction?
Markovnikov's Rule is our savior in this problem.

We have to know the mechanism reaction of that addition reaction above first.

See the two carbocations formed in the intermediate state. To stabilize the carbocation, induction and hyperconjugation effect are both needed. The secondary carbocation has 2 induction and 6 hyperconjugation effect but the primary carbocation has 1 induction and 2 hyperconjugation effect.

From the descriptions above, we know that the most stable carbocation in this addition is the secondary carbocation. This is what Markovnikov's rule is.

(Source: http://www.youtube.com/watch?v=EWOvFAu8FmA)

Documents of Pelatnas I IChO 2012

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