Rates of SN- 2 reactions, 3-Bromo pentan2-one shows very large rates of Sn-2 substitution rate in comparison to 2-bromo but

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Title: Rates of SN- 2 reactions

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Posted On: Feb 08, 2012 02:15 AM

3-Bromo pentan2-one shows very large rates of Sn-2 substitution rate in comparison to 2-bromo butane. Why ???

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Swapnil Saxena
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Shashwat Tiwari

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Feb 08, 2012 06:55 AM

Because of -M (withdrawing) effect of ketone group, 3-Bromo Pentan-2-one has high partial positive charge on the carbon attatched to bromine, due to which neucleophile will have high tendency to attack, before bromine can leave, hence SN2 reaction takes place..........

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