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Topic: Basic Mechanisms  (Read 3605 times)

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Offline Andy71600

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Basic Mechanisms
« on: October 21, 2007, 02:45:44 PM »
I am just learning the basics of SN2, E2, SN1, and E1 reaction mechanisms, and I am wondering whether the following reaction would even occur.

 1-bromopropane reacts with water

SN1 and E1 are probably not going to happen, and I cannot rationalize why Sn2 or E2 would either. Am I missing something or would this reaction not happen?

Thanks

Offline Andy71600

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Re: Basic Mechanisms
« Reply #1 on: October 21, 2007, 03:28:09 PM »
I am also having the same problem with: 1-bromopropane and trimethylphosphine.

Offline agrobert

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Re: Basic Mechanisms
« Reply #2 on: October 21, 2007, 04:17:19 PM »
Identify nucleophiles and electrophiles.  Then consider reaction conditions and equilibrium.  1-bromopropane with water is a solvolysis reaction, the reaction is driven by the solvation of bromine anion in water.  What mechanism would cause bromine to leave?  If water attacks the oxygen would have a +1 formal charge until it loses an acidic proton.  Think substitution.  For 1-bromopropane think about elimination.
In the realm of scientific observation, luck is only granted to those who are prepared. -Louis Pasteur

Offline Fry

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Re: Basic Mechanisms
« Reply #3 on: October 21, 2007, 04:19:46 PM »
nucleophillic substitution in both

Water is not a strong enough base to allow for the elimination route and phosphines are too good a nucleophiles to act as bases.

I think.

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