Lab #7 - Allan Wetzel November 15, 2007 GSI: Kapil Amarnath...

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Allan Wetzel November 15, 2007 GSI: Kapil Amarnath Lab #7- Nucleophilic Substitution Reactions of Alkyl Halides Write-up In part I of the lab, we observed bimolecular nucleophilic substitution in all but three of the substrates. We were able to tell a reaction took place when precipitate formed from the insoluble AgBr, AgCl, BrNa, and ClNa. I was surprised that 1-chloropentane did not undergo substitution because the halogen is attached to a primary carbon. Even though chlorine is not as good of a leaving group as bromine, we observed second order substitutions involving chlorine in other, secondary haloalkanes, and even in one tertiary haloalkane. Three of the reactions needed heat in order for the reaction to proceed forward in a reasonable time frame. By heating the mixture, we drastically increased the movement of the molecules, therefore creating more collisions per time frame, thus yielding a higher number of unhindered collisions that led to substitution reactions in that time frame than at room temperature. Some of the substrates had similar structures, with different halogens.
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This note was uploaded on 09/12/2008 for the course CHEM 3AL taught by Professor Li during the Fall '08 term at University of California, Berkeley.

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Lab #7 - Allan Wetzel November 15, 2007 GSI: Kapil Amarnath...

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