Substitution - Substitution Reactions of Alkyl Halides...

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Unformatted text preview: Substitution Reactions of Alkyl Halides Purpose: To examine the relative rates of various alkyl halides under Sn1 and Sn2 conditions. We will be examining Sn2 reactions with the Finkelstein reaction. The conditions for this are NaI in acetone. NaI is soluble in acetone but the products of the reaction; NaCl and NaBr are not. We will watch the reaction by looking for the first appearance of the solid salts. Acetone is a good solvent for Sn2 reactions because it is a polar aprotic solvent. We will be examining Sn2 reactions with an ethanolic solution of silver nitrate. The silver ion coordinates with a lone pair on the halogen which begins to weaken the carbon-halogen bond. In the rate determining step, the carbocation and solid silver halide is formed. We will monitor the reaction by looking for the formation of the solid. R X Ag + R X Ag R + + AgX Procedure: Sn2 Assemble and label six clean, dry test tubes. To follow the rates, it will be easier to react only four test tubes at a time. To each add a different alkyl halide (0.1 mL). To each test tube add 1 mL of a 1 M solution tubes at a time....
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This note was uploaded on 11/13/2011 for the course CHEM 12a taught by Professor Adamczeski during the Fall '10 term at San Jose City College.

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Substitution - Substitution Reactions of Alkyl Halides...

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