LAB1 - Chem3B

LAB1 - Chem3B - Shayna Russell Chem 3BL 312 The Magtrieve...

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Shayna Russell Chem 3BL 312 The Magtrieve oxidation of 4-Chlorobenzyl Alcohol: A “Solvent Free” Reaction February 11, 2009 RESULTS AND DISCUSSION The purpose of this lab was to successfully oxidize the alcohol 4-chlorobenzyl alcohol into the aldehyde 4-chlorobenzaldehyde through the use of the reagent Magtrieve, or CrO 2 . The balanced equation for this reaction is as follows: 1 mmole 4-chlorobenzyl alcohol + 2 mmoles CrO 2 1 mmole 4-chlorobenzaldehyde + 2 mmoles CrO(OH). 711 mg of the black-powdered Matrieve was weighed and combined with 142 mg of the white-powdered alcohol into a 30-mL beaker. The beaker was placed in a sandbath and heated over a period of thirty minutes approximately 5 degrees below 110 ° C. A watch glass was placed on top of the beaker and filled with ice. A Pasteur pipette was used to drain the watch glass of excess melted water and the ice was continually replaced. About 15 minutes into the condensation process, small white crystals of the aldehyde began to form under the watch glass. After
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