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Reduction_of_9Fluorenone_1

Reduction_of_9Fluorenone_1 - EXPERIMENT#5 Reduction of...

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PRE-LAB EXERCISE: In addition to your normal pre-lab write-up in your lab notebook, write the balanced chemical equation for the conversion of (9-fluorenone to fluorenol. EXPERIMENTAL: Work with a partner. Dissolve 0.6 g fluorenone in a 50 mL flask containing 6 mL of methanol. Warm as needed to dissolve the ketone. Note the color. Cool the solution to room temperature. Add 0.05 g NaBH 4 to the solution with swirling, wait 20 minutes, Note the color. Continue adding small increments of NaBH 4 until the solution stays colorless. Add 2 mL of 3M H 2 SO 4 . Heat solution containing the newly formed white ppt. on a steam bath 10 minutes, stirring now and then, adding small amounts of methanol until all the solid dissolves. Cool the solution to room temperature, then in an ice bath for 15 minutes. Collect the white solid by vacuum filtration. Wash the solid until the filtrate is neutral. Do Not Waste Litmus Paper. Allow the solid to air dry until next week. Determine the melting point, and calculate the percentage yield of the crude product. Purify the crude product by
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