Orgo Lab II Pre-lab. #13

Orgo Lab II Pre-lab. #13 - Laura Mooney Organic Chemist ry...

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Unformatted text preview: Laura Mooney Organic Chemist ry Lab I I Monday (12-4) P re-Laborato ry Assignment for Experiment # 13 Part A. approximately 1.2 g maleic anhydride Part B. 1. Measure 3 mL--approximately 2.5g--of eucalyptus oil in a graduated cylinder, then pour this into a tared 25 mL round bottom f lask. 2. Record the exact mass of the eucalyptus oil. 3. Dissolve the oil in 5 mL of anhydrous diethyl ether. 4. Add 1.2 g maleic anhydride to the round bottom f lask. 5. Reflux the mixture contained in the round bottom f lask over low steam for 45 minutes. 6. While the mixture is still warm, t ransfer it to a small beaker, cover with a watch glass, and allow cooling to room temperature. 7. Cool fur ther on ice before collecting crystals by vacuum filt ration. 8. Wash the crystals with 5 mL of cold petroleum ether. 9. Recrystallize the Diels-Alder product from methanol, by heating the methanol over a steam bath, and allowing the crystals to dissolve. 10. When crystals have dissolved, remove beaker from steam bath, and allow crystals to reform by allowing the mixture to cool to room temperature, then cooling fur ther with ice. 11. Measure the melting point of the crystal product, and set aside to dry for next laboratory period, where another reading for the melting point will be taken, and the dry crystal product will be tared. 12. Place a small amount of crystal product in a small test tube, and dissolve by stir r ing with a minimal number of drops of dichloromethane. 13. Draw out a few drops (approximately three) from this mixture with a Pasteur pipette, place them on a salt plate, and obtain a reading using the FT-IR spectrometer. 14. Clean the salt plate by r insing with dichloromethane. 15. Dispose of all byproducts in the appropriate waste containers, and clean up the work area. ...
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This note was uploaded on 05/08/2008 for the course CHEM 231 taught by Professor Staff during the Spring '00 term at BC.

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Orgo Lab II Pre-lab. #13 - Laura Mooney Organic Chemist ry...

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