O'chem Lab 2 - Preparation of Cyclohexene from...

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Preparation of Cyclohexene from Cyclohexanol. Purpose : The purpose of this experiment is the dehydration of cyclohexanol and the removal of cyclohexene. In this experiment, the cyclohexanol undergoes acid-catalyzed dehydration to give cyclohexene. The product is distilled from the reaction flask along with the water generated. Toluene is used as a chaser solvent. The distillate is washed with the salt solution, dried and fractionally distilled. Procedure : 1. Add 20 grams of cyclohexanol, 5 mL of 85% phosphoric acid, and a boiling chip in a 100 mL round bottom flask. Shake well to mix the layers. 2. Set up the fractional distillation apparatus using figure 19.2 from the book as a guide. Make sure you place a collection vessel in an ice bath during the distillation process. 3. Distill until about 5 to 10 mL of material is left in the round bottom flask. Remember to record the temperature at the first drop and the last drop. 4. The collected substance in the beaker is the cyclohexene. The substance in the round bottom flask is Toluene and phosphoric acid. 5. Add 20 mL of Toluene to the round bottom flask thought the distillation column. Make sure to add Toluene to the round bottom flask from the top of the column so that the apparatus will not be disturbed and Toluene will not mix with the distillate bring collected at the other end of the apparatus. 6. Distill again until half of the contents from the round bottom flask are distilled.
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O'chem Lab 2 - Preparation of Cyclohexene from...

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