Exp 11 (CHEM3105)

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Texas Tech University *

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3105

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Chemistry

Date

Dec 6, 2023

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docx

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Kelby Robinson Lab Partner: Ashlyn Sneed November 18, 2020 3105-342 Zhang Experiment 11: Dehydration of Cyclohexanol (E1) Purpose: To synthesize, purify and analyze the product of cyclohexanol; converts cyclohexanol to cyclohexene via an E1 rxn Rxn & Physical Properties: Safety: Cyclohexanol: page did not load Phosphoric acid: corrosive w/ metals, skin/eye irritation/damage Sulfuric acid: corrosive w/ metals, skin/eye irritation/damage, target organs & resp. system Anhydrous magnesium sulfate: page failed to load Bromine dichloromethane: page failed to load Sodium carbonate : n/a Dichloromethane: page failed to load Cyclohexene: page failed to load Procedure: add 8 mL of cyclohexanol and boiling stone to 50mL flask; TA will add 2.5 mL 85% phosphoric acid and 5-8 drops of H 2 SO 4 . Heat the reaction mixture starting with a hotplate setting of 350 o C. Cool the receiving flask in an ice bath.
Kelby Robinson Lab Partner: Ashlyn Sneed November 18, 2020 3105-342 Zhang Continue the distillation until about 2-3 mL of liquid remain; temp @ the thermometer should also drop transfer the distillate to a separatory funnel and extract it with 3 mL of 0.5 M Na 2 CO 3 .; swirl the mixture without the stopper in place until there is no gas evolution Extract the organic phase in the separatory funnel with ~3 mL of brine dry the organic phase with anhydrous magnesium sulfate transfer the dried organic phase to a small flask and distill it into a clean dry pre- weighed flask Start with a hotplate setting of 200 o C. The distillation temperature should not exceed 83 degrees C Dry the outside of the collection flask and weigh by difference to get the purified product yield Obtain an IR spectrum of the purified product. Part Two: To two vials, add 4 drops of cyclohexanol to one and 4 drops of your product to the other. To each vial, add 2-3 drops of bromine in dichloromethane dropwise. Observe any color changes. resulting mixtures should be disposed of in the halogenated waste container. Data/Observations: The cyclohexane turned yellow Results/Calculations: Even though my lab partner attended this lab, I think that she did a good job at collecting data, and making sure we did the e1 rxn correct. In our experiment our cyclohexane turned yellow. (graph provided below)
Kelby Robinson Lab Partner: Ashlyn Sneed November 18, 2020 3105-342 Zhang
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