Question

SAMPLE PROCEDURES: 1. Isoanvl acetate (banana) + H2O OH HO 1. Mix 6 mL of isoamyl alcohol (0.809 g/mL, 88.148 g/mol) and 10 ml ofglacial acetic acid (1.05 g/ml 60.05 g/mol) in a 100 mL round bottom flask. Carefully add 1 mL oif concentrated sulfuric acid while swirling Add either boiling chips or a stirring bar and assemble the apparatus forreflux. Gently reflux with stirring for 30 minutes (see figure at the end). 2. 3. Allow the flask to then cool at room temperature for about five minutes and then cool in an ice bath Pour the mixture into a separatory funnel and add 10 mL ofcold water (made from ice and distilled water chilled in an ice bath) Shake the layers and allow them to separate Remove and discard the lower, aqueous layer but keep the top organic layer 4. Add another 10 mL portion of cold water to the organic oil, shake the layers andseparate them again. Discard the aqueous layer but keep the top organiclayer 5. Wash the organic layer with 10 mL of saturated sodium bicarbonate (NaHCO3) separate, and then wash once with it with 10 mL of saturated sodium chloride solution 6. Transfer the organic layerto a 125 mL Erlenmeyer flask and dry it for five minutes over magnesium sulfate (MgSO). Filter the dried solution. 7. Determine the weight of your crude product. If so instructed purify the banana oil by simple distillation 8. 9. Calculate the yield, the %yield, and put the sample in a labeled vial to turn in.

Thumbs up for good answer. Why does the liquid in the round bottom flask turn light pink?, please explain (This happened during/after step 2). This is the procedure and the experiment is called Synthesis of Artificial Flavorings by Fischer Esterification.

Thank you!

Answer 1

Reaction scheme: Mechanism: Observation: In the first part of the reaction while refluxing sulphuric acid was added to the acetic acid & isopentyl alcohol solution and the solution turned a brownish pink colour During the efflux the solution for darker as the reaction progressed and began to have a banana smell.