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Please answer the postlab questions
Post-lab questions (Labs 9A-9D) 1. Why is it important to conduct the benzoin condensation in a closed container? 2. Why is the benzoin condensation carried out in a solvent mixture? 3. Using HPLC with a non-polar stationary phase (C18) and isopropanol as mobile phase, predict the elution sequence for the following compounds: benzil, benzoin, and 1,2,3,4- tetraphenylnaphthalene. Rationalize your choice. 4. Why does the proton of the hydroxyl group in benzoin appears at 8=6.1 ppm in DMSO-do while it shows at 8=4.6 ppm in CDC13? 5. In the Aldol reaction, why is important to use dry glassware and absolute ethanol for the reaction? 6. In the Aldol reaction, why does the product precipitate during the reaction? 7. In the Diels-Alder reaction, which compound(s) is (are) produced in-situ? Why is this approach used here? 8. Why is the Diels-Alder reaction carried out in the lab considered highly entropy-driven? 9. Extra credit: Why is the pure 1,2,3,4-tetraphenylnaphthalene white?