In step 2 of the reaction sequence HCl is added to the basic reaction mixture after the reflux period. Show a reaction (with full structures) that explains the purpose of the HCl.

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In step 2 of the reaction sequence HCl is added to the basic reaction mixture after the reflux period. Show a reaction (with full structures) that explains the purpose of the HCl. 

Week 2 - Procedure – Step 2-Synthesis of Virstatin
O Add 0.10g of your virstatin ethyl ester (synthesized last week/ characterized today) to a 10 ml round
bottom flask containing a stir bar.
O Add 1.5 ml methanol to the flask, followed by 0.15 ml 10% NaOH (ag). Heat the mixture under reflux for
30 minutes. (Proper sand temperature is???)
Cool the reaction mixture and place it in an ice bath. Add sufficient 3M HCI (ag), a milliter at a time, with
stirring, to the reaction mixture to adjust the pH to strongly acidic to pH paper – red.
O Add 3 ml water to the mixture and leave the reaction mixture in an ice bath for a few more minutes.
O Vacuum filter the resulting solid, washing with water.
Recrystallize the solid from a minimum amount of hot methanol. Cool in ice, scratch if necessary.
O Vacuum filter the resulting crystals and wash them with 2 ml icy cold methanol.
O Store the virstatin sample in your locker. Pass in any remaining virstatin ethyl ester now. You will weigh
the virstatin product, and prepare an NMR sample next week, passing in any remaining virstatin at that
time.
Transcribed Image Text:Week 2 - Procedure – Step 2-Synthesis of Virstatin O Add 0.10g of your virstatin ethyl ester (synthesized last week/ characterized today) to a 10 ml round bottom flask containing a stir bar. O Add 1.5 ml methanol to the flask, followed by 0.15 ml 10% NaOH (ag). Heat the mixture under reflux for 30 minutes. (Proper sand temperature is???) Cool the reaction mixture and place it in an ice bath. Add sufficient 3M HCI (ag), a milliter at a time, with stirring, to the reaction mixture to adjust the pH to strongly acidic to pH paper – red. O Add 3 ml water to the mixture and leave the reaction mixture in an ice bath for a few more minutes. O Vacuum filter the resulting solid, washing with water. Recrystallize the solid from a minimum amount of hot methanol. Cool in ice, scratch if necessary. O Vacuum filter the resulting crystals and wash them with 2 ml icy cold methanol. O Store the virstatin sample in your locker. Pass in any remaining virstatin ethyl ester now. You will weigh the virstatin product, and prepare an NMR sample next week, passing in any remaining virstatin at that time.
Expert Solution
Step 1

Virstatin is an isoquinonline alkaloid system.

It is a drug used for treating cholera.

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