|| R-COH + acid dehydration) + || R'-OH = R-CO-R' + H₂O alcohol (a = ester Notice that the R group from the acid ends up

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R Coh Acid Dehydration R Oh R Co R H O Alcohol A Ester Notice That The R Group From The Acid Ends Up 1 (206.05 KiB) Viewed 12 times

|| R-COH + acid dehydration) + || R'-OH = R-CO-R' + H₂O alcohol (a = ester Notice that the R group from the acid ends up closest to the carbonyl (C=O) group. This is a useful fact to memorize as it may not be intuitive. Esters usually have interesting and pleasant odors which you will note and describe. Procedure for Esterification Reactions B1, B2 and B3: For each of the three reactions below, to a dry 20-mL test tube add 10 drops of the formic or glacial acetic acid. Then add 10 drops of the alcohol and 5 drops of concentrated sulfuric acid. Shake vigorously with a whipping action for 10 s. Place the tube in a hot water bath (60- 70°C) for 15 min. You may want to get all three tubes ready, then heat the three together to save time. After 15 min, remove the tubes and cool for 1min. Add 2 mL of reagent water and shake. The ester products are immiscible with water and will appear as a layer separate from the water you added. With the tip of a glass rod, take a drop or two from the ester layer and touch this end of the rod to the center of a piece of labeled filter paper. Take all three filter papers into the hallway and note the odors. Procedure B1: Esterification of formic acid and 2-butanol (isobutyl alcohol). Prelab Question 5: Write the chemical equation for this reaction using structural formulas. Name the ester product. Observation B1: Describe the odor of the ester product. You may wish to go into the hallway to get some fresh air. Procedure B2: Esterification of acetic acid and benzyl alcohol. Prelab Question 6: Write the chemical equation for this reaction using structural formulas. Name the ester product.