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cussion. 1) Acid/Base extraction. Explain step by step, how it was possible to separate eugenol and eugenol acetate during the extraction procedure. 2) Discussion of TLC results

          cussion.
1) Acid/Base extraction. Explain step by step, how it was possible to separate eugenol and eugenol acetate during the extraction procedure.
2) Discussion of TLC results

cussion.
1) Acid/Base extraction. Explain step by step, how it was possible to separate eugenol and eugenol acetate during the extraction procedure.
2) Discussion of TLC results

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Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Madhur L

09/07/2023

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Step 1: Eugenol is a weak acid, while eugenol acetate is not acidic. Show more…

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1) Acid/Base extraction. Explain step by step, how it was possible to separate eugenol and eugenol acetate during the extraction procedure. 2) Discussion of TIC results. How

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Cinnamic Acid n-toluidine anisole The acid/base extraction method involves carrying out simple acid/base reactions in order to separate basic and neutral compounds present in the mixture. Acidic organic compounds form salts with Bronsted bases, such as sodium hydroxide, and organic bases form salts with Bronsted acids, such as hydrochloric acid. The ionic salts are soluble in water but are insoluble in many less polar solvents, such as dichloromethane or ether. Neutral compounds do not react with either Bronsted acids or bases. To achieve separation, this strategy is coupled with the liquid/liquid extraction method, in which the solute is transferred from one solvent into another. For this method, two solvents must be immiscible, such as water and dichloromethane. This forms two distinct layers which can be physically separated using separatory funnel. Draw the Flowchart for separations of the mixture of Cinnamic acid (Dichloromethane; HCI and NaOH), p-toluidine, and anisole using these.

Madhur L.

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Eugenol Extraction from Cloves You will be isolating the natural product, eugenol, from cloves. It is possible that there are some esters of eugenol present, such as acetyl eugenol, along with eugenol itself. Steam Distillation of Essential Oils Weigh out 15 grams of cloves and place them in a 250 mL round bottom flask. Add about 125 mL of water. Set up a simple distillation apparatus. Heat the contents using a low flame (acceptable here because you are essentially distilling water) until the water starts to boil. Occasionally this mixture will foam, so boil at a rate that keeps the foam from bumping over. You can transfer out your distillate periodically to a graduated cylinder to keep it separate in case your distillation does bump over (and so you can monitor the amount of liquid that has distilled out). Collect about 80-100 mL total, making sure to periodically add water to the round bottom flask to replace the water distilled (simply remove the flame, lift the thermometer adapter, and pour water through the distillation head). Dissolve Oils into an Organic Solvent (Extraction from Aqueous Layer) Place the distillate in a separatory funnel and extract with three portions (~15 mL each) of dichloromethane (methylene chloride, CH2Cl2). Remember, the bottom layer is the more dense liquid – the organic layer in this case! Shake gently at first since dichloromethane can form emulsions with organic solutes and water. If you get an emulsion, you can draw off the clear part of the dichloromethane (bottom layer) up to the emulsion layer on your first two extractions. On your third extraction, shake the mixture more gently and allow more time for separation (you can gently use a glass stir rod to break up the bubbles in the emulsion). If there are lots of bubbles at the interface, leave that part behind to avoid drawing off any water. Combine all of your dichloromethane extracts and add enough calcium chloride pellets so that it does not clump. Swirl the flask well to allow the drying agent to adsorb the water from the wet dichloromethane. If the calcium chloride is not powdered, you should be able to decant the solution from the drying agent. If you see fine powder, then do a gravity filtration with filter paper. Analyze ‘Crude’ Organic Layer This dried solution contains ALL of the volatile oil components steam distilled from the cloves (eugenol + eugenol esters + other organic molecules), and we will analyze a portion of this collectively as a class. Measure your volume of the dried dichloromethane solution in a graduated cylinder. Place approximately one-fifth into the tared round bottom flask that has been provided for the class. The instructor will rotovap this fraction (crude oils #1) and take an IR spectrum, and this solution can be used for TLC analysis. Separate Eugenol from Other Essential Oils by Extraction with Aqueous Base Take the remaining 4/5 of your dichloromethane solution and add it to your 125 mL separatory funnel. EXTRACT it with three portions (~10 mL each) of 5% aqueous NaOH solution (NOTE: this causes the deprotonated eugenol to move to the aqueous layer!). Set aside the organic layer but do not discard anything until the entire procedure is completed. This fraction has any neutral organic material not extracted into the aqueous base solution. Isolate Eugenol by Neutralizing and Extracting Back into Organic Acidify the aqueous NaOH extracts to a pH ≈ 1 with concentrated HCl (use litmus paper to check the pH by touching the paper with the tip of a pipette or glass rod). EXTRACT the acidified aqueous layer with three portions (~8 mL each) of dichloromethane, being careful again with possible emulsions being formed (NOTE: this will move the neutral eugenol back into the organic layer!). Dry the combined organic layers (eugenol #2) with calcium chloride, as before, and gravity filter into a tared round-bottom flask. Use a rotovap to remove the dichloromethane. Analyze residual oil by IR and calculate a mass percent recovery of eugenol from the cloves. Analyze your different fractions (#1, #2) using TLC (Develop with 90:10 hexane/ethyl acetate eluent).

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Lab 2: Separation of Organic Compounds by Acid-Base Extraction Techniques Data Analysis Observations Product is a white solid. The pH paper turned red when testing the solution. Mass of watch glass: 48.667 g Mass of watch glass and Acetylsalicylic Acid: 49.015 g Melting Point Range: 135-140 Table 1. Isolation of Acetylsalicylic Acid Observations Product is a white solid. The pH paper turned blue when testing the solution. Mass of watch glass: 48.3590 Mass of watch glass and Caffeine: 48.4280 Melting Point Range: 230-240 Table 2. Isolation of Caffeine Observations Product is a white solid Mass of watch glass: 48.7190 Mass of watch glass and Salicylamide: 48.8663 Melting Point Range: 136-145 Table 3. Isolation of Salicylamide Calculation: You need to determine the % yield of your experiment for all three compounds, insert calculations and results here.

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Transcript

00:01 Hello students, in this video i am going to tell you about separation and extraction.

00:03 For that we are basically going to take the mixture of, mixture of, we are taking cinnamic acid, cinnamic acid and then over here we are taking dichloromethane, dichloromethane and then we are taking hcl and naoh, naoh.

00:32 Alright and now we are taking para toluidine and anisole.

00:43 Alright so now we are going to draw the flowchart for it.

00:46 So for that what do we do, we take all these three, that we are taking, cinnamic acid, cinnamic acid and then we take para toluidine, toluidine and then we take nothing but anisole and we are taking this into a separatory funnel and we are mixing all the three.

01:13 So basically mixing this one and this one and this one, we are mixing all these three and then we are doing it basically dissolving the mixture, dissolving mixture in ch2cl2 and extraction, we are going to extract with hcl, with hcl that is aqueous.

01:44 Alright so what do we get over here, over here we get nothing but we basically get first layer and the second layer.

01:54 So for that first we have first aqueous layer, first aqueous layer here and then we have over here first ch2cl2 layer.

02:10 Alright so in the first this layer what do we get, we get nothing but we get over here toluidine, chloride...

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