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29 Nov 2019

When Kurt Alder examined the reactions of a mixture of dienes 1and 2 with maleic

anhydride, he discovered that diene 1 reacted at 35

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calculate the amount of the major component in the eucalyptus oil and the amount of maleic anhydride you will need to use in the diels alder reaction.

JBE/KWK CHEM 222 Safety Issues Caution! Avoid contact with and do not breathe the dust of the maleic anhydride! use these reagents in a hood or under a fume extractor Procedure Spring 2018 away from flames and Analysis of Eucalyptus Oil by GC-MS-A sample 1 Î¼ãof the eucalyptus oil was injected into the GC- MS. Use the gas chromatograph and peak integration data provided on BlackBoard to calculate the percentage of all peaks produced from the eucalyptus oil. The sharp peak with a very low retention time is most likely acetone and not a component of the oil, and therefore was not integrated. Record the peak areas in your lab notebook and show your calculation for percent of the major component (largest peak area) in the oil Diels-Alder Reaction- Calculate the mass of the unknown CioHthe diene in 0.50 g eucalyptus oil ng the GC data (the percent composition of the largest peak of the eucalyptus oil) assuming that the peak areas are proportional to the component masses. The mass you calculate shoulc be entered into the synthesis data chart in your laboratory notebook. The diene and dienophile (maleic anhydride) are added to the reaction in equal molar quantities Calculate the moles of diene present in the 0.50 g eucalyptus oil and calculate the mass of maleic anhydride that you will add to the reaction All glassware must be clean and dry throughout the procedure as the maleic anhydride the Diels-Alder adduct are readily hydrolyzed by water and In a clean, dry microwave reaction vessel equipped with a stir bar dissolve 0.5 g eucalyptus oil in 5 mL THF and add the calculated mass of maleic anhydride. Cap the reaction vessel tightly and put into the microwave carrousel and record which slot your vessel is in. After the completion of the reaction using the microwave reactor let the vessel cool to room temperature. The actua measured mass of maleic anhydride should be entered into the synthesis data chart in your laboratory notebook. While your reaction is being heated, calculate the actual mass of the diene in your reaction based on the measured mass of oil in your flask and enter this value in the synthesis data chart and calculate the limiting reactant in your reaction If no crystals have formed by the time it is cooled to room temperature, create a nucleation site dipping a stirring rod into the solution, withdrawing it, allowing the ether to evaporate, then swirl the stirring rod in the solution. When the crystal formation appears to be complete, cool the flask in an ice water bath for an additional 5 minutes. Collect the product by vacuum filtration washing the crystals with 5 mL cold petroleum ether (place your flask with the petroleum ether in the ice water bath to cool while your crystals are forming) Recrystallize the Diels-Alder adduct from methanol in a small lask using a steam bath for a heat source. Just as the product can undergo hydrolysis with water, it can go through solvolysis with methanol. Avoid boiling the solution for extended periods of time. Once the product has been recrystallized and collected by vacuum filtration, transfer the crystals to a pre-weighed watch

Please help me figure out my results and percent yield the starting weight in grams is 0.452 and ending in 0.408

ID of a Conjugated Diene Safety Precautions: Maleic anhydrid e is corrosive and toxic and can cause severe damage to the eyes, skin, and upper respiratory tract. Wear gloves, avoid contact with skin, eyes, or clothing, and do not breathe the dust. If you must pulverize maleic anhydride briquettes, do it under the hood and wear protective elothing.Ehyl ether and petroleum ether are extremely flammable and maybed harmful if inhaled. through the skin. Methanol is harmful if inhaled, swallowed, or absorbed maleic anhydride The actual structure of the adduct depends on the structure of the unknown diene Conventional Heating Procedure: Dissolve 0.85 mL of the eucalyptus oil in 2 mL (calibrated Pasteur pipet) of anhydrous maleic diethyl ether in a pear-shaped flask containing a magnetic spin vane, and add 450 mg of anhydride. Gently reflux the mixture on a sand bath (40-50Â°C, see NOTE) for 45 minutes. While it is still warm, transfer the reaction mixture to a small beaker, cover the beaker with a watch glass, and let it cool slowly to room temperature. Cool it further in an ice bath to allow complete crystallization. Collect the adduct by vacuum filtration, washing the crystals on the filter with 2 mL of cold, low-boiling petroleum ether. After air drying the adduct on the Hirsch funnel for several minutes, and measure its mass and evacuated melting point. NOTE: To maintain the temperature of the sand bath at 40-50Â°C, turn the power to a low setting until the temperature reaches 45Â°C. Turn the power off and cover the flask and the sand bath with a piece of aluminum foil. It the temperature then falls below 40Â°C, turn the power on again to raise the temperature to 45Â°C, and again turn the power off Report: Give the name and structure of the diene in eucalyptus oil, and justify your conclusion. Show the complete reaction diagram for the reaction including the structures of the diene and the Diels-Alder product. Calculate the theoretical yield of the adduct based on the mass of maleic anhydride you used, and calculate your percentage yield. Page 3 of 4

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When Kurt Alder examined the reactions of a mixture of dienes 1and 2 with maleic

anhydride, he discovered that diene 1 reacted at 35

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When Kurt Alder examined the reactions of a mixture of dienes 1and 2 with maleic anhydride, he discovered that diene 1 reacted at 35

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When Kurt Alder examined the reactions of a mixture of dienes 1and 2 with maleic

anhydride, he discovered that diene 1 reacted at 35