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Why do you think it would not be a good idea to add all of the bromobenzene at once prior to initiating the reaction with the magnesium metal?

Why do you think it would not be a good idea to add all of the bromobenzene at once prior to initiating the reaction with the magnesium metal?

Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter33: Automated Methods Of Analysis
Section: Chapter Questions
Problem 33.5QAP: Give the advantages and disadvantages of sequential injection analyzers compared to traditional flow...
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SYNTHETIC PROCEDURE PERFORM THIS REACTION IN THE HOOD In a mortar and pestle, grind 375 mg (approximate amount) of magnesium metal to provide a fresh surface. Place the magnesium in a dry 25 mL round bottom flask equipped with a Claisen adapter and condenser with a calcium chloride drying tube. Add 5 mL of anhydrous diethyl ether. In a separate vial, measure out 2.5 g of bromobenzene. Take a drop or two of the bromobenzene and add it below the ether close to the magnesium metal. This is so you have a high concentration of the halide at the surface of the metal. Warm the flask gently with a warm water bath. If you do not see any evidence of reaction (bubbling or the formation of turbidity) after about 5 minutes, you will need to use other means to initiate the reaction. Add a very small crystal of iodine to the reaction. Iodine reacts readily with magnesium and will serve to produce a "clean" surface on the metal. If this does not work, consult with your TA for other suggestions. Once the reaction has initiated, dissolve the remaining bromobenzene in about 5 mL of ether and add it in a drop wise fashion to the reaction at a rate that will maintain the reflux. Once the addition is complete, warm the reaction to reflux and continue for 20-30 minutes. Why do you think it would not be a good idea to add all of the bromobenzene at once prior to initiating the reaction with the magnesium metal?
Transcribed Image Text:SYNTHETIC PROCEDURE PERFORM THIS REACTION IN THE HOOD In a mortar and pestle, grind 375 mg (approximate amount) of magnesium metal to provide a fresh surface. Place the magnesium in a dry 25 mL round bottom flask equipped with a Claisen adapter and condenser with a calcium chloride drying tube. Add 5 mL of anhydrous diethyl ether. In a separate vial, measure out 2.5 g of bromobenzene. Take a drop or two of the bromobenzene and add it below the ether close to the magnesium metal. This is so you have a high concentration of the halide at the surface of the metal. Warm the flask gently with a warm water bath. If you do not see any evidence of reaction (bubbling or the formation of turbidity) after about 5 minutes, you will need to use other means to initiate the reaction. Add a very small crystal of iodine to the reaction. Iodine reacts readily with magnesium and will serve to produce a "clean" surface on the metal. If this does not work, consult with your TA for other suggestions. Once the reaction has initiated, dissolve the remaining bromobenzene in about 5 mL of ether and add it in a drop wise fashion to the reaction at a rate that will maintain the reflux. Once the addition is complete, warm the reaction to reflux and continue for 20-30 minutes. Why do you think it would not be a good idea to add all of the bromobenzene at once prior to initiating the reaction with the magnesium metal?
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