Grignard Reagent Experiment Q1. Benzene is often a by-product in the synthesis of phenylmagnesium bromide. Explain...
Grignard Reagent Experiment
Q1. Benzene is often a by-product in the synthesis of phenylmagnesium bromide. Explain its formation, including a chemical reaction.
Q2. If a chemist uses ethanol instead of diethyl ether as the reaction solvent, would the Grignard synthesis still proceed as expected?
Q3. What is the structure of the white precipitate that forms when acetophenone is added to a solution of phenylmagnesium bromide?
Q4. An aqueous ammonium chloride solution, rather than sulfuric acid, is used in the hydrolysis of the magnesium complex of 1,1-diphenylethanol to ensure that no acid-catalyzed dehydration occurs. Write the chemical structure of the dehydration product from 1,1-diphenylethanol.
Q5. If acetone were reacted with phenylmagnesium bromide, followed by hydrolysis of the intermediate magnesium complex, what would the organic product be?
Other
• Acid-base proton transfers: Know how this type of reaction is used in extraction to separate organic compounds. How is solubility used to your advantage to make this work? For practice, try drawing a flow chart (similar to the one we drew in lab) showing how to separate and isolate a carboxylic acid, a neutral, and an amine.
Homework Answers
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Grignard Reagent Experiment
Q1. Benzene is often
a by-product in the synthesis of phenylmagnesium bromide. Explain...
Extraction Q1. Why doesn’t the neutral organic compound dissolve in the 1.5 M NaOH solution? Q2....
Extraction Q1. Why doesn’t the neutral organic compound dissolve in the 1.5 M NaOH solution? Q2. Why is diethyl ether a good choice for the organic solvent in this extraction experiment? Q3. What experimental difficulty would you encounter if you neglected to include the drying step before evaporating the ether solution of the neutral organic compound? Q4. Why are the two organic compounds recrystallized before their melting points are determined? Q5. What IR bands are most useful in distinguishing a...
What is the product of the Grignard reaction of phenylmagnesium bromide and acetophenone then H+?
What is the product of the Grignard reaction of phenylmagnesium bromide and acetophenone then H+?
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepa...
i need help with the prelab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
The following GCMS spectrum was of the product of a Grignard reaction between phenylmagnesium bromide and...
The following GCMS spectrum was of the product of a Grignard
reaction between phenylmagnesium bromide and acetophenone in
anhydrous conditions. The major peak in the chromatogram was
1,1-diphenylethanol. I was able to identify that peak and its
fragmentation. However, I cannot figure out the identity of the
second peak in the chromatogram (around 9 minutes). I have attached
this mass spec in the post below, and I appreciate any help in
determining its identity and fragmentation.
le Name: CM 227...
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepa...
i need help with the postlab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
[No Subject] Me to Aisha OsanyinpejuSent The synthesis of 1,1-diphenylethanol via the grignard reaction is given...
[No Subject]
Me to Aisha OsanyinpejuSent
The synthesis of 1,1-diphenylethanol via the grignard
reaction is given by the following equation (below):
A student decides to perform the above reaction. She
starts with 0.32ml of bromobenzene (M.W. = 157) and uses 0.0072g of
Mg (M.W. = 24.3) and 0.23ml of acetophenone (M.W. = 120.15).
a. Calculate the limiting reagent
b. Calculate the theoretical yield of
1,1-diphenyethanol
c. She obtains 0.172 grams of of the product. What is
her actual yield?
d....
1. The synthesis of Grignard reagent is challenging. a) Draw the product that is expected to...
1. The synthesis of Grignard reagent is challenging. a) Draw the product that is expected to be formed if the Grignard reagent was in contact with water prior to the reaction with MgBr CO2? (2 pts) b) Circle the correct answer. In the reaction in 1 a), phenyl magnesium bromide acts as a (nucleophile/electrophile/base/acid). (1 pt) Consider the following reaction and circle the correct answer. In this reaction, phenyl magnesium bromide acts as a, Oo MgBr MgBr (nucleophile/electrophile/base/acid). (1 pt)...
Benzene is often produced as a side product during Grignard reactions using phenylmagnesium bromide. How can...
Benzene is often produced as a side product during Grignard reactions using phenylmagnesium bromide. How can its formation be explained? Give a balanced equation for its formation.
A Grignard reaction was performed using the following steps: Step 1: Addition of Grignard Reagent: Phenyl...
A Grignard reaction was performed using the following steps: Step 1: Addition of Grignard Reagent: Phenyl Magnesium Bromide a solution of phenyl magnesium bromide (2.7 mL of a 3.0 M solution in anhydrous diethyl ether) and 5 mL of anhydrous diethyl ether was dispensed into the round-bottom flask and stirred with a stir bar. Step 2: Addition Formation: Reaction with Benzophenone A solution of 0.72 g (mp = 48-49 degrees C) of benzophenone and 2.0 mL of anhydrous diethyl ether...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis of the reaction mixture with dilute acid. B) Why should anhydrous diethyl ether be used rather than regular solvent grade diethyl ether to prepare the solution of benzaldehyde that is added to the Grignard reagent, 2- methyl propane-1- magnesium bromide? C) By drawing the structure indicate the polarity (charge separation) of the bond between carbon and bromine in 1-bromo-2-methyl propane. Is 1-bromo-2-methyl propane electrophile...
i need help with the prelab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
The following GCMS spectrum was of the product of a Grignard
reaction between phenylmagnesium bromide and acetophenone in
anhydrous conditions. The major peak in the chromatogram was
1,1-diphenylethanol. I was able to identify that peak and its
fragmentation. However, I cannot figure out the identity of the
second peak in the chromatogram (around 9 minutes). I have attached
this mass spec in the post below, and I appreciate any help in
determining its identity and fragmentation.
le Name: CM 227...
i need help with the postlab questions please
Grignard reagent THE GRIGNARD REAGENT-PREPARATION AND REACTION In this experiment, you will prepare a Grignard reagent, phenyl magnesium bromide, from bromobenzene and magnesium metal. The Grignard reagent will then react with methyl benzoate to form triphenylmethanol. Introduction Grignard reagents, such as organomagnesium halides, were discovered in 1910 by French chemist Victor Grignard. The Grignard reaction is one of the most general methods for carbon- carbon bond formation in all of organic chemistry....
[No Subject]
Me to Aisha OsanyinpejuSent
The synthesis of 1,1-diphenylethanol via the grignard
reaction is given by the following equation (below):
A student decides to perform the above reaction. She
starts with 0.32ml of bromobenzene (M.W. = 157) and uses 0.0072g of
Mg (M.W. = 24.3) and 0.23ml of acetophenone (M.W. = 120.15).
a. Calculate the limiting reagent
b. Calculate the theoretical yield of
1,1-diphenyethanol
c. She obtains 0.172 grams of of the product. What is
her actual yield?
d....
1. The synthesis of Grignard reagent is challenging. a) Draw the product that is expected to be formed if the Grignard reagent was in contact with water prior to the reaction with MgBr CO2? (2 pts) b) Circle the correct answer. In the reaction in 1 a), phenyl magnesium bromide acts as a (nucleophile/electrophile/base/acid). (1 pt) Consider the following reaction and circle the correct answer. In this reaction, phenyl magnesium bromide acts as a, Oo MgBr MgBr (nucleophile/electrophile/base/acid). (1 pt)...
1. Write equations for the reaction of 2-methyl propane-1- magnesium bromide with acetaldehyde include the hydrolysis of the reaction mixture with dilute acid. B) Why should anhydrous diethyl ether be used rather than regular solvent grade diethyl ether to prepare the solution of benzaldehyde that is added to the Grignard reagent, 2- methyl propane-1- magnesium bromide? C) By drawing the structure indicate the polarity (charge separation) of the bond between carbon and bromine in 1-bromo-2-methyl propane. Is 1-bromo-2-methyl propane electrophile...
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