After performing dehydrobromination of meso-stilbene dibromide,
why did we have to heat the reaction to such an extreme
temperature? And what is the slow step in this reaction - first or
second? Why?
Homework Answers
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After performing dehydrobromination of meso-stilbene dibromide,
why did we have to heat the reaction to such...
3) Critical analysis (3 points) (a) Why did you have to heat this reaction to such an extreme temperature? Use the...
3) Critical analysis (3 points) (a) Why did you have to heat this reaction to such an extreme temperature? Use the mechanism you drew as a hint (b) Which is the slow step - the first, or second? In this experiment, you will react the product you made in last week's experiment (meso-stilbene dibromide) with strong base in an elimination experiment. This reaction with yield an alkyne, diphenylacetylene. The strong base you will use is potassium hydroxide. The second step...
Draw the mechanisms of each reaction and specify which rxn they under. please and thank you!!...
Draw the mechanisms of each reaction and specify which
rxn they under. please and thank you!!
Н C=C / н trans-addition of H--Br Br Н- - Br H Br (1R,2S)-meso-Stilbene dibromide mp 236-237°C, MW 340.07 Pyridinium hydro- bromide perbromide MW 319.86 E-Stilbene MW 180.24 - Br Н- HOCH,CH,OCH,CH,OCH,CH,OH Triethylene glycol bp 290°C + 2 КОН Br Н- MW 56.00 (IR,2S)-meso-Stilbene dibromide MW 340.07 Diphenylacetylene mp 61°C, MW 178.22 tha oxidation of
lab G: (e)- stilbene, pyridinium tribromide, meso-stilbene dibromide, potassium hydroxide, triethylene glycol, diphenylacetylene, ethanol Mole Table...
lab G: (e)- stilbene, pyridinium tribromide, meso-stilbene
dibromide, potassium hydroxide, triethylene glycol,
diphenylacetylene, ethanol
Mole Table Drawn immediately beneath the Overall Reaction, the Mole Table is used to calcu late the theoretical yield of your product using stoich iometry. All calculations are to be shown in the "Calculations" section. Each column refers to the structure drawn above it. Please cite the source of Mole Table information stated in the Mole Table - refer to the example below for format. As...
numbers 3-5 please Those are the three equations given to us and that is the reaction...
numbers 3-5 please
Those are the three equations given to us and that is the reaction
mechanism as well as the procedure. there is nothing else i can
give you
EXPERIMENT 9: SYNTHESIS OF DIPHENYLACETYLENE Objective: Complete the two-step halogenation/elimination reaction sequence that converts an alkene (trans- stilbene) to an alkyne (diphenylacetylene) 3. Why is it important that the reaction is performed in the presence of a strong base? 4. If the starting mass is 350 mg of stilbene dibromide,...
1st picture is the questions and the next two pictures are the experiment the questions are...
1st picture is the questions and the next two pictures are the
experiment the questions are based off of
Prelab Questions 1) Based on the Material Safety Data Sheets (MSDS) for the compounds, which of the compounds in this experiment is the most hazardous, and why? 2) Fill in the reagent table below. Make sure you correctly calculate the molar amounts of your materials. Name Formula Mol.-eq. Mw mmol Density/Conc. Amount 10 400 mg Meso-Stilbene Dibromide Potassium Hydroxide 5.75 Triethylene...
Pre-Lab Assignment 1) Draw the reaction mechanism for the reaction. 2) Determine the limiting reagent. Procedure...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
please answer all parts I am trying to check my answers. Recrystallization of Acetanilide Recrystallization is...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium bromide, a Grignard reagent, and react it with benzophenone to give triphenylmethanol. Grignard reagents are very reactive and must be synthesized in an environment free of water or any other source of potential proton donor. Once made, the Grignard reagent will do a nucleophilic attack on the carbonyl carbon of the ketone, benzophenone. The result is an alkoxide that is then protonated to give...
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....
please help with how the flow chart will look like? thank you! Synthesis of n-Butyl Bromide...
please help with how the flow chart will look like? thank
you!
Synthesis of n-Butyl Bromide Purpose of the Experiment: In this week's experiment you will be synthesizing n-butylbromide (IUPAC 1-bromobutane from 1-butanol and a concentrated acid via a nucleophilie substitution reaction. It is important to know that alcohols dehydrate to form alkenes in the presence of strong inorganic acids, so care must be taken in this experiment not to heat the reaction too vigorously else an elimination reaction may...
3) Critical analysis (3 points) (a) Why did you have to heat this reaction to such an extreme temperature? Use the mechanism you drew as a hint (b) Which is the slow step - the first, or second? In this experiment, you will react the product you made in last week's experiment (meso-stilbene dibromide) with strong base in an elimination experiment. This reaction with yield an alkyne, diphenylacetylene. The strong base you will use is potassium hydroxide. The second step...
Draw the mechanisms of each reaction and specify which
rxn they under. please and thank you!!
Н C=C / н trans-addition of H--Br Br Н- - Br H Br (1R,2S)-meso-Stilbene dibromide mp 236-237°C, MW 340.07 Pyridinium hydro- bromide perbromide MW 319.86 E-Stilbene MW 180.24 - Br Н- HOCH,CH,OCH,CH,OCH,CH,OH Triethylene glycol bp 290°C + 2 КОН Br Н- MW 56.00 (IR,2S)-meso-Stilbene dibromide MW 340.07 Diphenylacetylene mp 61°C, MW 178.22 tha oxidation of
lab G: (e)- stilbene, pyridinium tribromide, meso-stilbene
dibromide, potassium hydroxide, triethylene glycol,
diphenylacetylene, ethanol
Mole Table Drawn immediately beneath the Overall Reaction, the Mole Table is used to calcu late the theoretical yield of your product using stoich iometry. All calculations are to be shown in the "Calculations" section. Each column refers to the structure drawn above it. Please cite the source of Mole Table information stated in the Mole Table - refer to the example below for format. As...
numbers 3-5 please
Those are the three equations given to us and that is the reaction
mechanism as well as the procedure. there is nothing else i can
give you
EXPERIMENT 9: SYNTHESIS OF DIPHENYLACETYLENE Objective: Complete the two-step halogenation/elimination reaction sequence that converts an alkene (trans- stilbene) to an alkyne (diphenylacetylene) 3. Why is it important that the reaction is performed in the presence of a strong base? 4. If the starting mass is 350 mg of stilbene dibromide,...
1st picture is the questions and the next two pictures are the
experiment the questions are based off of
Prelab Questions 1) Based on the Material Safety Data Sheets (MSDS) for the compounds, which of the compounds in this experiment is the most hazardous, and why? 2) Fill in the reagent table below. Make sure you correctly calculate the molar amounts of your materials. Name Formula Mol.-eq. Mw mmol Density/Conc. Amount 10 400 mg Meso-Stilbene Dibromide Potassium Hydroxide 5.75 Triethylene...
Pre-Lab Assignment
1) Draw the reaction mechanism for the reaction.
2) Determine the limiting reagent.
Procedure 1 Place approximately 1 g of stilbene dibromide prepared in last week's experiment in a 50 mL round bottom flask. Record the exact mass. Add 0.8 g of KOH and 4 mL of triethylene glycol from the syringe provided in the fume hood (rinse any crystals from the sides of the flask while adding triethylene glycol). 2 Heat the stirred reaction mixture to a...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
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....
please help with how the flow chart will look like? thank
you!
Synthesis of n-Butyl Bromide Purpose of the Experiment: In this week's experiment you will be synthesizing n-butylbromide (IUPAC 1-bromobutane from 1-butanol and a concentrated acid via a nucleophilie substitution reaction. It is important to know that alcohols dehydrate to form alkenes in the presence of strong inorganic acids, so care must be taken in this experiment not to heat the reaction too vigorously else an elimination reaction may...
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