1) Why do we use a mixture of ethyl acetate and hexanes as solvents in the...
1) Why do we use a mixture of ethyl acetate and hexanes as solvents in the synthesis of 5,6-endo-dicarboxylic anhydride?
2) What do the terms exo and endo refer to?
3) Why do we not do any TLC on the product in the synthesis of 5,6-endo-dicarboxylic anhydride?
Homework Answers
Add Answer to:
1) Why do we use a mixture of ethyl acetate and hexanes as
solvents in the...
Draw a structure for the exo product formed by cyclopentadiene and maleic anhydride. Because the exo...
Draw a structure for the exo product formed by cyclopentadiene and maleic anhydride. Because the exo form is more stable than the endo form, why is the endo product formed almost exclusively in this reaction? In addition to the main product, what are two side reactions that could occur in the preparation of cis-Norbornene-5,6-endo-dicarboxylic anhydride from cyclopentadiene and maleic acid in the presence of ethyl acetate and ligroin?
How would I calculate the theoretical yield of endo-cis-norbornene-5,6-endo-dicarboxylic anhydride and endo-cis-norbornene-5,6-dicarboxylic acid? Can you please...
How would I calculate the theoretical yield of
endo-cis-norbornene-5,6-endo-dicarboxylic anhydride and
endo-cis-norbornene-5,6-dicarboxylic acid? Can you please show me
step by step? Can you show me the balanced chemical equation (with
molecular formulas, not the pictures) with the mole ratios as well?
How do we figure out the limiting reagent? Can you also show how to
convert mL to grams for cyclopentadiene, if needed?
We used:
2g of maleic acid
6mL of ethyl acetate
6mL of ligroin (hexanes)
2mL of cyclopentadiene...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed...
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed on a mixture of two compounds. The solvent ran for 3 cm(plate length is 6cm) with 5% ethyl acetate in hexane. The two spots were not resolved, meaning they showed up too close to each other. What can you suggest to possible improve the results of the separation?
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the...
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the elution solvents (hexanes or ethyl acetate) would not be visible under UV visualization?
The goal of this experiment is to separate a mixture of two unknown compounds into individual...
The goal of this experiment is to separate a mixture of two unknown compounds into individual Components and to identify the compounds. Answer the questions below. More than one answer may be possible. Why do we need to be especially careful when working with diethyl ether? Fumes can cause drowsiness & dizziness, and in high concentration, loss of consciousness Because it is highly acidic and can burn the skin Because it is extremely volatile and flammable. Of all of the...
What is the advantage of using cyclohexane over hexanes in the TLC? Why do we often...
What is the advantage of using cyclohexane over hexanes in the TLC? Why do we often use hexanes instead? Please answer the cyclohexane part of the question. Thank you.
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you...
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
1. Examine the IR spectrum of cis-norbornene-5,6-endo-dicarboxylic anhydride, (Fig.48.8, pp. 630): what do the signals at...
1.
Examine the IR spectrum of cis-norbornene-5,6-endo-dicarboxylic
anhydride, (Fig.48.8, pp. 630): what do the signals at 1750 cm-1
and 1838 cm-1 indicate?
2. Explain the following questions regarding the possible
contamination of the final isolated product with dicyclopentadiene
(the cyclopentadiene dimer).
a. Since “cracked” cyclopentadiene can spontaneously dimerize
back to dicyclopentadiene, could the dimer be formed as an unwanted
“by-product” during the experiment?
b. How does the experimental procedure minimize contamination of
the final isolated (desired) product with this (undesired)...
can you please answer all 1. When you run a TLC of the reaction in ethyl...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
How would I calculate the theoretical yield of
endo-cis-norbornene-5,6-endo-dicarboxylic anhydride and
endo-cis-norbornene-5,6-dicarboxylic acid? Can you please show me
step by step? Can you show me the balanced chemical equation (with
molecular formulas, not the pictures) with the mole ratios as well?
How do we figure out the limiting reagent? Can you also show how to
convert mL to grams for cyclopentadiene, if needed?
We used:
2g of maleic acid
6mL of ethyl acetate
6mL of ligroin (hexanes)
2mL of cyclopentadiene...
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the elution solvents (hexanes or ethyl acetate) would not be visible under UV visualization?
The goal of this experiment is to separate a mixture of two unknown compounds into individual Components and to identify the compounds. Answer the questions below. More than one answer may be possible. Why do we need to be especially careful when working with diethyl ether? Fumes can cause drowsiness & dizziness, and in high concentration, loss of consciousness Because it is highly acidic and can burn the skin Because it is extremely volatile and flammable. Of all of the...
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
1.
Examine the IR spectrum of cis-norbornene-5,6-endo-dicarboxylic
anhydride, (Fig.48.8, pp. 630): what do the signals at 1750 cm-1
and 1838 cm-1 indicate?
2. Explain the following questions regarding the possible
contamination of the final isolated product with dicyclopentadiene
(the cyclopentadiene dimer).
a. Since “cracked” cyclopentadiene can spontaneously dimerize
back to dicyclopentadiene, could the dimer be formed as an unwanted
“by-product” during the experiment?
b. How does the experimental procedure minimize contamination of
the final isolated (desired) product with this (undesired)...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
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