Homework Answers
TLC is not good choice to determine whether cis or trans. Both molecules are polar in nature due to carboxylic acid. Both molecules will move on TLC plate with relevant speed (eventhough cis is more polar than trans). We can not distinguish using TLC plate.
These two can easily determined by NMR and IR spectroscopy methods.
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12. You are given a sample that is believed to be either cis-or trans cinnamic acid....
12. You are given a sample that is believed to be either cis- or trans-cinnamic acid....
12. You are given a sample that is believed to be either cis-
or trans-cinnamic acid. Would TLC be a good method to determine
which compound you have? Why or why not? See structures
arom COOH (A) trans-cinnamic acid (B) cis-cinnamic acid
Starting with either cis-or trans-HO2C-CH=CH-CO2H (i.e., either maleic or fumaric acid) and drawing the other needed...
Starting with either cis-or trans-HO2C-CH=CH-CO2H (i.e., either maleic or fumaric acid) and drawing the other needed compound, provide a syntheses of each of the following: Correct + (c) сон сон Start with maleic acid Draw the other compound necessary for the synthesis. Edit Drawing What major organic product would you expect to obtain when acetic anhydride reacts with each of the following? Note: All structures should be drawn with no bonds to hydrogen atoms. (a) NH3 (excess) Ionic product (draw...
You attempt to perform a bromination of trans-cinnamic acid in the hopes of producing the product...
You attempt to perform a bromination of trans-cinnamic
acid in the hopes of producing the product shown below. You decide
to take a 1H NMR spectrum of what you hope is the
product. Signals with which of the following approximate chemical
shifts would indicate that the product did not
form?
The listed regions would not be useful in determing reaction
success.
~ 12.0 ppm
~ 5.5 ppm
~7.0 ppm
Br O OH Br
can you pleas help me making a Flow chart for separation a mixture of trans-cinnamic acid,...
can you pleas help me making a Flow chart for separation a
mixture of trans-cinnamic acid,
4-phenylphenol, and nicotinamide by extraction?
thank you
Procedure Your mission is to separate a mixture of trans-cinnamic acid, 4-phenylphenol, and nicotinamide by extraction. Start by dissolving/suspending two grams of the mixture in approximately 50 mL of diethyl ether. (Caution: Diethyl ether is extremely flammable! Extract the ether twice with -25 mL of 5% HCl and then twice with -25 mL 5% sodium bicarbonate. It...
You are monitoring the decay of 13-cis-retinal to all-trans-retinal. Initially, your sample contains 100% 13-cis-retinal. After...
You are monitoring the decay of 13-cis-retinal to all-trans-retinal. Initially, your sample contains 100% 13-cis-retinal. After 5 minutes, you see that 55% of your sample has converted to all-trans-retinal. Assume that the all-trans-retinal cannot convert back to 13-cis-retinal. a. What is the rate constant that describes the transformation of 13-cis-retinal to all-transretinal? b. How long will it take for 95% of the sample to be converted to all-trans-retinal?
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part...
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few...
QUESTION 19 For which one of the structures A, B, C or D given below will...
QUESTION 19 For which one of the structures A, B, C or D given below will there be no preferred conformer? Hint: It is highly recommend that you draw out both conformers when attempting this question but if you think carefully, you may rule out two structures right away... Br Bry CI СІ structure B structure C structure D structure A 1. structure A 2. structure 3. Structure D 4. Structure B QUESTION 20 1 points The structure given below...
1. a) Why does biphenyl have a higher Rf value than either benzophenone or triphenylmethanol? Exp...
1. a) Why does biphenyl have a higher Rf value than either benzophenone or triphenylmethanol? Explain based on the structures and their effect on mobility in the TLC process. b) Which compound, benzophenone or triphenylmethanol has a higher Rf value? Explain, based on their structures, how you can predict this. c) You developed your TLC using a 10% mixture of diethyl ether in petroleum ether. Petroleum ether is a mixture of non-polar alkanes, so this TLC solvent is composed of...
for question 19 can you explain why you picked the reagents you did? Sterist CH; HC CHH; CCH; - CC CH trans vinylic...
for question 19 can you explain why you picked the reagents you
did?
Sterist CH; HC CHH; CCH; - CC CH trans vinylic anion more stable anion able cis vinylic a less stab electron repulsion cis radical anion less stable Hical anion is more stable than the cis radical anion, because the nonbonded electrons are farther apart i The trans vinylic anion is more stable than the cis vinylic anion, because the relatively bulky alkyl group in the trans isomer...
What would you expect the observed boiling point to be at 10 torrs of a liquid...
What would you expect the observed boiling point to be at 10 torrs of a liquid which has a boiling point of 300 °C at 760 torrs? (Use Figure) Would it be possible to establish the composition of an unknown binary mixture of two substances from mixture melting-point data? Explain. After recording the R values using as a solvent system ethyl acetate and hexane (1:4), determine what solvent system is needed to obtain values between 0.3-0.4 for each of the...
12. You are given a sample that is believed to be either cis-
or trans-cinnamic acid. Would TLC be a good method to determine
which compound you have? Why or why not? See structures
arom COOH (A) trans-cinnamic acid (B) cis-cinnamic acid
Starting with either cis-or trans-HO2C-CH=CH-CO2H (i.e., either maleic or fumaric acid) and drawing the other needed compound, provide a syntheses of each of the following: Correct + (c) сон сон Start with maleic acid Draw the other compound necessary for the synthesis. Edit Drawing What major organic product would you expect to obtain when acetic anhydride reacts with each of the following? Note: All structures should be drawn with no bonds to hydrogen atoms. (a) NH3 (excess) Ionic product (draw...
You attempt to perform a bromination of trans-cinnamic
acid in the hopes of producing the product shown below. You decide
to take a 1H NMR spectrum of what you hope is the
product. Signals with which of the following approximate chemical
shifts would indicate that the product did not
form?
The listed regions would not be useful in determing reaction
success.
~ 12.0 ppm
~ 5.5 ppm
~7.0 ppm
Br O OH Br
can you pleas help me making a Flow chart for separation a
mixture of trans-cinnamic acid,
4-phenylphenol, and nicotinamide by extraction?
thank you
Procedure Your mission is to separate a mixture of trans-cinnamic acid, 4-phenylphenol, and nicotinamide by extraction. Start by dissolving/suspending two grams of the mixture in approximately 50 mL of diethyl ether. (Caution: Diethyl ether is extremely flammable! Extract the ether twice with -25 mL of 5% HCl and then twice with -25 mL 5% sodium bicarbonate. It...
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few...
QUESTION 19 For which one of the structures A, B, C or D given below will there be no preferred conformer? Hint: It is highly recommend that you draw out both conformers when attempting this question but if you think carefully, you may rule out two structures right away... Br Bry CI СІ structure B structure C structure D structure A 1. structure A 2. structure 3. Structure D 4. Structure B QUESTION 20 1 points The structure given below...
for question 19 can you explain why you picked the reagents you
did?
Sterist CH; HC CHH; CCH; - CC CH trans vinylic anion more stable anion able cis vinylic a less stab electron repulsion cis radical anion less stable Hical anion is more stable than the cis radical anion, because the nonbonded electrons are farther apart i The trans vinylic anion is more stable than the cis vinylic anion, because the relatively bulky alkyl group in the trans isomer...
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