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7. Explain with the use of appropriate resonance structures, the regioselectivity of the electrophilic aromatic substitution...
5. What is the function of the charcoal in the purification of the 4-nitroaniline? (3 marks)...
5. What is the function of the charcoal in the purification of the 4-nitroaniline? (3 marks) 6. Why it is not possible to obtain 2- and 4-nitroaniline by direct nitration of aniline? (3 marks) 7. Explain with the use of appropriate resonance structures, the regioselectivity of the electrophilic aromatic substitution reaction - i.e. why is electrophilic aromatic substitution of acetanilide less favoured at the 3-position than at the 2- or the 4-positions. (6 marks) 8. Predict how a 'H NMR...
Aromatic heterocycles also undergo electrophilic aromatic substitution reactions. When furan is treated with an electrophile, the...
Aromatic heterocycles also undergo electrophilic aromatic
substitution reactions. When furan is treated with an electrophile,
the electrophile is installed only at the C-2 position. Explain why
this reaction occurs only at the C-2 position, rather than the C-3
positions.(explain in words and resonance structures)
Question 2 (10 pts). Aromatic heterocycles can undergo EAS reactions. When furan (below) is treated with an electrophile, an EAS reaction occurs in which the electrophile is installed only at carbon 2, not carbon 3. Explain...
You’re developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you’ve performed a bromination...
You’re developing a regiospecific electrophilic aromatic
substitution catalyst. To determine the regioselectivity, you’ve
performed a bromination reaction on phenol. According to the
1H-NMR, what is the product?
1. You're developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you've performed a bromination reaction on phenol. According to the 1H-NMR, what is the product? (5 pts) OH Bro (1 eq) Electrophilic Catalyst 'H NMR Spectrum (200 MHZ, CDCI, solution) expansion exchanges with D20 10 9 8 7 6 5...
consider the resonance structures of acetanilide and methylbenzoate provided above... Several resonance structures of acetanilide are...
consider the resonance structures of acetanilide and
methylbenzoate provided above...
Several resonance structures of acetanilide are shown below: gh Resonance structures involving the amide group Resonance structures involving the aromatic n-electrons QY Resonance structures involving the aromatic T-electrons The actual electron distribution in the acetanilide molecule can be estimated considering all these resonance forms, as shown below using partial negative charges. Therefore, the nitrogen atom at the amide substituent is classified as an ortho-para-directing group. Resonance structures of methyl-benzoate and...
Nitration of phenols is a classic example of an electrophilic aromatic substitution reaction. a) Why does...
Nitration of phenols is a classic example of an electrophilic aromatic substitution reaction. a) Why does the nitration of phenol (hydroxybenzene) proceed only in the ortho- and para-positions on the ring? b) Draw the resonance structures that highlight the ortho- and para-directing nature of hydroxy substituents. Make sure to include the structures that showcase the movement of the charges in the ring.
1. You're developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you've performed a...
1. You're developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you've performed a bromination reaction on phenol. According to the 1H-NMR, what is the product? (5 pts) -OH Br2 (1 eq) ? Electrophilic Catalyst "H NMR Spectrum 200 MHz, CDCI, solution) expansion exchanges with D20 10 9 8 7 6 5 4 3 2 1 0 8 (ppm) 2. What is the final product for the following reactions? (5 pts) 1)Br2, FeBrz, 2HSUNO
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products...
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products are formed when a strong electrophile is added to benzene?) Model 1: (review) Electrophilic Addition of HCI Rani o g cyclohexene carbocation intermediate Run 2 U X benzene This product carbocation intermediate DOES NOT Critical Thinking Questions 1 For Rxn I (above) draw curved arrows showing the mechanism of electrophilic addition of HCl. Include an appropriate carbocation intermediate in the box above. Figure 1:...
Question 3. [time 4 + 8 = 12 minutes) (a) i. Both the regioselectivity and the...
Question 3. [time 4 + 8 = 12 minutes) (a) i. Both the regioselectivity and the rate of an electrophilic aromatic substitution are affected by the substituents already attached to the benzene ring. Some groups promote substitution at the ortho or para positions, while other groups increase substitution at the meta position. Explain the terms "resonance effect" and "inductive effect" of substituents (use words and schemes). ii. Explain, using words and schemes, how in electrophilic aromatic substitutions existing substituents direct...
When naphthalene undergoes an irreversible electrophilic aromatic substitution, the major product is the kinetic product, which...
When naphthalene undergoes an irreversible electrophilic aromatic substitution, the major product is the kinetic product, which proceeds through the most stable arenium ion intermediate. With this in mind, draw the curved arrow mechanism for the first step of the electrophilic aromatic substitution of naphthalene with l^+ generated from l_2 and CuCl_2. If you predicted the correct regiochemistry in the first step, then you can draw the curved arrows and a resonance structure in step 2 with an unbroken benzenoid ring....
Consider the resonance structures of acetanilide and methyl benzoate provided above. How does the -COOCH3 substituent on...
Consider the resonance structures of acetanilide and methyl
benzoate provided above.
How does the -COOCH3 substituent on methyl benzoate direct?
Do the partial charges shown on either acetanilide or
methyl-benzoate activate or deactivate the electrophilic
substitution reaction?
Is there a correlation between directing and activating groups?
Explain.
I
Resonance structures of methyl-benzoate and the resulting partial charges are shown below. How does the benzoate group direct? 0: -1 =O :00 00 OA Several resonance structures of acetanilide are shown below:...
5. What is the function of the charcoal in the purification of the 4-nitroaniline? (3 marks) 6. Why it is not possible to obtain 2- and 4-nitroaniline by direct nitration of aniline? (3 marks) 7. Explain with the use of appropriate resonance structures, the regioselectivity of the electrophilic aromatic substitution reaction - i.e. why is electrophilic aromatic substitution of acetanilide less favoured at the 3-position than at the 2- or the 4-positions. (6 marks) 8. Predict how a 'H NMR...
Aromatic heterocycles also undergo electrophilic aromatic
substitution reactions. When furan is treated with an electrophile,
the electrophile is installed only at the C-2 position. Explain why
this reaction occurs only at the C-2 position, rather than the C-3
positions.(explain in words and resonance structures)
Question 2 (10 pts). Aromatic heterocycles can undergo EAS reactions. When furan (below) is treated with an electrophile, an EAS reaction occurs in which the electrophile is installed only at carbon 2, not carbon 3. Explain...
You’re developing a regiospecific electrophilic aromatic
substitution catalyst. To determine the regioselectivity, you’ve
performed a bromination reaction on phenol. According to the
1H-NMR, what is the product?
1. You're developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you've performed a bromination reaction on phenol. According to the 1H-NMR, what is the product? (5 pts) OH Bro (1 eq) Electrophilic Catalyst 'H NMR Spectrum (200 MHZ, CDCI, solution) expansion exchanges with D20 10 9 8 7 6 5...
consider the resonance structures of acetanilide and
methylbenzoate provided above...
Several resonance structures of acetanilide are shown below: gh Resonance structures involving the amide group Resonance structures involving the aromatic n-electrons QY Resonance structures involving the aromatic T-electrons The actual electron distribution in the acetanilide molecule can be estimated considering all these resonance forms, as shown below using partial negative charges. Therefore, the nitrogen atom at the amide substituent is classified as an ortho-para-directing group. Resonance structures of methyl-benzoate and...
1. You're developing a regiospecific electrophilic aromatic substitution catalyst. To determine the regioselectivity, you've performed a bromination reaction on phenol. According to the 1H-NMR, what is the product? (5 pts) -OH Br2 (1 eq) ? Electrophilic Catalyst "H NMR Spectrum 200 MHz, CDCI, solution) expansion exchanges with D20 10 9 8 7 6 5 4 3 2 1 0 8 (ppm) 2. What is the final product for the following reactions? (5 pts) 1)Br2, FeBrz, 2HSUNO
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products are formed when a strong electrophile is added to benzene?) Model 1: (review) Electrophilic Addition of HCI Rani o g cyclohexene carbocation intermediate Run 2 U X benzene This product carbocation intermediate DOES NOT Critical Thinking Questions 1 For Rxn I (above) draw curved arrows showing the mechanism of electrophilic addition of HCl. Include an appropriate carbocation intermediate in the box above. Figure 1:...
Question 3. [time 4 + 8 = 12 minutes) (a) i. Both the regioselectivity and the rate of an electrophilic aromatic substitution are affected by the substituents already attached to the benzene ring. Some groups promote substitution at the ortho or para positions, while other groups increase substitution at the meta position. Explain the terms "resonance effect" and "inductive effect" of substituents (use words and schemes). ii. Explain, using words and schemes, how in electrophilic aromatic substitutions existing substituents direct...
When naphthalene undergoes an irreversible electrophilic aromatic substitution, the major product is the kinetic product, which proceeds through the most stable arenium ion intermediate. With this in mind, draw the curved arrow mechanism for the first step of the electrophilic aromatic substitution of naphthalene with l^+ generated from l_2 and CuCl_2. If you predicted the correct regiochemistry in the first step, then you can draw the curved arrows and a resonance structure in step 2 with an unbroken benzenoid ring....
Consider the resonance structures of acetanilide and methyl
benzoate provided above.
How does the -COOCH3 substituent on methyl benzoate direct?
Do the partial charges shown on either acetanilide or
methyl-benzoate activate or deactivate the electrophilic
substitution reaction?
Is there a correlation between directing and activating groups?
Explain.
I
Resonance structures of methyl-benzoate and the resulting partial charges are shown below. How does the benzoate group direct? 0: -1 =O :00 00 OA Several resonance structures of acetanilide are shown below:...
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