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Why does the Hell-Volhardt-Zelinsky reaction only work for acyl halides and not other carboxyl derivatives?
The reactivity sequence of carboxylic acid derivatives (acyl halides, anhydrides, acids, esters, amides) changes with t...
The reactivity sequence of carboxylic acid derivatives (acyl halides, anhydrides, acids, esters, amides) changes with the substituent. Acyl chlorides are most reactive, amides are least reactive. 1) Explain in detail why the reactivity changes in that sequence, 2) Where do carboxylates fit in that sequence and why? How does that impact on the way carboxylic acid reactions need to run? 3) Where do thioesters, RC(-O)SMe and acyl phosphates, RC(-O)OPO2OR fit in that sequence. Explain your decision
The reactivity sequence of...
Nucleophilic Acyl Substitution Nucleophilic Acyl Substitution is a major reaction for acids and acid derivatives. This...
Nucleophilic Acyl Substitution Nucleophilic Acyl Substitution is a major reaction for acids and acid derivatives. This is the reaction that converts one derivative into another. The substitution can occur in basic or acidic condition, depending on a derivative. Nucleophilic Acyl Substitution in Basic Conditions-general mechanism NUCLEOPHILIC ATTACK LOSS OF A LEAVING GROUP Nue Nuc Nuc Note: in cases when the nucleophile is neutral (H20, ROH,RNHzl, the mechanism includes one more step: deprotonation of an already attached Nuc: group by another...
Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction...
Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermediates, formal charges, and any other...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermed iates, formal charges, and...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermediates, formal charges, and any...
the reaction only yields one alkene. what is the one product and why will the other...
the reaction only yields one alkene. what is the one
product and why will the other one not be formed
Н ииниCНз NaOCH2CH CH3CH2OH Bг шин о улшнs
3. Explain why the following reaction does not work (hint: what is the first step of...
3. Explain why the following reaction does not work (hint: what is the first step of a Claisen Condensation?). OH NO PRODUCT FORMED
6) In the synthesis of bromopropane we used NaBr and H2S04. Why the reaction does not...
6) In the synthesis of bromopropane we used NaBr and H2S04. Why the reaction does not work with only NaBr? 7) The following is a reaction you will see in second semester organic chemistry. The molecular weight of methyl benzoate is 136.16 g/mol and the molecular weight of the product is 181.15 g/mol. COCH3 COCH3 HNO3 i H2SO4 NO2 methyl benzoate methyl 3-nitrobenzoate Assume you have excess acid and you start off with 2.4 g of methyl benzoate. What is...
2. Not only does an aromatic ring itself affect the reactivity of an acid derivative (an ester, o...
2. Not only does an aromatic ring itself affect the reactivity of an acid derivative (an ester, on last year's quiz), substituents on the aromatic ring can further modify the reactivity. First, we will consider a phenyl amide with a para-acetyl substituent: CH, (a) What is the n-effect (resonance) of the para-acetyl substituent? How will that affect the reactivity of the other (amide) carbonyl in the molecule below (increase or decrease, compared to the same amide but with no p-...
Questions: 1. If a leaf contains many pigments, why does it look only green? 2. Is...
Questions: 1. If a leaf contains many pigments, why does it look only green? 2. Is there ever a time in nature when we can observe the other pigments? If so, when? And why?
The reactivity sequence of carboxylic acid derivatives (acyl halides, anhydrides, acids, esters, amides) changes with the substituent. Acyl chlorides are most reactive, amides are least reactive. 1) Explain in detail why the reactivity changes in that sequence, 2) Where do carboxylates fit in that sequence and why? How does that impact on the way carboxylic acid reactions need to run? 3) Where do thioesters, RC(-O)SMe and acyl phosphates, RC(-O)OPO2OR fit in that sequence. Explain your decision
The reactivity sequence of...
Nucleophilic Acyl Substitution Nucleophilic Acyl Substitution is a major reaction for acids and acid derivatives. This is the reaction that converts one derivative into another. The substitution can occur in basic or acidic condition, depending on a derivative. Nucleophilic Acyl Substitution in Basic Conditions-general mechanism NUCLEOPHILIC ATTACK LOSS OF A LEAVING GROUP Nue Nuc Nuc Note: in cases when the nucleophile is neutral (H20, ROH,RNHzl, the mechanism includes one more step: deprotonation of an already attached Nuc: group by another...
Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermediates, formal charges, and any other...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermed iates, formal charges, and...
4. Provide a detailed mechanism for each part of the Hell-Volhard-Zelinsky Reaction below. Note that this reaction is covered in our textbook (among many sections) and that the reaction conditions are modified slightly. Be sure to account for this and be as detailed in every step as possible. Do not create reagents that are not made logically in the pathway (no HBr essentially so it's a "neutral" pathway). Include all curved arrows, reaction arrows, reaction intermediates, formal charges, and any...
the reaction only yields one alkene. what is the one
product and why will the other one not be formed
Н ииниCНз NaOCH2CH CH3CH2OH Bг шин о улшнs
3. Explain why the following reaction does not work (hint: what is the first step of a Claisen Condensation?). OH NO PRODUCT FORMED
6) In the synthesis of bromopropane we used NaBr and H2S04. Why the reaction does not work with only NaBr? 7) The following is a reaction you will see in second semester organic chemistry. The molecular weight of methyl benzoate is 136.16 g/mol and the molecular weight of the product is 181.15 g/mol. COCH3 COCH3 HNO3 i H2SO4 NO2 methyl benzoate methyl 3-nitrobenzoate Assume you have excess acid and you start off with 2.4 g of methyl benzoate. What is...
2. Not only does an aromatic ring itself affect the reactivity of an acid derivative (an ester, on last year's quiz), substituents on the aromatic ring can further modify the reactivity. First, we will consider a phenyl amide with a para-acetyl substituent: CH, (a) What is the n-effect (resonance) of the para-acetyl substituent? How will that affect the reactivity of the other (amide) carbonyl in the molecule below (increase or decrease, compared to the same amide but with no p-...
Questions: 1. If a leaf contains many pigments, why does it look only green? 2. Is there ever a time in nature when we can observe the other pigments? If so, when? And why?
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