Problem: a) show that the [4 +4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is...
Problem:
a) show that the [4 +4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is thermally forbidden but photochemically allowed.
b) There is a different, thermally allowed cycloaddition of two butadiene molecules. Show this reaction, and explain why it is thermally allowed. (hint: consider the dimerization of cyclopentadiene.)
Homework Answers
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Problem:
a) show that the [4 +4] cycloaddition of two butadiene molecules
to give cycloocta-1,5-diene is...
18, 22, 23 16) What diene and dienophile would react to give the product below? diere...
18, 22, 23
16) What diene and dienophile would react to give the product below? diere 17) Which of the following compounds is the most reactive dienophile in a Diels-Alder reaction with 1,3-butadiene? A) CH-CHOCH B) CH2-CHCHO C) CH3CHCHCH3 D) (CH3CH2 5) C .CH 18) Using resonance structures, explain the regiochemistry observed in this reaction OCH H.CO heat 19) Provide the major organic product of the following reaction H.CO ÇOCH H.COM 20) Provide the major organic product of the following...
Please help!! Questions 1. Why does the trans conformation of a diene, in reaction with a...
Please help!!
Questions 1. Why does the trans conformation of a diene, in reaction with a dienophile, not lead to a Diels-Alder reaction product? 2. Complete the following Diels-Alder reactions. Provide the major endo-product(s). Diene Dienophile Product(s) Domov - 0.0- 3. How many a electrons are there in a molecule of 1.3-butadiene? 106 4. What is the maximum number of electrons that can reside in a molecular orbital? (Hint: It is the same maximum number that can fit into an...
Consider the Diels-Alder cycloaddition reaction below and complete parts (a)-(b) below.
Consider the Diels-Alder cycloaddition reaction below and complete parts (a)-(b) below. D = deuterium = 2H (a) Draw the major regioisomer (or in other words, constitutional isomer) expected to form. Also, draw appropriate resonance structures to explain why only one constitutional isomer is expected to form. Discuss the interactions between the diene and dienophile that govern this constitutional isomer being the only one expected. (b) Redraw the regioisomer from part (a) and show the appropriate stereochemistry using correct dash/wedge notation expected for the...
12. Heading toward cubane synthesis. Cyclobutadiene is difficult to isolate because it readily reacts with itself...
12. Heading toward cubane synthesis. Cyclobutadiene is difficult to isolate because it readily reacts with itself to form a dimer (two molecules coming together to form one bigger molecule) according to the reaction below. (Stereochemistry is not indicated.) cyclobutadiene dimer named as triyclo[4.2.0.02.- Jocta-3,7-diene (a) Describe in detail how the name triyclo[4.2.0.025 Jocta-3,7-diene is derived from the structure. Tell about each part of the name: tri, cyclo, 4, 2, 0, 0,2-5, octa, 3, 7, di, ene (b) This above reaction...
need help 4. Assume that you have samples of the following two molecules, both with the...
need help
4. Assume that you have samples of the following two molecules, both with the formula CsH160. a) Suppose you are given one of the above molecules (but not both). How could you use an oxidation reaction to determine which molecule you have? Briefly explain with text and reasonable sketches. b) Suppose you are given one of the above molecules (but not both). How could you use dehydration reaction to determine which molecule you have? Briefly explain with text...
3. Give the structures of the two products for addition reaction of HCI to 3-methyl-1-pentene (1...
3. Give the structures of the two products for addition reaction of HCI to 3-methyl-1-pentene (1 point), Point out which one is the major product, and explain why! (Hint: dont forget carbocation rearrangement) 4. The transformation of the alkyl chloride shown below into the alcohol can be accomplished in two steps. Show the synthetic scheme to finish the conversion. (1 point) OH
Bonus 3. Give the structures of the two products for addition reaction of HCl to 3-methyl-1-pentene...
Bonus 3. Give the structures of the two products for addition reaction of HCl to 3-methyl-1-pentene (1 point). Point out which one is the major product, and explain why! (Hint: dont forget carbocation rearrangement) 4. The transformation of the alkyl chloride shown below into the alcohol can be accomplished in two steps. Show the synthetic scheme to finish the conversion. (1 point) Он Br
4. (a) A WileyPlus problem from the (now defunct) Ch. 21 assignment I used to give asked about the product formed from the aromatic nitrile below upon reaction with amide. Their product was actua...
4. (a) A WileyPlus problem from the (now defunct) Ch. 21 assignment I used to give asked about the product formed from the aromatic nitrile below upon reaction with amide. Their product was actually quite different than mine... That said, both have plausible mechanisms to support their formation. Propose two different mechanisms to explain the formation of the two different products (don't bother drawing the mechanism of the acidic workup that's Ch. 16). (9 points) WP answer 2 equiv KNH2...
1.) (9 points) Give structures for the following compounds: a) meta-phenylphenol b) 6-benzyl-3-heptanol e) ortho-sec-butyltoluene 2.)...
1.) (9 points) Give structures for the following compounds: a) meta-phenylphenol b) 6-benzyl-3-heptanol e) ortho-sec-butyltoluene 2.) (9 points) Name the following compounds: 3.) (8 points) Label the following molecules as aromatic, anti-aromatic, or non-aromatic. For the ones th aren't aromatic, explain why they are either non-aromatic or anti-aromatic. 0.8 4.) (11 points) For the following electrophilic aromatic substitution reaction: Вт, FeBr; a) Which product is the major one? b) Draw a complete mechanism for the formation of the major product...
2. Goal of this problem is to study how tunnelling in a two-well system emerges. In particular, w...
2. Goal of this problem is to study how tunnelling in a two-well system emerges. In particular, we are interested in determining how the tunnelling rate T' of a particle with mass m scales as a function of the (effective) height Vo - E and width b of an energy barrier separating the two wells. The following graphics illustrates the set-up. Initially the particle may be trapped on the left side corresponding to the state |L〉, we are now interested...
18, 22, 23
16) What diene and dienophile would react to give the product below? diere 17) Which of the following compounds is the most reactive dienophile in a Diels-Alder reaction with 1,3-butadiene? A) CH-CHOCH B) CH2-CHCHO C) CH3CHCHCH3 D) (CH3CH2 5) C .CH 18) Using resonance structures, explain the regiochemistry observed in this reaction OCH H.CO heat 19) Provide the major organic product of the following reaction H.CO ÇOCH H.COM 20) Provide the major organic product of the following...
Please help!!
Questions 1. Why does the trans conformation of a diene, in reaction with a dienophile, not lead to a Diels-Alder reaction product? 2. Complete the following Diels-Alder reactions. Provide the major endo-product(s). Diene Dienophile Product(s) Domov - 0.0- 3. How many a electrons are there in a molecule of 1.3-butadiene? 106 4. What is the maximum number of electrons that can reside in a molecular orbital? (Hint: It is the same maximum number that can fit into an...
12. Heading toward cubane synthesis. Cyclobutadiene is difficult to isolate because it readily reacts with itself to form a dimer (two molecules coming together to form one bigger molecule) according to the reaction below. (Stereochemistry is not indicated.) cyclobutadiene dimer named as triyclo[4.2.0.02.- Jocta-3,7-diene (a) Describe in detail how the name triyclo[4.2.0.025 Jocta-3,7-diene is derived from the structure. Tell about each part of the name: tri, cyclo, 4, 2, 0, 0,2-5, octa, 3, 7, di, ene (b) This above reaction...
need help
4. Assume that you have samples of the following two molecules, both with the formula CsH160. a) Suppose you are given one of the above molecules (but not both). How could you use an oxidation reaction to determine which molecule you have? Briefly explain with text and reasonable sketches. b) Suppose you are given one of the above molecules (but not both). How could you use dehydration reaction to determine which molecule you have? Briefly explain with text...
3. Give the structures of the two products for addition reaction of HCI to 3-methyl-1-pentene (1 point), Point out which one is the major product, and explain why! (Hint: dont forget carbocation rearrangement) 4. The transformation of the alkyl chloride shown below into the alcohol can be accomplished in two steps. Show the synthetic scheme to finish the conversion. (1 point) OH
Bonus 3. Give the structures of the two products for addition reaction of HCl to 3-methyl-1-pentene (1 point). Point out which one is the major product, and explain why! (Hint: dont forget carbocation rearrangement) 4. The transformation of the alkyl chloride shown below into the alcohol can be accomplished in two steps. Show the synthetic scheme to finish the conversion. (1 point) Он Br
4. (a) A WileyPlus problem from the (now defunct) Ch. 21 assignment I used to give asked about the product formed from the aromatic nitrile below upon reaction with amide. Their product was actually quite different than mine... That said, both have plausible mechanisms to support their formation. Propose two different mechanisms to explain the formation of the two different products (don't bother drawing the mechanism of the acidic workup that's Ch. 16). (9 points) WP answer 2 equiv KNH2...
1.) (9 points) Give structures for the following compounds: a) meta-phenylphenol b) 6-benzyl-3-heptanol e) ortho-sec-butyltoluene 2.) (9 points) Name the following compounds: 3.) (8 points) Label the following molecules as aromatic, anti-aromatic, or non-aromatic. For the ones th aren't aromatic, explain why they are either non-aromatic or anti-aromatic. 0.8 4.) (11 points) For the following electrophilic aromatic substitution reaction: Вт, FeBr; a) Which product is the major one? b) Draw a complete mechanism for the formation of the major product...
2. Goal of this problem is to study how tunnelling in a two-well system emerges. In particular, we are interested in determining how the tunnelling rate T' of a particle with mass m scales as a function of the (effective) height Vo - E and width b of an energy barrier separating the two wells. The following graphics illustrates the set-up. Initially the particle may be trapped on the left side corresponding to the state |L〉, we are now interested...
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