1. Provide a multiple step synthesis for the transformation shown below.
2. Identify the carboxylic acid and alcohol needed to make the ester shown below.
3. Propose a mechanism for the reaction shown below.
4. Show all the important resonance structures for the anion
shown below. Include arrows that show how to reach each form.
Indicate which resonance structure makes the greatest
contribution to the resonance hybrid and which resonance structure
makes the least contribution to the resonance
hybrid.
Homework Answers
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1. Provide a multiple step synthesis for the transformation
shown below.
2. Identify the carboxylic acid...
2. Provide a multiple step synthesis for the transformation shown below (4 pts):
2. Provide a multiple step synthesis for the transformation shown below (4 pts):
2) Figure 8.1 displays the reactivity/stability series of carboxylic acid derivatives. In the final step of...
2) Figure 8.1 displays the reactivity/stability series of carboxylic acid derivatives. In the final step of the reaction sequence you will perform in lab, an amine is converted to an amide using acetic anhydride. Rationalize the relative stability of the four carboxylic acid derivatives shown below by considering the % contribution of each of the resonance structures shown. It may be helpful to use the B3LYP/6-316(d) NBO data provided below via QR codes and on Canvas. (4 pts) Нас H3C^x...
4. Consider the molecule BF3. Two possible resonance structures are shown below. :: a) Use curved...
4. Consider the molecule BF3. Two possible resonance structures are shown below. :: a) Use curved arrows to show electron movement. b) Assign formal charges to each resonance contributor. c) Are both structures equally contributing to the resonance hybrid? Which is the better structure and why?
12. Propose a multi-step synthesis to achieve the transformation shown below. Show all necessary reagents and...
12. Propose a multi-step synthesis to achieve the transformation shown below. Show all necessary reagents and conditions. LOH ó-6
Justify answers. Propose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule...
Justify answers.
Propose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step. OH
Provide the complete mechanism for the transformation shown below. Be sure to show every step along...
Provide the complete mechanism for the transformation shown
below. Be sure to show every step along the way, including all lone
pairs of electrons, important resonance contributors,
intermediates, proton transfers, etc.
Image link:
http://i61.tinypic.com/2z4wfo4.jpg
9. P ropose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule...
9. P ropose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step. [It is not necessary to show any mechanisms.] OH 10. Propose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step....
provide a mechanism for this reaction please! Propose a feasible MECHANISM for the reaction shown below,...
provide a mechanism for this reaction please!
Propose a feasible MECHANISM for the reaction shown below, which is occurring under bask conditions. NEATLY & CLEARLY draw all mechanistic intermediates: use arrows correctly to indicate bond making and bond breaking and clearly indicate which atoms(s), if any bear a charge. Draw only ONE resonance structure for any charged intermediates. Count carbons carefully! NaOCH, CH OH
1. Due to the presence of pi (r) bonds, alkenes are nucleophilic. With this information in...
1. Due to the presence of pi (r) bonds, alkenes are nucleophilic. With this information in mind, propose a step-by-step mechanism using curved arrows to indicate electron movements for the reaction shown below. (hint: in the first step a carbocation is formed, which is attacked by the other nucleophilic double bond to form a ring before being attacked by the bromide anion 2. Show how to accomplish the following transformation, clearly show all reagents and reaction conditions necessary to carry...
III. Shown below, the hydration of 2,5-dimethylhexyn-2,5-diol combines several transformations that we learned into one reaction;...
III. Shown below, the hydration of 2,5-dimethylhexyn-2,5-diol combines several transformations that we learned into one reaction; hydration of an alkyne and an acid-catalyzed ether synthesis. Hg2+, H2SO4 (dil) HO OH H20, A Provide a complete electron-pushing mechanism for this reaction shown below in parts A and B. Be sure to show all appropriate arrows, lone pairs, formal charges, intermediates, stereochemistry, bonds, resonance structures of key species, etc... (15 pts)
2. Provide a multiple step synthesis for the transformation shown below (4 pts):
2) Figure 8.1 displays the reactivity/stability series of carboxylic acid derivatives. In the final step of the reaction sequence you will perform in lab, an amine is converted to an amide using acetic anhydride. Rationalize the relative stability of the four carboxylic acid derivatives shown below by considering the % contribution of each of the resonance structures shown. It may be helpful to use the B3LYP/6-316(d) NBO data provided below via QR codes and on Canvas. (4 pts) Нас H3C^x...
4. Consider the molecule BF3. Two possible resonance structures are shown below. :: a) Use curved arrows to show electron movement. b) Assign formal charges to each resonance contributor. c) Are both structures equally contributing to the resonance hybrid? Which is the better structure and why?
12. Propose a multi-step synthesis to achieve the transformation shown below. Show all necessary reagents and conditions. LOH ó-6
Justify answers.
Propose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step. OH
9. P ropose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step. [It is not necessary to show any mechanisms.] OH 10. Propose a multi-step synthesis to accomplish the overall transformation shown below (make the molecule on the right starting with the molecule on the left). Show all necessary reagents and products for each forward step....
provide a mechanism for this reaction please!
Propose a feasible MECHANISM for the reaction shown below, which is occurring under bask conditions. NEATLY & CLEARLY draw all mechanistic intermediates: use arrows correctly to indicate bond making and bond breaking and clearly indicate which atoms(s), if any bear a charge. Draw only ONE resonance structure for any charged intermediates. Count carbons carefully! NaOCH, CH OH
1. Due to the presence of pi (r) bonds, alkenes are nucleophilic. With this information in mind, propose a step-by-step mechanism using curved arrows to indicate electron movements for the reaction shown below. (hint: in the first step a carbocation is formed, which is attacked by the other nucleophilic double bond to form a ring before being attacked by the bromide anion 2. Show how to accomplish the following transformation, clearly show all reagents and reaction conditions necessary to carry...
III. Shown below, the hydration of 2,5-dimethylhexyn-2,5-diol combines several transformations that we learned into one reaction; hydration of an alkyne and an acid-catalyzed ether synthesis. Hg2+, H2SO4 (dil) HO OH H20, A Provide a complete electron-pushing mechanism for this reaction shown below in parts A and B. Be sure to show all appropriate arrows, lone pairs, formal charges, intermediates, stereochemistry, bonds, resonance structures of key species, etc... (15 pts)
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