Please answer and EXPLAIN 10 and 11
Homework Answers
10)
For E2 elimination the primary stereo requirement is that the leaving group and H should be in anti periplanar positions, which is always satisfied in open chain copounds.[due to free rotaion of single bond]
However in cyclic alkyl halides , the condition is satisfied only when the leaving group and H both are in axial positions only.
Thus in th egiven example only one side we have axial H , and the major product is formed by abstraction of that proton .
Thus the major product is less substituted A.
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Please answer and EXPLAIN 10 and 11
10) For the E2 reaction shown below, there are...
11/8/19 The cis- and trans-isomers of 1-bromo-2-methylcyclohexane are shown below. One of these isomers undergoes E2...
11/8/19 The cis- and trans-isomers of 1-bromo-2-methylcyclohexane are shown below. One of these isomers undergoes E2 elimination 50 time faster than the other. Illustrate the E2 mechanism using the chair conformers to explain why one isomer is much faster and give the major product of each reaction. 1-BUOK 1-BOK Illustrate the Sw2 mechanism for the reaction below and show what has happened to the stereochemistry of the compound. NaCN acetone
PLEASE ANSWER ALL QUESTIONS Question 5 The reaction below occurs via SN2 and E2 reaction mechanisms....
PLEASE ANSWER ALL QUESTIONS
Question 5 The reaction below occurs via SN2 and E2 reaction mechanisms. The question only requires you to address the E2 reaction only. For the E2 reaction: Use Newman projections to show the relationship between the leaving group and the beta-hydrogen on the carbon labeled with the asterisk ("). 1. If the leaving group and the beta-hydrogen on the carbon labeled with the asterisk (1) are not in the correct orientation, show the result of the...
1. Following the guide on page 154, give the mechanism for the E2 reaction shown below....
1. Following the guide on page 154, give the mechanism for the E2 reaction shown below. КОН CH3 H3CH2CH2C-C-C-CH2CH2CH3 H CH3 H2CH2CH2C-C-C-CH2CH2CH3 H BI 2. Each reaction shown below (a and b) produces three elimination products. Draw all possible products formed. Write "major" under the Zaitsev product. concentrated acid strong base
7. Consider the E2 reaction below and answer the following questions. (1) The stereochemistry of carbon 1 is set as...
7. Consider the E2 reaction below and answer the following questions. (1) The stereochemistry of carbon 1 is set as R, but the stereochemistry of carbon 2 is racemic (50% wedge, 50% dash). Predict the two major organic products of the E2 reaction below. Be sure to indicate the stereochemistry of the products. You do not have to draw a mechanism. (6 pts) Base E2 ii) Determine the relationship between the two products above. Circle one. (3 pts). constitutional isomers...
1) Draw the mechanism for the radical reaction below, including potential resonance structures that explain the...
1) Draw the mechanism for the radical reaction below, including potential resonance structures that explain the product distribution. Draw ALL potential products. Assume only one chlorine is attached to each product. CI 5) Draw both potential products for the reaction below. Indicate the orientation of the groups within the products in the final compounds. 6) Draw the major product for the reaction below. In 10 words or less, explain your answer. OH Excess Br-Br HO
Chem 2200 E1/E2 Practice Problems tn 1. Predict the major produc t in each of the...
Chem 2200 E1/E2 Practice Problems tn 1. Predict the major produc t in each of the following reactions Ha OEt b) Br Ph 2. When 1-chloro-oox(Compound I) is treated with sodium methoxide in methanol, elimination readily occurs to give 1,2-x0oxd compound I). However, the two diastereomers of i (la and lb) each give one single isomer of il (either lla or lib) as shown below. Provide structures for la and ib as well as a mechanistic explanation for the stereopecificity....
QUESTION 20 Consider the dehydration reaction using the starting material shown below to answer questions 20-23...
QUESTION 20 Consider the dehydration reaction using the starting material shown below to answer questions 20-23 Dehydration Which reagent(s) are required to perform a dehydration reaction? o a. HCI С. NaH o d. H2SO4 e. NaOH f, H2SO4, heat g. NaOH, heat QUESTION 21 Identify all carbocations that appear in the mechansim for this reaction. Choose all that apply iv) a. C. eNone of the above. The reaction goes by an E2 mechanism and no carbocations are formed. QUESTION 22...
Consider the reaction below. Note that the stereochemistry of the product is now shown: 12 points....
Consider the reaction below. Note that the stereochemistry of the product is now shown: 12 points. 5. Br2 CH2Cl2 Br Br a. Draw the most stable chair conformation of the starting material (i.e. the alkene). Use the chair template provided on your answer sheet. You do not need to draw ring hydrogens. (2 points) b. Draw a detailed stepwise mechanism for the reaction. Draw all intermediates and use curved arrows to show 'electron movement'. If multiple stereoisomers of the same...
Provide the MAJOR product(s) for the following reactions. SN2 and E2 reaction will only give one...
Provide the MAJOR product(s) for the following reactions. SN2
and E2 reaction will only give one major product (the substitution
of elimination product)
major product (the substitution or elimin SOCI, Pyridine HCI (excess) Heat Oh ot H2SO4, H20 Nas DMF, 25 °C NaOH H20, 55 °C Br
11/8/19 The cis- and trans-isomers of 1-bromo-2-methylcyclohexane are shown below. One of these isomers undergoes E2 elimination 50 time faster than the other. Illustrate the E2 mechanism using the chair conformers to explain why one isomer is much faster and give the major product of each reaction. 1-BUOK 1-BOK Illustrate the Sw2 mechanism for the reaction below and show what has happened to the stereochemistry of the compound. NaCN acetone
PLEASE ANSWER ALL QUESTIONS
Question 5 The reaction below occurs via SN2 and E2 reaction mechanisms. The question only requires you to address the E2 reaction only. For the E2 reaction: Use Newman projections to show the relationship between the leaving group and the beta-hydrogen on the carbon labeled with the asterisk ("). 1. If the leaving group and the beta-hydrogen on the carbon labeled with the asterisk (1) are not in the correct orientation, show the result of the...
1. Following the guide on page 154, give the mechanism for the E2 reaction shown below. КОН CH3 H3CH2CH2C-C-C-CH2CH2CH3 H CH3 H2CH2CH2C-C-C-CH2CH2CH3 H BI 2. Each reaction shown below (a and b) produces three elimination products. Draw all possible products formed. Write "major" under the Zaitsev product. concentrated acid strong base
7. Consider the E2 reaction below and answer the following questions. (1) The stereochemistry of carbon 1 is set as R, but the stereochemistry of carbon 2 is racemic (50% wedge, 50% dash). Predict the two major organic products of the E2 reaction below. Be sure to indicate the stereochemistry of the products. You do not have to draw a mechanism. (6 pts) Base E2 ii) Determine the relationship between the two products above. Circle one. (3 pts). constitutional isomers...
1) Draw the mechanism for the radical reaction below, including potential resonance structures that explain the product distribution. Draw ALL potential products. Assume only one chlorine is attached to each product. CI 5) Draw both potential products for the reaction below. Indicate the orientation of the groups within the products in the final compounds. 6) Draw the major product for the reaction below. In 10 words or less, explain your answer. OH Excess Br-Br HO
Chem 2200 E1/E2 Practice Problems tn 1. Predict the major produc t in each of the following reactions Ha OEt b) Br Ph 2. When 1-chloro-oox(Compound I) is treated with sodium methoxide in methanol, elimination readily occurs to give 1,2-x0oxd compound I). However, the two diastereomers of i (la and lb) each give one single isomer of il (either lla or lib) as shown below. Provide structures for la and ib as well as a mechanistic explanation for the stereopecificity....
QUESTION 20 Consider the dehydration reaction using the starting material shown below to answer questions 20-23 Dehydration Which reagent(s) are required to perform a dehydration reaction? o a. HCI С. NaH o d. H2SO4 e. NaOH f, H2SO4, heat g. NaOH, heat QUESTION 21 Identify all carbocations that appear in the mechansim for this reaction. Choose all that apply iv) a. C. eNone of the above. The reaction goes by an E2 mechanism and no carbocations are formed. QUESTION 22...
Consider the reaction below. Note that the stereochemistry of the product is now shown: 12 points. 5. Br2 CH2Cl2 Br Br a. Draw the most stable chair conformation of the starting material (i.e. the alkene). Use the chair template provided on your answer sheet. You do not need to draw ring hydrogens. (2 points) b. Draw a detailed stepwise mechanism for the reaction. Draw all intermediates and use curved arrows to show 'electron movement'. If multiple stereoisomers of the same...
Provide the MAJOR product(s) for the following reactions. SN2
and E2 reaction will only give one major product (the substitution
of elimination product)
major product (the substitution or elimin SOCI, Pyridine HCI (excess) Heat Oh ot H2SO4, H20 Nas DMF, 25 °C NaOH H20, 55 °C Br
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