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1) Fill in the two possible carbocations that can form in an addition...
4 (b) Some of the compounds below may carbocation. Please draw the structures of the carbocations...
4 (b) Some of the compounds below may carbocation. Please draw the structures of the carbocations that are formed. α undergo loss of the tooylane pop o form reaction" if no carbocation can be formed. If a carbocation consists of madiple res structure, draw two resonance structures. Also indicate which carbocation is the stable one. (20 points) NH2
Order these carbocations from most stable (1) to least stable. (5) If there is resonance, that...
Order these carbocations from most stable (1) to least stable.
(5) If there is resonance, that can make the carbocation more
stable than if there isn't; for example, primary benzylic is more
stable than primary allylic, which is more stable than secondary,
as a general rule.
Order these carbocations from most stable (1) to least stable. (5) If there is resonance, that can make the carbocation more stable than if there isn't; for example, primary benzylic is more stable than...
CHM 2440 (FA 2019) 6. Complete the mechanism of addition of HCl to propene below. Please...
CHM 2440 (FA 2019) 6. Complete the mechanism of addition of HCl to propene below. Please use curved arrows to indicate the electron(s) movements. (1 pt, 0.5 pr each) Step 1. Note that the most stable carbocation is formed here. Step 2. 7. Which alkene below reacts most rapidly with HBr to give an alkyl bromide? Circle it. (0.25 pt) Hint: The alkene that can generate the most stable carbocation will react the fastest.
Electrophilic addition of HBr to alkenes yields a bromoalkane.
Electrophilic addition of HBr to alkenes yields a bromoalkane. The reaction begins with an attack on the hydrogen of the electrophilic HBr by the n electrons of the double bond to give a carbocation. This step follows Markovnikov's rule with the electrophilic H atom adding to the sp2 carbon containing the most hydrogens, leading to the formation of the most stable carbocation (1°<2°<3°). If possible, a 1,2-shift of either a neighboring hydride or methyl group can occur prior to the...
east stable most stable The following are three examples of the relative stability of carbocations in...
east stable most stable The following are three examples of the relative stability of carbocations in your answer to question 2. Each of these reactions should show a relatively stable carbocation intermediate. (a) The two-step reaction of 1-methylcyclohexene with HBr follows the Markovnikov 3. rule. (b) Choose 1-butanol or tert-butyl alcohol to undergo a 3-step reaction with HBr to form the alkyl bromide. The second step is the S1 formation of a carbocation. (c) Show the one most stable resonance...
Electrophilic addition of HBr to alkenes yields a bromoalkane.
Electrophilic addition of HBr to alkenes yields a bromoalkane. The reaction begins with an attack on the hydrogen of the elect HBr by the π electrons of the double bond to give a carbocation. This step follows Markovnikov's rule with the electrophilic H adding to the sp2 carbon containing the most hydrogens, leading to the formation of the most stable carbocation (1° < 2° < 3°). If possible, a 1,2-shift of either a neighboring hydride or methyl group can occur...
Consider the reaction below. Understanding what you know about resonance stabilities provides the 2 possible carbocations...
Consider the reaction below. Understanding what you know about resonance stabilities provides the 2 possible carbocations and the resonance structures of H+ addition to the reactant. Circle the carbocation that is the major product due to resonance stabilities. Provide the 1, 2 and 1, 4 products of that carbocation: Why did you pick that carbocation? Provide the 2 unlikely products of 1, 2 and 1, 4 additions from the other carbocation intermediate not chosen above. Hopefully you noted that the...
(4) 6 points) Benzylic Carbocations. Reaction #1 shown below illustrates the acid catalyzed electrophilic addition of...
(4) 6 points) Benzylic Carbocations. Reaction #1 shown below illustrates the acid catalyzed electrophilic addition of H20 to an alkene. This reaction goes through a Benzylic Carbocation Intermediate: HO. Reaction #1 H2SO4 - -- (a) Which one of the following structures is the most reasonable benzylic carbocation intermediate for Reaction #1? ANSWER: answer: он (A) (b) Based on your answer to (a), how many total resonance structures are there for this benzylic carbocation? ANSWER:
O- CHE Br CH2 H3C Hac Electrophilic addition of HBr toalkenes yields a bromoalkane. The reaction...
Electrophilic addition of HBr to alkenes yields a bromoalkane. The reaction begins with an attack on the hydrogen of the electrophilic HBr by the electrons of the double bond to give a carbocation. This step follows Markovnikov's rule with the electrophilic H atom adding to the sp2 carbon containing the most hydrogens, leading to the formation of the most stable carbocation (1° < 2° < 3°). If possible, a 1,2-shift of either a neighboring hydride or methyl group can occur...
help with alcohol rearrangement and carbocations. please explain. thank you for your time. 1. Fill in...
help with alcohol rearrangement and carbocations. please explain.
thank you for your time.
1. Fill in the boxes in the following problem. Pay close attention to stereochemistry. PBrz, pyridine N OH TsCi, pyridine NaOET Etон NaOEt EtOH NaN NaN3 EtOH, A EtOH, A 2. Provide a mechanism for the following reaction.
4 (b) Some of the compounds below may carbocation. Please draw the structures of the carbocations that are formed. α undergo loss of the tooylane pop o form reaction" if no carbocation can be formed. If a carbocation consists of madiple res structure, draw two resonance structures. Also indicate which carbocation is the stable one. (20 points) NH2
Order these carbocations from most stable (1) to least stable.
(5) If there is resonance, that can make the carbocation more
stable than if there isn't; for example, primary benzylic is more
stable than primary allylic, which is more stable than secondary,
as a general rule.
Order these carbocations from most stable (1) to least stable. (5) If there is resonance, that can make the carbocation more stable than if there isn't; for example, primary benzylic is more stable than...
CHM 2440 (FA 2019) 6. Complete the mechanism of addition of HCl to propene below. Please use curved arrows to indicate the electron(s) movements. (1 pt, 0.5 pr each) Step 1. Note that the most stable carbocation is formed here. Step 2. 7. Which alkene below reacts most rapidly with HBr to give an alkyl bromide? Circle it. (0.25 pt) Hint: The alkene that can generate the most stable carbocation will react the fastest.
east stable most stable The following are three examples of the relative stability of carbocations in your answer to question 2. Each of these reactions should show a relatively stable carbocation intermediate. (a) The two-step reaction of 1-methylcyclohexene with HBr follows the Markovnikov 3. rule. (b) Choose 1-butanol or tert-butyl alcohol to undergo a 3-step reaction with HBr to form the alkyl bromide. The second step is the S1 formation of a carbocation. (c) Show the one most stable resonance...
Consider the reaction below. Understanding what you know about resonance stabilities provides the 2 possible carbocations and the resonance structures of H+ addition to the reactant. Circle the carbocation that is the major product due to resonance stabilities. Provide the 1, 2 and 1, 4 products of that carbocation: Why did you pick that carbocation? Provide the 2 unlikely products of 1, 2 and 1, 4 additions from the other carbocation intermediate not chosen above. Hopefully you noted that the...
(4) 6 points) Benzylic Carbocations. Reaction #1 shown below illustrates the acid catalyzed electrophilic addition of H20 to an alkene. This reaction goes through a Benzylic Carbocation Intermediate: HO. Reaction #1 H2SO4 - -- (a) Which one of the following structures is the most reasonable benzylic carbocation intermediate for Reaction #1? ANSWER: answer: он (A) (b) Based on your answer to (a), how many total resonance structures are there for this benzylic carbocation? ANSWER:
help with alcohol rearrangement and carbocations. please explain.
thank you for your time.
1. Fill in the boxes in the following problem. Pay close attention to stereochemistry. PBrz, pyridine N OH TsCi, pyridine NaOET Etон NaOEt EtOH NaN NaN3 EtOH, A EtOH, A 2. Provide a mechanism for the following reaction.
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