Homework Answers
Free radical addition of HBr/peroxides to an alkene goes through a radical intermediate that is formed on the least substituted carbon.
Hence, option c) is correct.
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Question 6 Free-radical addition of HBr/peroxides to an alkene goes through A) a carbocation intermediate that...
The addition of HBr to 1,3-butadiene in the presence of a catalytic amount of peroxides
The addition of HBr to 1,3-butadiene in the presence of a catalytic amount of peroxides gives the expected product from anti-Markovnikov addition of HBr to one of the double bonds (BrCH2CH2CH CHa) and another product as shown below. Propose mechanism that explains how this product could be formed via a free radical mechanism. (Note: An ionic mechanism for the addition of HBr is also a possible explanation for the formation of the product. This is not what I am looking for...
13. When HBr is added to a simple alkene containing peroxides, the regiochemistry obtained is in...
13. When HBr is added to a simple alkene containing peroxides, the regiochemistry obtained is in a polar solvent. dded to a simple alkene in the presence of an ether solvent regiochemistry obtained is the reverse of that obtained a. Explain what is meant by an ether solvent (2 pts) b. Write the general formula for a peroxide. (2 pts) c. Explain what is meant by regiochemistry. (2 pts) d. When we say that a solvent is polar what do...
Question 4 (1 point) Which of the following statements is true? HCI addition of an alkene...
Question 4 (1 point) Which of the following statements is true? HCI addition of an alkene goes through a tetrahedral intermediate OHCl addition of an alkene goes through a trigonal bipyramidal transition state HCl addition of an alkene goes through a carbocation transition state OHCl addition of an alkene goes through a carbocation intermediate
Which of the following accounts for the anti-Markovnikov regiochemistry of the reaction of an alkene with...
Which of the following accounts for the anti-Markovnikov regiochemistry of the reaction of an alkene with HBr in the presence of peroxides? A) The alkene reacts with HBr to give a carbocation B) The alkene reacts with a bromine radical to give an alkyl radical C) The alkene reacts with peroxide to give an vinylic radical D) The alkene reacts with peroxide to give an allylic radical
1.1What is the major product formed upon radical bromination of (S)-3-methylhexane? Select the best response. Draw...
1.1What is the major product formed upon radical bromination of (S)-3-methylhexane? Select the best response. Draw the full mechanism. A. (S)-3-bromo-3-methylhexane B. (R)-3-bromo-3-methylhexane C. A mixture of (R) and (S) 3-Bromo-3-methylhexane D. (3R)-1-bromo-3-methylhexane 1.2 What is the major product obtained from the reaction of 2-methyl-2-butene with hydrogen bromide in the presence of peroxides?Select the best response. Draw the mechanism. A. 2,3-dibromo-2-methylbutane B. 2-bromo-3-methylbutane C. 2-bromo-2-methylbutane D. (E)-1-bromo-2-methyl-2-butene 1.3 There are 4 major products formed upon treatment of (E)-3-methyl-2-hexene with HBr...
The following model represents the carbocation intermediate formed in the addition reaction of HBr to two...
The following model represents the carbocation intermediate formed in the addition reaction of HBr to two different alkenes. Draw structures for both alkenes. wireframe M - + labels • You do not have to consider stereochemistry. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.
Acid-catalyzed addition of water to an alkene yields an alcohol with Markovnikov regiochemistry
Acid-catalyzed addition of water to an alkene yields an alcohol
with Markovnikov regiochemistry. The electrophilic H+ adds to the
sp^2 carbon with the most hydrogens to yield the most stable
carbocation intermediate, which then adds water to give the product
alcohol. To avoid the possibility of rearrangement and still give a Markovnikov alcohol, alkenes can instead be treated with mercury(II) acetate in aqucous THF and then subsequently reduced with sodium borohydride. This reaction proceeds through a cyclic mercurinium ion intermediate which...
need help with last hw problems, please explain and the answers thank you O Rank the...
need help with last hw problems, please explain and the
answers thank you
O Rank the substituents below from hiahest priority to lowest using the Cann-ingold, Prelog sequence rules. B. -OH A. A>D>C>B B. B>D>A>C A.-CEN C. A>B>D>C D. D>B>A>C C.-CECH D. C.CH 7. The regiochemistry of hydroboration/oxidation of alkenesis A. Markovnikov. B. Anti-Markovnikov. C. Subject to solvent effects. D. Unrelated to alkene structure. 8. Assign the correct E or Z. cis or trans configuration to the following structure. OH...
Rank the following ethers in order of increasing susceptibility to radical oxygenation to form explosive peroxides...
Rank the following ethers in order of increasing susceptibility to radical oxygenation to form explosive peroxides (weaker C-H bonds are more susceptible to radical oxygenation). Answering ABCD implies that A is the least susceptible to radical oxygenation and D is the most susceptible.
13. When HBr is added to a simple alkene containing peroxides, the regiochemistry obtained is in a polar solvent. dded to a simple alkene in the presence of an ether solvent regiochemistry obtained is the reverse of that obtained a. Explain what is meant by an ether solvent (2 pts) b. Write the general formula for a peroxide. (2 pts) c. Explain what is meant by regiochemistry. (2 pts) d. When we say that a solvent is polar what do...
Question 4 (1 point) Which of the following statements is true? HCI addition of an alkene goes through a tetrahedral intermediate OHCl addition of an alkene goes through a trigonal bipyramidal transition state HCl addition of an alkene goes through a carbocation transition state OHCl addition of an alkene goes through a carbocation intermediate
Which of the following accounts for the anti-Markovnikov regiochemistry of the reaction of an alkene with HBr in the presence of peroxides? A) The alkene reacts with HBr to give a carbocation B) The alkene reacts with a bromine radical to give an alkyl radical C) The alkene reacts with peroxide to give an vinylic radical D) The alkene reacts with peroxide to give an allylic radical
The following model represents the carbocation intermediate formed in the addition reaction of HBr to two different alkenes. Draw structures for both alkenes. wireframe M - + labels • You do not have to consider stereochemistry. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.
need help with last hw problems, please explain and the
answers thank you
O Rank the substituents below from hiahest priority to lowest using the Cann-ingold, Prelog sequence rules. B. -OH A. A>D>C>B B. B>D>A>C A.-CEN C. A>B>D>C D. D>B>A>C C.-CECH D. C.CH 7. The regiochemistry of hydroboration/oxidation of alkenesis A. Markovnikov. B. Anti-Markovnikov. C. Subject to solvent effects. D. Unrelated to alkene structure. 8. Assign the correct E or Z. cis or trans configuration to the following structure. OH...
Rank the following ethers in order of increasing susceptibility to radical oxygenation to form explosive peroxides (weaker C-H bonds are more susceptible to radical oxygenation). Answering ABCD implies that A is the least susceptible to radical oxygenation and D is the most susceptible.
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