(c) Draw the mechanism of the following and demonstrating the stereochemistry energy diagram, including the transition Describe the optical activity. Br NaN3 ethanol
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- a) Draw the mechanism, using good curved arrow notation, for the reaction of 2-methyl-2- butene with bromine in water, omitting any stereochemistry: b) (R)-3-butyn-2-ol is treated with 2 mol of HBr, yielding optically active Compound A (C4H8OBr2). Draw the structure of the reaction with the correct stereochemistry. c) Name Compound A above, including stereochemistry. d) Compound A is treated with HBr to yield Compound B (C4H7Br3). The resulting solution is optically inactive. Draw the product(s) obtained and explain why there is a loss in optical activity.The reaction shown here yields three different nucleophilic substitution products that are constitutional isomers of one another. (a) Does this suggest an SN1 or Sn2 mechanism? (b) Draw the mechanism for the formation of each of these products. CH3CH2OH BrRefer to the reaction energy diagram to answer parts (a) through (e). (a) What is the rate-limiting STEP? (Select from 1, 2, 3, or 4) (b) The TRANSITION STATE for the fastest step is: (c) In the 3rd step which INTERMEDIATE structurally resembles the transition state according to the Hammon postulate? (d) Which STEP NUMBER is endergonic? (e) The number of intermediates in the overall reaction is:
- This addition of HBr to (Z)-2-bromobut-2-ene takes place regioselectively, with the Br preferentially adding to the alkene C that does not already possess a Br atom. (a) Provide a detailed mechanism for this reaction, including initiation and propagation steps. (b) Explain why this regiochemistry is observed. Br Br HBr ROOR Br4. The given mechanism tracks the transformation of a primary hydroxyl FG into an aldehyde carbonyl using the Swern oxidation ([0]) conditions. Examine the details of the mechanism, paying close attention to the lack of lone pairs, and then respond to the following questions. Note that "reaction arrow" refers to the arrows that separate the reaction steps. (a) Draw a box around the pE2 step (reaction arrow) of the mechanism. (b) Draw a star on any addition (Ad) step (reaction arrow) of the mechanism. (c) Draw a circle around any elimination (E) step (reaction arrow) of the mechanism. (d) When the Swern conditions are characterized as NOT over-oxidizing primary hydroxyl FGs into carboxyl FGs, to what step in the mechanism does this refer? (e) What is the leaving group for the pE2 step in this mechanism? What criteria is used to judge what makes this FG a good leaving group? H3C S=0 H3C H3C → OS- H3C CO2 CO CIO CH2 H3C H3C CH3 H3C H3C H3C CH3 H. H3C O CH3 H3C H NET3 H3C H3C H3C R R NET3The following isomers react separately with sodium hydroxide to give different products with the formulas shown. HO. .CI Но NaOH NaOH C3H1,02 (a) Draw the structure of each product. (b) Draw the mechanism that accounts for the formation of each of those products. (c) Explain why the isomeric reactants lead to different products.
- For each of the following substrates, predict whether a carbocation rearrangement will take place in an Sy1 or E1 mechanism. Explain. Draw the curved arrow notation illustrating the carbocation rearrangement that is likely to occur. (a) (b) (c) (d) .CI Br Br CI (e) (f) (g) HO. OH (h) H;CH2C CH½CH3 (i) Br CI BrThe question is: "Draw the curved arrow mechanism for the reaction between (2S,3S)-3-methylhexan-2-ol and PCl3. Note the specific instructions for each box. Include nonzero formal charges and lone pairs of electrons on all appropriate atoms" I attached screenshots of the picture of the atoms below. What type of reaction (SN1, E1, SN2, or E2) would the reaction be, and how would these molecules interact? The question asks for multiple steps so I am guessing it is either SN1 or E1, but what is the reaction mechanism?Question 5. (20 points) Consider the following reaction. + PhLi (2 eq.) then water a) Propose a structure for the final product. b) Give a complete mechanism for the transformation. c) Draw an energy diagram of the transformation and briefly comment on the relative energies of the starting material, final product, and any intermediate(s), and about the rate determining step.
- 4. An enzyme (acetoacetate decarboxylase) catalyzes the decarboxylation of acetoacetate. The mechanism has been studied extensively; concluding that the key bond-breaking step involves an enamine as a leaving group. Draw a curved arrow mechanism in the boxes below. Label the "iminium” and then "enamine" and then "iminium" as three consecutive intermediates in the mechanism. Note that the acid is stoichiometric PLUS catalytic. (Hint: acid-base involving oxygen should be drawn concerted with other steps) Enz (cat.) NH2 EnzAH EnzAH (cat.) O=U=0 Θ EnzAProvide the MAJOR product of the following reaction and draw the curved-arrow mechanism for the formation of that product. Explain why the provided product is formed over the other possible isomer (ie, explain the reaction's regiochemistry). HCIDraw the mechanism for each of the following reactions. (a) (b) o (c) O NaOCH3, ? KCN .? H20 CgHgSNa .? Ethanol CH;OH