The reaction shown in Figure 3 is an example of a [1,5] hydride shift. Propose a mechanism to account for the rearrangement and state whether it would occur via a suprafacial or an antarafacial pathway according to the Woodward Hoffman rules. H A Figure 3
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- Draw the product of the below reaction, a mechanism and a Molecular Orbital ergy diagram for it. Indicate which levels are used for the reaction. MeO2C hv (light) MeO₂C10. practice q 10 Compound Free Energy HO A A reacts with B in the presence of sodium hydride to give C as a major product. NH₂ Ph B ŌSO₂CF3 NaH, THF a) Provide a detailed mechanism for the formation of C and draw it in the box above. ( C b) Draw the reaction coordinate diagram of that reaction. Indicate with an arrow the rate- determining step of the reaction then draw its transition state: Reaction Coordinate c) The reaction rate observed was 5 x 10-2 M.s¹ when the concentrations of A and B were 0.2 M and 0.1 M respectively. Determine the rate of this reaction when the concentration of A and B are now 0.3 M and 0.2 M respectively. Show your work.How many acid-base steps occur in this mechanism? :OH fö OH ₂ H CI: -H₂O (C5H12O) (CsH3O*) :CI: :CI:- yox (C5H1*) (C5H₁1CI)
- In this chapter, reversibility was discussed only in terms of SN2, SN1, E2, and E1 reactions, but the ideas apply to other reactions as well. Considering charge stability, determine whether each of the following elementary steps is reversible or irreversible. (a) (b) (c) H CH3 :? HÖ:The accepted mechanism for a rearrangement reaction is shown below. "Q Ph (1) (ii) Ph Ph HO™ fast Ph Ph HO O™ slow Ph aufae .Ar² LOH HO™ fast Draw a curly arrow mechanism for this transformation. Sketch an energy profile for this reaction, showing approximate relative energies for the reactants, intermediates, transition states, and products. HQ Ph (iii) When DO™ was used as the reagent, the rate of product formation was same as for HO™. Explain why this result shows that the third step is fast and cannot be rate-determining. Ph (iv) Write the predicted rate equation for this mechanism, and show how it was derived. (v) The starting diketone may have two different aryl groups, as shown below. Propose a ¹³℃ labelling experiment that would allow you to distinguish which of the two aryl groups had migrated in this situation. OH AR²0- Ar¹ C C5. Can you write out the mechanism for the reaction below (note: cyclic brominium ion intermediate) Br H Br/H2O но H H3C Br
- complete the statement below. At -80 °C, Reaction of HBr with Butadiene, the transition state for the secondary product has a lower Ea because it is a more stable QuestDefine Mechanism - The Claisen Reaction ?This is an example of a [1,3] sigmatropic rearrangement. Can someone explain how this is 1,3 (number the carbons) and draw the anion / cation transition state
- Use curved arrows to show how E is converted to F by a two-stepreaction sequence consisting of a [1,5] sigmatropic rearrangementfollowed by a [4 + 2] cycloaddition.Predict the product, draw the mechanism, and plot the reaction coordinate diagram for theE1 reaction.Compound A reacts with B in the presence of sodium hydride to give C as a major product. HO Free Energy A NH₂ Ph B ÖSO₂CF3 NaH, THF a) Provide a detailed mechanism for the formation of C and draw it in the box above. C b) Draw the reaction coordinate diagram of that reaction. Indicate with an arrow the rate- determining step of the reaction then draw its transition state: Reaction Coordinate c) The reaction rate observed was 5 x 10-² M.s¹ when the concentrations of A and B were 0.2 M and 0.1 M respectively. Determine the rate of this reaction when the concentration of A and B are now 0.3 M and 0.2 M respectively. Show your work.