3. Explain, giving structures of important reaction intermediates and transition states, the stereochemical outcome of each of the following reactions. a) 1) LDA/THF/-78°C ۵۰۰۰ 3) acidify (cold) R major (racemic) OH Ph & minor (racemic) OH Ph
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- Predict the major products of the follow ing. (c) (a) (b) CI HO,S HNO3 Cl2, ? AICI3 FeCla H,SO, H3CO (e) (d) Br2, ? Conc. HNO, ? FeBr3Predict the product (s) with the appropri ate regio and stereochemical outcom e and provide a curved arrow mechanism for the reaction shown (hint: isopropanol reacts with intermediate) Cl, ? IsopropanolFor the following reaction provide the mechanism for the major products under thermodynamic and kinetic control. HCI
- Refer 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:What is the full mechanism for the oxidation of cyclododecanol through NaOCI; EtOAc/H2O, Bu4NBr, HCI-cat ? Please include all arrows and formal charges.What type of eliminaton reactions occur in this process?
- b) Provide a detailed mechanism (with arrows) and show all relevant reaction intermediates for the following azo coupling reaction. -ZEZ Br NO CIO N Br 'N-Remaining Time: 38 minutes, 15 seconds. * Question Completion Status: 100 110 120 130 14 15 16 1 36 38 39 40 41 42 430 44 45 46 47 48 49 50 37 QUESTION 2 Which of the following reactions proceeds through a carbocation intermediate? OEpoxidation O Oxymercuration/Reduction O Hydroboration/Oxidation O Acid-catalyzed hydration O Both A and B QUESTION 3 nat alkyl bromide should be used in the acetoacetic ester synthesis of the follow CH;CH;CH;ĊCH3 ve and Submit to save and submit. Click Save All Answers to save all answers. F2 F3 F4 F5 @ # 24 3 W E R18.07a2 Add curved arrow(s) to draw the second step of the mechanism. Modify the given drawing of the products as needed to show the intermediate that is formed in this step (a sigma complex). Use the +/- tools to add/remove charges, and use the single bond tool to interconvert between double and single bonds.
- For each of the following pairs of species, which is the stronger nucleophile in ethanol? Explain. (a) H3C-OH or H,C-o° (b) H3C-OH or H;C-NH, (c) or (d) (е) CH3S` CH3SE (f) CH;Se or or BrAmong the given in the picture which intermediate is the least stable, most stable and would most likely undergo a hydride-shift?Which of the following is most prone to hydration (acid-catalyzed reaction with water)?