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- 8. Suggest a detailed step-by-step reaction mechanism for the reactions shown in a-b (use arrows to show electron flow). CH3 H3C CH3 (a) HO. ОН H,SO4 CH3 CH3 CH3OH CH3 (b) CH-I + HI OCH3For the reaction below which of the following answers (a-i) best describes the major product(s) you would expect form? Choose only one. OH Co(acac)2 CH3l NaHCO3 O2, Et3SiH MeOH, r.t. THC. forms during the burning of marijuna flowers (buds). (၁ OH O a D d) b) HO OHFrom the table of available reagents select the one(s) you would use to convert 1-phenylethanol to acetophenone (PHCOCH3) Use the minimum number of steps; in no case are more than two steps necessary. List reagents by letter in the order that they are used; example: fa. Reagents available g. а. ВНз, ТHF: then H2O2, -OH d. PhMgBr; KMNO4, H2O then H30+ e. LIAIH4; h. POCI3, pyridine b. Br2, FeBr3 then H30+ c. CH3MgBr; f. PCC, then H3 0+ CH2 Cl2
- Choose the best reagents to complete the reaction shown below. HO 0= 0= OH e A B C D E 1.03 2. HOẠC mCPBA 2. H3O+ 1. Hg(OAc)2, H₂O 2. NaBH4, NaOH RCO3H 1. OsO4 (catalytic),9.(a) Based on the reaction scheme in the figure below, draw the structures of J, K, L, M, N, P and condition Q. K L i. LIAIH4 ii. H30 KMNO4 · H*, heat (CH3)2CHOH m - methylbenzoic acid H* SOCI2 pyridine ethanamine condition Q N M3. Using reactions covered in this course. Suggest a synthesis scheme to produce acetaminophen (Tylenol) from phenol. 00-0 On HO acetaminophen phenol OH
- 8. Predict the products of the following reactions and propose a complete mechanism for each reaction. 1 Hg(OAc). CH;OH, 2 NABH, CH, CH,CH,CH=CH, 1. BH3. THF 2. H,O». OH2. The following questions relate to the synthesis of cecropia juvenile hormone (this hormone plays an important role in insect development), which is shown below. MECOCH,CO,Et, NaH CO,Me Br CO,Et HO- then H+, heat Meo- OMe RCO3H МеО CO,Me NaH cecropia juvenile hormone a. Suggest reagents to convert 1 into 2 in two steps. b. Provide a reaction mechanism to explain how 2 is converted into 3. Now thinking backwards from the TM (cecropia juvenile hormone), give the structure of compound 5. d. Is the reaction from 5 to the TM regioselective? Explain your answer. с.Predict the product for the following reaction sequence. 2-methyl-1-propanol PBr3 A. LOH a fou B. E. e Br Br OH C. D. Mg/ether ui OH fa 1. CO₂ 2. H3O+
- Identify the correct reagents and conditions to perform this chemoselective reaction: H ရှုံး H Select one: Me e. Reagent(s) and conditions? a. NaBH4 b. BH3 THF Pd/BaSO4, H₂ (1 atm.), quinoline, Pb(OAC)2, MeOH d. Pd/C, H2 (1 atm.), MeOH DIBAL Me H H OHThe reaction scheme below, proposed by students, will not work. Why not? HO -Br OH Mg HO -MgBr ether 1. cyclohexanone 2. mild H3O+ HO O The Grignard reagent will immediately react with the phenolic OH group, destroying the Grignard reagent before it can react with cyclohexanone. O The H30+ in the second step will destroy the erignard Reagent. O The H3O+ in the second step needs to be strong acid, because the Grignard reagent is a strong base. O Cyclohexanone is too sterically congested.5. Predict the product/s of the reactions: a. b. CH3CH₂- a. CH3 b. 1. BH₂ 2. NaOH, H₂O₂ 1. Hg(OAc)₂, H₂O 2. NaBH4 6. Give the reagent used to complete the reaction: CH3CCH2CH₂COCH3 ? & OH CH3CHCH₂CH₂CH₂OH OH محمد ولد