2. Short Synthesis Sequence: What are the structures of the missing intermediates a, b, c? CH3 piper Br KOH EtOH brumine, a Pyridinium chlorochromate CH₂Cl2 b EtMgBr Et₂O C
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- In the Directive Effects in the Bromination of Vanillin, the following reaction was performed: CHO сно Br2 CH,CH,CO,H Br OMe OMe OH OH vanillin 5-bromovanillin Which of the following are correct resonance structures of the intermediate cation in this reaction? Mark all that are correct. CHO CHO CHO H. H. H. Br OMe Br OMe Br OMe OH OH A B CHO CHO Br H- CHO H. Br OMe Br OMe OMe OH OH OH FWhat is the best sequence of steps (reagents) to make the following multistep synthesis Br Fuming H2SO4: Bro/AlBr3: H3O. heat; CH3CH2CI/AICI CH3CH2CI/AICI: Fuming H2SO4: Br2/ FeBr3: H30*, heat Bra/FeBrs: H3O, heat; CH3CH2CI/AICI3 CH3CH2CI/AICI3: Br2/ FeBr3: H30*, heat Fuming H2SO4: Br2/FeBr3; H3O+, heat; CH3CH2CI/AICISMC02 How many of the compounds shown are not expected to be converted into Grignard reagent on reaction with Mg in THF? Br NHCH, Me,SiO Br Br Br Br а. 2 b. 3 с.) 4 d. 5 е. 1
- (A) moose the correct product. 1. NaGE, Ero 2. H₂0, A 食。 CO₂ Et -CO₂E7 (B) Coret 31. Choose the best reagents. & 4 (A) 1. LAH; H₂0 2. CHz | 3. H₂0/H+ (B) 1. NaOH, -78% 2. CH31 3. H₂0/H (C) 1. LDA, -78%℃ 2. CH31 3. H₂₂0/H+ 1. Nah, 0°C 2. CH31 3. H₂2₂0/H+* (<) Colt (D)Reagent 3 list; commas separate the choices benzylamine,cyclohexlbromide, cyclohexylamine NaBH3CN catalytic H+, h30, NaOH Reagent 4 list; CH3(Ch2)2MgBr, cyclohexylamine NaBH3CN catalytic H+, Na2 Cr2 O7 H2O H2SO4,cyclohexabromide reagent 5 list; cyclohexylamine NaBH3CN catalytic H+,CH3(Ch2)2MgBr, cyclohexabromide, benzylamineChoose 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),
- Identify the expected major product of the following reaction. Na,Cr207/H2SO4/H2O ? excess но HO ОН H. II IV VDraw the structure of the major product of following reactions: CH212, Zn(Cu) 1. Et,0 MgBr + H3O* 2. Zn 3. HCI CH212, Zn(Cu) 4. Et,0 5. H30* + CH;CH2MGB. CI CI 6. Zn ELOH MgBr H3O* + CO2 7. (CeH)2CuLi + ICH2(CH2)eCH3 diethyl ether 8. CuLi diethyl ether Br 9. Br 10 diethyl ether H3C1.- Describe the reaction mechanism for the following reaction: Me₂N DMF, POCI3 0 °C then A H₂O Me₂N H
- Give mechanisms for the reactions below and explain the selectivity indicated. (i) AN 470M -Me -OH OH Me (ii) 1. MeMgBr 2. HCI, H₂O Br NaOEt, EtOH rather than rather thanIn light of your answer to Problem 30-40, explain why a mixture of products occurs in the following reaction:16). What is the major product of the following reaction? N ZH ZH (A) Br Br 1 eqiv. Br₂ N (B) Br ? (C) XO Br 'N Br (D) Br, (E) Br