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- 4. Design a synthetic scheme using any reagents and reactions that have been discussed in CHEM2402. Only reactions and reagents from CHEM2402 will be considered. iv) i) ملل ii) b) Design a synthetic scheme using the reagents given for the following two reactions. All reagents are used for each reaction scheme and in each case, a reagent can be used more than once. Take the necessary time to complete this question. 2 eq. Br 2 eq. Br H₂/ Lindlar's catalyst Br₂/CH₂Cl₂ 2 одн H NaH H3O+/H₂O H₂/ Lindlar's catalyst PCC/CH₂Cl₂ NaH H H3O+/H₂O CH₂Brb) Design a synthetic scheme using the reagents given for the following two reactions. All reagents are used for each reaction scheme and in each case, a reagent can be used more than once. Take the necessary time to complete this question. i) ii) 2 eq. 2 eq. H₂/ Lindlar's catalyst Br₂/CH₂Cl₂ lo 오오 H NaH H₂O+/H₂O H₂/Lindlar's catalyst PCC/CH₂Cl₂ NaH i H3O+/H₂O CH₂Br4. Design a synthetic scheme using any reagents and reactions that have been discussed in CHEM2402. Only reactions and reagents from CHEM2402 will be considered. a) i) ii) iii) iv) Br Br Br Br the ماں S. OCH3
- Zaitsev's rules predicts generally formed preferentially by both E1 and E2 mechanisms. A) more substituted alkenes B) less substituted alkenes C) tertiary alkyl halides D) primary alkyl halides areConsider the reaction given below: CH3 CH3 NO₂ S & 1) CH3CH₂CH₂CI, AICI3. 2) HNO3, H₂SO4 CH₂CH₂CH3 a) Explain why the reaction provided DOES NOT work. b) Provide the alternative synthetic steps for the reaction.15. Polar protic solvents favor substitution because A) the SN2 mechanism they are weakly slovationg and the nucleophile is able to react rapidly. B) they strongly solvate the nucleophile lowering activation energy for formation of the transition state in the SN2 mechanism. C) they weakly solvate the leaving group allowing rapid loss of the halide according to the Hammond postulate. D) they strongly solvate the leaving group stabilizing the transition state for SN1 reactions according to the Hammond postulate.
- E2 elimination takes place under the same conditions as SN2 substitution and the reactions compete with each other. Which of the following statements is true? a) E2 elimination and SN2 substitution proceed through the same intermediate step b) E2 elimination is only possible for compounds that react with the SN2 mechanism c) In competition, a strong base favors a substitution reaction d) Steric hindrance favors E2 eliminationA strong base is needed for El only. A) B) D) E2 only. both El and E2. D) neither El nor E2. Which of the following statements about E2 elimination from an alkyl halide using sodium methoxide as base is FALSE? The rate of reaction = k₂ [alkyl halide] [NaOCH3] A) The reactivity order for alkyl halides (RX) is tertiary > secondary> primary. B) The rate is independent of the leaving group. The reaction occurs in a single step.In each reaction box, place the best reagent and conditions from the list below. 1) 2) 3) 4) H2O Br2, hv CH3CH2MGBR CH3CH2CU (CH3CH2)2CuLi Br2, NaOH CH3LI CH3CH2CULI Pyridine PBr3 CH3CH2LI (CH3CH2)2Cu CH3MGBR (CH3)2CuLi Br2, H30*
- I. Complete the following statements about mechanisms, bases, and nucleophiles. a) The SN2 mechanism reaction requires a b) The E2 mechanism reaction requires a c) A poor nucleophile makes what mechanism UNlikely? d) A weak base makes what mechanism UNlikely? e) If you determine the SN2 and E2 mechanisms are unlikely, what are you left with?Which one favors E2 reaction? A) isopropoxide ion B) tert-butoxide ion C) ethoxide ion D) tert-pentoxide ion please explain why1. Provide reagents for the first transformation of the synthetic sequence shown below. Draw the final product of the sequence in the box. 1) PhMgBr HO. CI 2) HCI (aq)