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- 1. Give the major product(s) of the following reactions as needed. Include any stereoisomers. NaOEt 1. Br NaOH Br 2. NaOtBu 3. A MEOH 4. Br 2. Which reaction will proceed faster A or B? H,S H2S "CI .... в4. Predict the major organic product(s) of the following reactions. Be sure to clearly identify stereochemistry as appropriate. a. b. C. d. 1. BH3, THF 2. H₂O₂, NaOH Br CH₂12 1. Mg, THF 2. D₂0 Zn-Cu CH₂Cl2 Na DMF15. Give the major organic product, paying attention to stereochemistry (syn/anti). Indicate if a racemic mixture is expected. a. a. BH3 b. H2O2, OH a. BH3 b. b. H2O2, OH a. BH3 a. BH3 C. d. b. H2O2, OH b. H₂O2, OH e. a. BH3 b. H₂O2, OH
- 6. Provide the structure for the major product in the following reactions. b. P f. OH g. Lia * Oia ملی CI 1. SOCI₂, pyr. 2. to Br 2 1. LIAIH4 (xs) 2. H₂O 1. LIAI(OR) 3H 2. H₂O 2. NH₂ Et₂CuLi 1. EtMgBr (xs) 2. H₂O 1. Mg 2. CO₂ 3. H* 4. SOCI₂, pyr 1. [H], NaBH3CN, EtNH₂ CI pyridineProvide the reagents. Но + enantiomer A 1. KOt-Bu, heat 2. mCPBA 3. MeMgBr 4. H2O B. 1. conc. H,SO4, heat 2. MCPBA 3. MeBr С. 1. РBгз 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O D. 1. Br2, hv 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O E. 1. Br2, hv 2. KOt-Bu 3. MCPBA 4. MeBr 5. H2O F. 1. Br2, FeBr3 2. KOt-Bu 3. mCPBA 4. MeMgBr 5. H2O G. 1. Br2, FeBr3 2. KOt-Bu 3. mCPBA 4. MeBr 5. H20What is (are) the major organic product(s) obtained from the following reaction? 1. OsO4 2. NaHSO3 H2O O (2R,3R)-butanediol O (2S,3S)-butanediol O meso-2,3-butanediol O Racemic mixture of (2R,3R)-butanediol and (2S,3S)-butanediol
- Reactions: Provide the structure(s) of the expected maior oreanic productis. Show stereochemistry where needed and write NR if there is no reaction. H2SO4, 1000C heat a. OH OH 1. TSCI, Pyridine 2. NaCN, DMSO b. HO, PCC, DCM с. (CH3);COK d. t-BUOH Cl 1. CH3MGBT, Et,O 2. H;0* C.Which conditions will produce the target product in the highest yield? O A) 1. BH3; 2. H₂O₂, NaOH, H₂O B) 1. OsO; 2. S(CH3)2 C) 1. Hg(OAc)₂, H₂O; 2. NaBH4 D) H₂SO4, H₂O A ? B OH racemic mixture40. Arrange the following alkylhalide in order of decreasing reactivity in an SN1 reaction: I. CH;CH(Br)CH½CH3 II. CH;CH(CI)CH2CH3 III. CICH2CH2CH2CH3 IV. (CH3)2C(Br)CH½CH3 A. I>II>III>IV B. IV>III>II>I C. IV>I>II>III D. IV>II>I>III
- Stereochemistry. Give the structure of the major product formed for each of the following reactions. Provide an explanation for your choice of 160 C(sealedtube) 2.HF,CH3CN.n stereochemistry. a. -> A 97% HF, CH, CN, rt PDC, 4A mol. sieves, CH2Cl2 A97% ic. a. LiN(TMS), TMSCI THF , -100°C b. warm to rt c. 5% aq HCl workup C 71% 3. Stereochemistry. Give the structure of the major product formed for each of the following reactions. Provide an explanation for your choice of stereochemistry. a. 1. OTMS BnO CO₂Me 160 °C (sealed tube) Me b. -Me 2. HF, CH3CN, rt 3. PDC, 4 Å mol. sieves, CH2Cl2 180 °C B toluene (sealed tube) 70% C. a. LiN(TMS)2, TMSCI LOSEM THF,-100 °C b. warm to rt с c. 5% aq HCI workup 71% Et SEM CH2CH2SiMe3 A 97%1. Predict the major products of the following reactions. Include stereochemistry where appeopriate. a. b. d. e. "Mo c. OH £. -OH -OH + HI + HBr X. Ota- + H₂C- OH OTS Jasfa F3C OH + HCI NaCN/DMSO OH OH Ja safa F3C OH SOCI₂ PBry ? CH₂S N DMSO3. Stereochemistry. Predict the stereochemistry of the major product formed for each of the following reactions. Give an explanation for your choice. а. ÇHO SiMe3 A `OPMB MgBr2 • Et20 95% (20:1) b. a. MegAI, Cp2ZrCl2 (cat.) CICH2CH2CI B b. 70% Br, ZnCl2 (1 eq) Pd(0) (cat.) с. 1. CBr4, Ph3P, Zn 2а. п-BuLi (2.1 eq), hexane, THF 2b. H20 workup CHO 3. 56% BH, THE 4. Pd(PPH3)4 (cat.) NaOEt, toluene, 80 °C Br d. Me 2. TSOH• H20 (1.2 ec) TBSO. 1а. Ме2CuLi, Elyо D2 (bicyclic) 94% D1 1b. NC-CO2ME, HMPA 91% 1c. aq NH,CI workup toluene, reflux