4. What is the major product of the following aldol reaction? Indicate if it was performed under kinetic or thermodynamic conditions. (6 points) Eto / CH3CH2CHO/A OH ABCD B C. D. D ? C TH +20 111 brs s III br 1 A. Kinetic B. Thermodynamic
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- Which reaction (s) does an anhydride produce? HO. NEl3 CI КОН I. calor OK II NH2 O. IV HO HO. calor III a. Ob., IV Oc. I, II d., II, III, IV8. (20 pt) Draw a mechanism for step 1 and a product & mech with a 2nd equiv. of MeMgBr. Me-MgBr MeMgBr ? MeO H Me HCI workup10. (3 pts) Draw the most likely mechanism for each of the following transformations: a. NO₂ b. Br OCH₁ NO₂ NO2 NaOCH NaNH2, heat C. H₂O OH 0=S=0 NO2 NH₂ NH₂ H2SO4 + - H2SO4
- the epoxide shown will react in acidic methanol to generate which product. Select one: a. None of the choices are correct, the methoxy group will be on a different position. b. (1R,25)-1-Methoxy-1-phenyl-2-propanol X Oc. (1R,2R)-1-Methoxy-1-phenyl-2-propanol O d. (15,25)-1-Methoxy-1-phenyl-2-propanol Oe. (15,2R)-1-Methoxy-1-phenyl-2-propanolPlease pronde ne approprate reagents or product. 1.Os0y,TBHP, H20/THF -> 2. TSOH, acetone, PhH,neat 3. AICI3, CH3COCI, CH2C12 2) 1. B200B2,NBS, CC14> 2. Mg, THF;then Pa°Ln, PhBr 3. HNO3 , HzSo4 4. 2n, HCI me Br Me0 (3 meo MeN HN Meo me BrWhat conjugate base must be formed during the E1cb mechansim in an aldol condensation reaction running under basic conditions? А. enol В. B-hydroxy carbonyl C. a,B-unsaturated carbonyl D. enolate
- What alkyne (or diyne) yields each set of oxidative cleavage products? a. CO2 + CH3(CH2)¿CO2H b. CH;CH2CH(CH3)CO2H only c. CH;CH,CO2H, HO,CCH,CO,H, CH;CO,H d. HO,C(CH2)14CO,HDevise a 4-step synthesis of the product from the starting material. CH3 1. reagent 1 2. reagent 2 H3C HO. 3. reagent 3 4. reagent 4 H3C H. Select reagent 1: Select reagent 2: NH, CH,, cat. H,0+ CH, MGB. Select reagent 4: H, Pd NaBH, LIAIH,What is the major product of this reaction sequence? 1. ELONA/E1OH 2. ВГCH-CH2CH3 (1 ед.) 3. НО", heat 67. b. C d. ОН HO. dl lo
- What is the expected product A for the following crossed aldol reaction? Note, formation of the enolate is carried out under irreversible conditions. 1. LDA, THF, -78 °C H3C. CH3 H. 3. H,O 工 2.A.2. Cross aldol reacttion: aldn donor # aledol acceptor Predict the major product and draw the ran mechanim pka= 17 *Bu OK 0 °C pka: 21 Clue : Byproduct is babel the aldsl donor and aldor acoptor.Convert each compound to its enol or keto tautomer. -OH i asdas CH3 CH3 Draw the aldol product formed from each compound. CH,CHO a. a. a. CHO b. Which carbonyl compounds do not undergo an aldol reaction when treated with "OH in H₂O? ol b. b. (CH3)3CCH,CHO oor & C. d. CH3 CH3 C. į d. (CH3)3C H (CH3)3C CH3 Draw the products formed in each crossed aldol reaction. a. CH3CH,CH,CHO and CH2=O c. CH₂CHO and b. CH₂COCH, and CH₂=O e. CHO