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- What reagents would you use to carry out the following reaction? (A) H₂ / Pt (B) (C) (D) H₂/Lindlar's ??? Li, EtNH₂ followed by NH4Cl H₂O₂ / NaOHProvide the products formed from the reaction below. Hl(aq) (one equivalent)(a) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) (1) Ph Ph 836 Ph THF A 1 B H₂SO4 100 °C 3 OH Which of the two methods (A or B) is more likely give high yield of methylenecyclohexane 2? Briefly explain.
- Chemistry 3. Complete the following reaction scheme. Give all product(s) and indicate major or minor and any relevant stereochemistry. (а) NaOEt heat (b) heat (c) Br NaCN DMF (d) (e) OH H,SO,/H,PO, heat (f) HBr (g) 1) BH. THE 2) H,0, OH (h) 1) Hg(OAC), H-0 2) NaBH, (i) KMNO, NaOH ColdIdentify (A) in the following reaction. 2H2 Pt (A) KMNO4 Warm conc. || С — С — о—н |CO,H + HO CO2H cis-cyclo hexane 1,2-dicarboxylic acid (a) (b) (c) (d)Q4. Nucleophilic attack at carbonyl with loss of carbonyl oxygen. For this question, answer AT LEAST FIVE of the SIX parts. (a) For the FOUR reactions listed below, draw structures of the major organic products. (i) (ii) (iii) HO OH ●... NMe₂NH₂ cat. dry HCI H Ph₂pⓇ THF
- 4. identify the structure of A and B in the following synthetic scheme: Write out complete reactions for each step, showing the structure of all reactants and products. (a) cyclohexanol +Na2Cr2O7/H2SO4, H2O -------> A (b) A + Et2NH/H2SO4 ----->BChemistry 3. Provide reagents/conditions to accomplish the following syntheses. Several steps are required in some cases. (c) (d) H2N. NH2 но H. NH2 ноWhich of the following compounds is generated by the reaction below? он (1) B2H6, diglyme но. (2) H2O2, NaOH/H2O OH (A) (B) (C) (D) Compound C O Compounds A and C Compounds A and D Compound B
- The key step in a reported laboratory synthesis of sativene, a hydrocarbon isolated from the mold Helminthosporium sativum, involves the following base treatment of a keto tosylate. What kind of reaction is occurring? How would you complete the synthesis?Determine whether each of the following syntheses requires a reaction that alters the carbon skeleton. (a) (b) OH (c) (d) OCH,CH3 CH3 (e) OH (f) H,CO он H;CO. (g) H3CO, (h) H3CO. NO2 NO26. Which of the following will not give Hoffmann bromamide reaction ? (а) CH3 - С-NH2 (Ъ) Ph — С-NH, || (с) CН3 - С-NH - Br (d) Ph – C– NH – Ph