Considering which of the OH groups should be more accessible to MsCl, suggest a mechanism for the rearrangement of the cyclobutane to the cyclopentane. Me Me Me Me Et3N, MSCI OH -30 to 4 °C OH Me Me
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- Calculate ΔSsys° (J/K) for the catalytic hydrogenation of acetylene to ethane: C2H2(g) + H2(g) → C2H4(g) Substance S° (J/K·mol) C2H2(g) 200.8 H2(g) 130.58 C2H4(g) 219.4A solution of pure (S)-2-iodobutane ([a] = +15.90°) in acetone is allowed to react with radioactive iodide, 131I -, until 1.0% of the iodobutane contains radioactive iodine. The specific rotation of this recovered iodobutane is found to be +15.58°. (a) What does this result suggest about the mechanism of the reaction of 2-iodobutane with iodide ion?8 Give logical fragmentation reactions to account for the following ions observed in these mass spectra.(a) n-octane: 114, 85, 71, 57 (b) methylcyclohexane: 98, 83 (c) 2-methylpent-2-ene: 84, 69(d) pentan-1-ol: 70, 55, 41, 31
- Qa 18. Bromination of 5a-cholestan-3-one occurs at C-2 or C-4 to give 2 regioisomers. Two unsaturated ketones with lambdamax = 230 nm and lambdamax = 241 nm are yielded during dehydrobromination. Use Woodward-Fieser rules to distinguish between the two.at 25C, which of the following reactions of PbS and H2O2 is more favourable?1) PbS + 4H2O2 -> SO2 + PbO2 + 4H2O2) PbS + H2O2 -> PbSO4 + H2OVirgin coconut oil contains about 46-48% of lauric acid (CH3(CH2)10COOH). In thepresence acid catalyst and an alcohol, propose the mechanism of this reaction.
- The reaction of 2,2-dimethyl-1-propanol [(CH3)3CCH2OH], also known by the common name neopentyl alcohol, with HBr is very slow and gives 2-bromo-2-methylbutane as the major product.Give a mechanistic explanation for these observations.Cembrene, C20H32, is a diterpenoid hydrocarbon isolated from pine resin. Cembrene has a UV absorption at 245 nm, but dihydrocembrene (C20H34), the product of hydrogenation with 1 equivalent of H2, has no UV absorption. On exhaustive hydrogenation, 4 equivalents of H2 react, and octahydrocembrene, C20H40, is produced. On ozonolysis of cembrene, followed by treatment of the ozonide with zinc, four carbonylcontaining products are obtained: Propose a structure for cembrene that is consistent with its formation from geranylgeranyl diphosphate.Conformation control of reaction mechansims. Consider the reaction below: Provide all possible elimination products from this reaction and identify the major elimination product. Provide mechanisms (with curved arrows) that clearly explain the reaction outcome.
- I need help proposing a detailed electron pushing mechanism showing the cyclinization of the amide intermediate to benzimidazole. I must show all resonance stabilized carbocations with RSCC letters. Please help!Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by thecatalytic conversion of acetylene to benzene: 3C2 H2(g) ⇌ C6 H6(g). Which value of Kc would make this reactionmost useful commercially? Kc ≈ 0.01, Kc ≈ 1, or Kc ≈ 10. Explain your answerGive logical fragmentation reactions to account for the following ions observed in these mass spectra. (a) 2-methylpent-2-ene: 84, 69 (b) pentan-1-ol: 70, 55, 41, 31