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- You are required to synthesize 2-bromopentane from the reaction between an alkene with HBr. Which alkene, 1-pentene or 2-pentene, should you react with HBr in order to get 2-bromopentane? Give an explanation.Table 6.4. Oxidation: Reaction with Baeyer’s reagent (cold, dilute, neutral, aqueous KMnO4) Write (+) if the reaction is positive, (-) if negative. SAMPLE OBSERVATIONS +/- cyclohexane cyclohexene benzene toluene acetylene Enumerate the classes of hydrocarbons that are oxidizable by Baeyer’s reagent. ________________________________________________________________________ ________________________________________________________________________ What is the structural feature of these classes of hydrocarbons? ________________________________________________________________________ ________________________________________________________________________What are the reagents used to convert 2-butyne to C4H8? What are the products when that C4H8 is mixed with OsO4, and H2O (the formula will be C4H10O2 racemic)? What is the product when C4H8 is mixed with RCO3H, and H2O (the formula will be C4H10O2 meso)?
- Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene: 3C2 H2(g) ⟶ C6 H6(g). Which value of Kc would make thisreaction most useful commercially? Kc ≈ 0.01, Kc ≈ 1, or Kc ≈ 10. Explain your answer.The reaction of 3-methylene-1-cyclohexene and HBr yields the four products shown in the attachment. Which two are formed at high temperatures and which two are formed at low temperatures? Why? Why is 1-bromo-3-methylenecyclohexane not formed?1. a) Write an equation (showing all reaction conditions) for the preparation of ethylene (C2H4) from the dehydration of ethanol. 2.) The reaction above (1.a) can also produce ether under certain conditions. Write an equation to show this reaction as well.
- A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2 CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under the same conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C. Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structures of A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions.a. Identify two alkenes that react with HBr to form 1-bromo-1-methylcyclohexane without undergoing a carbocation rearrangement. b. Would both alkenes form the same alkyl halide if DBr were used instead of HBr? (D is an isotope of H, so D+ reacts like H+.)ORGANIC CHEMISTRY - PERICYCLIC REACTIONS Draw the mechanism, explain the stereochemistry of the products, indicate the type of reaction.
- A. Without the use of H2 reductions or PCC oxidation fill in the blank steps of the reactions. Final products should be the major organic product.2. In the bromination reactions, what is the function of CCl4? Why can it fulfil its role?3. Bromination proceeds by either free radical substitution or electrophillic addition. Based on Table 3, which mechanism is followed by alkanes? by alkenes? by alkynes?4. For which hydrocarbon type is light necessary for bromination to take place?5. What is the function of light in the bromination reaction? Why are alkenes and alkynes not included as samples?2. In the bromination reactions, what is the function of CCl4? Why can it fulfil its role?3. Bromination proceeds by either free radical substitution or electrophillic addition. Based on Table 3, which mechanism is followed by alkanes? by alkenes? by alkynes?4. For which hydrocarbon type is light necessary for bromination to take place?