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- Choose the best reagents from the list provided below for carrying out the following conversion. Match the reagent with the step number. HCl (aq), Zn(Hg) Br2, FeBr3 Na/NH3, -33 degrees C NBS, light KMnO4, H3O+ Mg metal, ether KOH, EtOH, heatReaction of (CH3)3CCHO with (C6H5)3P=C(CH3)OCH3, followed by treatment with aqueous acid, affords R (C7H14O). R has a strong absorption in its IR spectrum at 1717 cm−1 and three singlets in its 1H NMR spectrum at 1.02 (9 H), 2.13 (3 H), and 2.33 (2 H) ppm. What is the structure of R? We will learn about this reaction in Chapter 18.7. Propose a mechanism and predict the product, including stereochemistry
- The following reaction occurs at room temperature in acidic solution, first formingintermediate A, which then rearranges into final product B .i. Show the mechanism for the formation of Intermediate A. )ii. Show the mechanism for the rearrangement of A to B. Explain why the reaction does NOT occur readily in basic solution using your mechanism from 2.a8.108 Propose a plausible mechanism for the following transformation, which was used as the key step in the formation of the natural product heliol.1. What is reaction 1? a Halogenation via SR b Halogenation via SE c Halogenation via AE d Hydrohalogenation via AE 2. Which pair of reagent/catalyst is needed for reaction 1? a HBr / DCM b Br2 / CCl4 c NBS / H2O2 d Br2 / uv 3. What is reaction 2? a FC Acylation b FC Alkylation c Halogenation via SE d Bromination
- What is the 1,4-addition product in the reaction eqaution below? What is the 1.2- additional product in the reaction below?M 6 write the principal product in a, c & e and the neccesary reactives for b, d & f in the following reactions :20. (a) Show all steps in the synthesis of 2-pentene from 2-bromopentane. Show the structure of all reactants and product. CH3CHBrCH2CH2CH3 -------> CH3CH=CHCH2CH3 (b) Correctly identify the mechanism in (a) above(SN2, SN1, E2, E1)