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- | Exercises 317 9.21 Identify the reactants from which the following molecules were prepared. If an acetal, identify the carbonyl compound and the alcohol; if an imine, identify the carbonyl compound and the amine; if an alcohol, identify the carbonyl compound and the Grignard reagent (red = 0, blue = N): (a) (b) (c)Bromine reacts with alkenes in methanol according to the equation when this reaction was carried out with 4-tert-butylcyclohexene, only one isomer was formed with the molecular formula C12H23BrO (80% yield). Which of the following is the structure more reasonable for this compound? Explain your reasoning through a corresponding mechanism.Citronellol ((3R)-3,7-dimethyloct-6-en-1-ol, C10H20O) is an organic fragrance found in the oil extracted from lemon grass. a) Name the two functional groups present in the molecule. b) When a few drops of bromine dissolved in hexane is added to a sample of citronellol the brown colour of the bromine rapidly disappears. i. What type of chemical reaction has occurred? ii. Draw the structure of the product formed. iii. Name the product. c) The product formed when citronellol is heated with a mixture of potassium dichromate and sulfuric acid gives a yellow/orange precipitate when shaken with Brady’s reagent (2,4-dinitrophenylhydrazine). It also shows a positive result with Fehling’s solution. i. What type of chemical reaction has occurred ? ii. What type of functional group is present in the product? d) Explain the type of stereoisomerism which may occur in citronellol.
- When 2-pentene is treated with Cl2 in methanol, three products are formed. Account for the formation of each product (you need not explain their relative percentages).Which of the following reactions will synthesize phenol from benzene? 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) warm H2SO4 and H2O 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) CuCN; 5) dilute acid and heat 1) Acetyl chloride & AlCl3; 2) bleach 1) Ph-N2+ + KI; 2) BrMgCH=CH2 in ether, followed by H3O+; 3) warm, conc'd KMnO4 1) Cl-CH(CH3)-CH2CH2CH3 + FeBr3; 2) hot, conc'd KMnO4Propene reacts with hydrogen bromide (HBr) at room temperature to produce, 1-bromopropane and 2-bromopropane. H2C=CHCH3 + HBr → CH2(Br)CH2CH3 + CH3CH(Br)CH3 Draw out the reaction mechanism of the reaction between propene and hydrogen bromide to produce 2-bromopropane. Use curly arrows to show the movement of electrons. The description should be detailed and must include the type of bond fission that takes place. You may sketch and insert suitable diagrams to aid your description if you wish. Referring to the above mechanism, explain why two products are formed in the reaction between propene and hydrogen bromide?
- The reaction of ozone with 2-butene leads to -10 formation of aldehyde + ketone 0 aldehyde + alcohol 0 two molecules of carboxylic acid 010. Compound X (C4H9Br) reacts by heating with NaOH in H2O to form Y. The compound Y then undergoes acid catalysed hydration by H2SO, in 180°C to form 2-methyl prop-1-ene. (e) Determine the structure of X and Y. (f) Predict a MAJOR product when compound Y reacts with H2SO4 in 140 C. (g) Draw a structural isomer of X. Name the isomer using IUPAC nomenclature. (h) Describe a chemical test to distinguish between compound Y and 1-butanol.5. Consider the synthesis of 2-butanone from butyne: Hg2+ CH3CH,-C=C–H CH3CH, Ĉ -CH3 H3o* (i) Draw the structure of the compound D. (ii) Compound D isomerizes to form 2-butanone. What is this isomeric process called? (iii) Use the mechanism to show the conversion of compound D to 2-butanone.
- Draw the line-angle formula of the enol formed in the following alkyne hydration reaction and then draw the structural formula of the carbonyl compound with which this enol is in equilibrium. -C=CH 1. (sia)2BH 2. NaOH/H₂O₂ an enol carbonyl compound • You do not have to consider stereochemistry. • Draw both the enol and the carbonyl forms. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures using the sign from the drop-down menu. ChemDoodleⓇ <n-Pentanol (CH3CH2CH2CH2CH2OH) and 2-methylbutan-2-ol (CH3CH2C(CH3)2OH) are converted to their corresponding alkyl chorides on being reacted with hydrogen chloride. (a) Write out an equation for each reaction (b) Assign each the appropriate symbol (SN1 or SN2) (c) Write a suitable mechanism for each reactionConsider the substitution reaction of (R)-3-chloro-3-methylhexane with methanol and heat. H₂C- CH₂ H₂C H₂C Cl CH₂ D No Reaction MeOH Identify the substitution product(s). A a H₂C с H₂C НО CH₂ CH₂ CH₂ B H₂C D H₂C H₂C OH H₂C O CH₂ -CH₂ CH₂