Organic Chemistry - Standalone book
10th Edition
ISBN: 9780073511214
Author: Francis A Carey Dr., Robert M. Giuliano
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 15, Problem 34P
Like other hydroborations, the reaction of
and its regioselectivity is opposite to Markovnikov's rule.
Use this fact to outline a synthesis of the compound shown from
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Hydroboration-oxidation of 2-pentyne gives a mixture of two ketones, each with the molecular formula C5H10O. Propose structural formulas of these two ketones. Explain your proposal.
An optically active monoterpene (compound A) with molecular formula C10H18O undergoes catalytic hydrogenation to form an optically inactive compound with molecular formula C10H20O (compound B). When compound B is heated with acid, followed by reaction with O3 and then with dimethyl sulfide, one of the products obtained is 4-methylcyclohexanone. Give possible structures for compounds A and B.
Alkynes do not react directly with aqueous acid as do alkenes, but will do so in the presence of mercury(II) sulfate as a Lewis acid catalyst. The reaction occurs with Markovnikov
regiochemistry, so the OH group adds to the more highly substituted carbon and the H adds to the less highly substituted carbon. The initial product of the reaction is a vinyl alcohol, also called
an enol. The enol immediately rearranges to a more stable ketone via tautomerization.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
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Chapter 15 Solutions
Organic Chemistry - Standalone book
Ch. 15.1 - Each of the following organometallic reagents will...Ch. 15.3 - Write equations showing how you could prepare...Ch. 15.4 - Lithium diisopropylamide is often used as a strong...Ch. 15.5 - Write the structure of the organic product of each...Ch. 15.7 - Prob. 5PCh. 15.8 - Prob. 6PCh. 15.9 - Prob. 7PCh. 15.9 - Like nickel, iron reacts with carbon monoxide to...Ch. 15.9 - Prob. 9PCh. 15.9 - What is the oxidation state of manganese in the...
Ch. 15.9 - Prob. 11PCh. 15.10 - Prob. 12PCh. 15.10 - Prob. 13PCh. 15.11 - Give the structure including stereochemistry of...Ch. 15.11 - Prob. 15PCh. 15.12 - Homogeneous catalytic hydrogenation of the...Ch. 15.12 - Prob. 17PCh. 15.13 - What alkenes are formed from 2-pentene by olefin...Ch. 15.13 - The product of the following reaction was isolated...Ch. 15 - Suggest appropriate methods for preparing each of...Ch. 15 - Prob. 21PCh. 15 - Predict the principal organic product of each of...Ch. 15 - Prob. 23PCh. 15 - Predict the principal organic product of each of...Ch. 15 - Prob. 25PCh. 15 - A different stereoisomer of...Ch. 15 - Prob. 27PCh. 15 - Using phenyllithium and any necessary organic or...Ch. 15 - Prob. 29PCh. 15 - A number of drugs are prepared by reactions in...Ch. 15 - The following conversion was carried out in two...Ch. 15 - Outline syntheses of (a)...Ch. 15 - (S)-(+)-Ibuprofen can be prepared by...Ch. 15 - Like other hydroborations, the reaction of alkynes...Ch. 15 - The sex attractant of the female silkworm has been...Ch. 15 - Prob. 36PCh. 15 - (a) Exaltolide, a musk substance, has been...Ch. 15 - Prob. 38PCh. 15 - Prob. 39PCh. 15 - Cyclobutadiene and...Ch. 15 - Cyclobutadiene and (Cyclobutadiene)tricarbonyliron...Ch. 15 - Cyclobutadiene and...Ch. 15 - Cyclobutadiene and...Ch. 15 - Cyclobutadiene and...
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- An unknown hydrocarbon A with the formula C6H10 reacts with 1 molar equivalent of H2 over a palladium catalyst to give B C6H12 (Rxn 1). Hydrocarbon A also reacts with OsO4 to give the glycol C (Rxn 2). A gives 5-oxohexanal on ozonolysis (Rxn 3). Draw the structures of A, B, and C. Give the reactions.arrow_forwardWrite IUPAC name of the products obtained by addition reactions of HBr to hex – 1 –ene.(i) in the absence of peroxide, and(ii) in the presence of peroxide.arrow_forwardWhich of the following statements about 3-iodo-2-methylprop-1-ene is/are true? (i) It has an E isomer and a Z isomer. (ii) It can be converted to an alkyl lithium compound in one step by reacting with lithium metal. (iii) It would react with the following reagent to give 2-methylhept-1-ene as the product: CuLiarrow_forward
- CH3 Br,/FeBr3 C3H;BrO 5 Using resonance structures, justify whether the acetyl group of compound 5 will direct the bromination reaction to the meta or ortho/para positions.arrow_forwardA compound with formula C7H12O is treated with sodium borohydride in methanol to yield 2,2-dimethylcylopentanol. Write a reaction scheme showing the structures of the reactant, the reagents, and the product. Will the product be optically active? Explain.arrow_forwardGive the products, if any, of the benzene + 2 CH3Cl + AlCl3 reaction:arrow_forward
- 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).arrow_forwardThe optically active (2R)-2-phenyl-2-butanol reacts in hydrochloric acid to form haloalkanes and alkenes. The substitution reaction is reported to occur with 100% racemization. Give the structures of the enantiomers that form during the substitution and indicate how much of each is formed. Propose a mechanism for the substitution reaction to yield the R product. What reagents would you use to achieve 100% retention of configuration. Two geometric isomers are obtained during the elimination reaction. Explain mechanistically which alkene will be the main product.arrow_forwardIsoprene has sometimes been used as a starting material in the laboratory synthesis of terpenes. In one such synthesis, the first step is the electrophilic addition of 2 mol of hydrogen bromide to isoprene to give 1,3-dibromo-3-methylbutane.Write a series of equations describing the mechanism of this reaction.arrow_forward
- 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.arrow_forwardConsider the compound C5H9Br (Compound X). It reacts with potassium tert-butoxide to give Compound Y, C5H8. Compound Y upon reaction with hydrogen produced methylcyclobutane. Compound Y upon reaction with ozone produces one compound with two aldehyde functional groups. Provide the structures of Compound X and Y.arrow_forwardHydroboration-oxidation of 2-pentyne gives a mixture of two ketones, each with the molecular formula C5H10O. Propose structural formulas for these two ketones and for the enol from which each is derived.arrow_forward
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