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Practice Problem 14.9
In 1967 R. Breslow (of Columbia University) and co-workers showed that adding
(a) What new
(b) How many
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Chapter 14 Solutions
Organic Chemistry
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- Compound I (C11H14O2) is insoluble in water, aqueous acid, and aqueous NaHCO3, but dissolves readily in 10% Na2CO3 and 10% NaOH. When these alkaline solutions are acidified with 10% HCl, compound I is recovered unchanged. Given this information and its 1H-NMR spectrum, deduce the structure of compound I.arrow_forwardTreatment of benzoic acid (C6H5CO2H) with NaOH followed by 1-iodo-3methylbutane forms H. H has a molecular ion at 192 and IR absorptions at 3064, 3035, 2960−2872, and 1721 cm−1. Propose a structure for H.arrow_forwardCiprofloxacin is a member of the fluoroquinolone class of antibiotics.(a) Which of its rings are aromatic?(b) Which nitrogen atoms are basic?(c) Which protons would you expect to appear between d 6 and d 8 in the proton NMR spectrum?arrow_forward
- A hydrocarbon, compound B, has molecular formula C6H6, and gave an NMR spectrum with two signals: delta 6.55 pm and delta 3.84 pm with peak ratio of 2:1. When warmed in pyridine for three hr, compound B quantitatively converts to benzene. Mild hydrogenation of B yielded another compound C with mass spectrum of m/z 82. Infrared spectrum showed no double bonds; NMR spectrum showed one broad peak at delta 2.34 ppm. With this information, address the following questions. a) How many rings are in compound C? b) How many rings are probably in B? How many double bonds are in B? c) Can you suggest a structure for compounds B and C? d) In the NMR spectrum of B, the up-field signal was a quintet, and the down field signal was a triplet. How must you account for these splitting patterns?arrow_forward(f) Methyl benzene (toluene) reacts with NO₂+ ions in strongly acidic solution, formed by a nitrating mixture of nitric acid and sulfuric acid. NO₂ 0 °C + NO₂* H* CH3 CH3 Name the aromatic product of this reaction (g) Draw the mechanism for this reaction using curly arrows (h) Sketch the ¹H NMR spectrum of phenol. Your answer should indicate the number of distinct ¹H environments (the multiplicity of each resonance peak is not required) (i) Predict, with reasoning, whether you expect the reactivity of phenol towards NO₂+ ions to be greater than the reaction involving methylbenzene. [word limit=50]arrow_forwardTreatment of ketone A with ethynyllithium (HC≡CLi) followed by D3O+ afforded a compound B of molecular formula C12H13DO3, which gave an IR absorption at approximately 1715 cm−1. What is the structure of B and how is it formed?arrow_forward
- Addition of mesitylene to the strongly acidic solvent HF / SbF5 at -45 °C gives a new species which shows a 1H-NMR resonance at δ 4.67 (2H). Draw the structure of this species.arrow_forwardA) Provide the reagent and reaction mechanism to show how the reactants and products in the following reaction can interconvert B) under what conditions would the reaction I) favour reactants, II) favour the products and III) why?arrow_forwardDraw an isomer of C5H11Cl that would be expected to have four resonances in its 13C NMR spectra.arrow_forward
- Addition of m-xylene to the strongly acidic solvent HF/SbF5 at -45°C gives a new species, which shows 1H-NMR resonances at d 2.88 (3H), 3.00 (3H), 4.67 (2H), 7.93 (1H), 7.83 (1H), and 8.68 (1H). Assign a structure to the species giving this spectrum.arrow_forwardDraw the structure for C5H10O with 1H NMR signals: δ 1.2 (s, 6H), 2.1 (bs, 1H), 5.0 (dd, 1H), 5.2 (dd, 1H), and 5.9 (dd, 1H).arrow_forwardThe enamine prepared from acetone and dimethylamine is shown here in its lowest-energy form. (a) What is the geometry and hybridization of the nitrogen atom? (b) What orbital on nitrogen holds the lone pair of electrons? (c) What is the geometric relationship between the p orbitals of the double bond and the nitrogen orbital that holds the lone pair? Why do you think this geometry represents the minimum energy?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
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