Organic Chemistry
8th Edition
ISBN: 9781337516402
Author: Brown
Publisher: Cengage
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Chapter 13, Problem 13.15P
Following are three compounds with the molecular formula C4H8O2 and three 1H-NMR spectra. Assign each compound its correct spectrum and assign all signals to their corresponding hydrogens.
(1) 
(2) 
(3) 
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Predict the number of signals in the 1H-NMR spectrum of each isomer.
Predict the theoretical number of different NMR signals produced by each compound,and give approximate chemical shifts. Point out any diastereotopic relationships. vinyl chloride
Compound 1 has molecular formula C7H16. It shows three signals in the 1H-NMR spectrum, one at 0.85 ppm, one at 1.02 ppm, and one at 1.62 ppm. The relative integrals of these three signals are 6, 1, and 1, respectively.
Compound 2 has molecular formula C7H14. It shows three signals in the 1H-NMR spectrum, one at 0.98 ppm, one at 1.36 ppm, and one at 1.55 ppm. The relative integrals of these three signals are 3, 2, and 2, respectively.
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Chapter 13 Solutions
Organic Chemistry
Ch. 13.2 - Calculate the ratio of nuclei in the higher spin...Ch. 13.5 - State the number of sets of equivalent hydrogens...Ch. 13.5 - Each compound gives only one signal in its 1H-NMR...Ch. 13.6 - The line of integration of the two signals in the...Ch. 13.7 - Following are two constitutional isomers with the...Ch. 13.8 - Following are pairs of constitutional isomers....Ch. 13.10 - Following is a 1H-NMR spectrum of 2-butanol....Ch. 13.11 - Explain how to distinguish between the members of...Ch. 13 - Prob. 13.9PCh. 13 - Prob. 13.10P
Ch. 13 - Prob. 13.11PCh. 13 - Following are structural formulas for three...Ch. 13 - Following arc structural formulas for the cis...Ch. 13 - Prob. 13.14PCh. 13 - Following are three compounds with the molecular...Ch. 13 - Following are 1H-NMR spectra for compounds D, E,...Ch. 13 - Following are 1H-NMR spectra for compounds G, H,...Ch. 13 - Propose a structural formula for compound J,...Ch. 13 - Compound K, molecular formula C6H14O, readily...Ch. 13 - Compound M, molecular formula C5H10O, readily...Ch. 13 - Following is the 1H-NMR spectrum of compound O,...Ch. 13 - Treatment of compound P with BH3 followed by...Ch. 13 - The 1H-NMR spectrum of compound R, C6H14O,...Ch. 13 - Write structural formulas for the following...Ch. 13 - Prob. 13.25PCh. 13 - Ascaridole is a natural product that has been used...Ch. 13 - The 13C-NMR spectrum of 3-methyl-2-butanol shows...Ch. 13 - Prob. 13.28P
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- Compound 2 has molecular formula C6H12. It shows three signals in the 1H-NMR spectrum, one at 0.96 ppm, one at 2.03 ppm, and one at 5.33 ppm. The relative integrals of these three signals are 3, 2, and 1, respectively. Provide structure for compound 2, explain how you reached your conclusion.arrow_forward1Compound 1 has molecular formula C7H16. It shows three signals in the 1H-NMR spectrum, one at 0.85 ppm, one at 1.02 ppm, and one at 1.62 ppm. The relative integrals of these three signals are 6, 1, and 1, respectively. Compound 2 has molecular formula C7H14. It shows three signals in the 1H-NMR spectrum, one at 0.98 ppm, one at 1.36 ppm, and one at 1.55 ppm. The relative integrals of these three signals are 3, 2, and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.arrow_forwardCompound 1 has molecular formula C6H12. It shows three signals in the 1H-NMR spectrum, one at 0.96 ppm, one at 2.03 ppm, and one at 5.33 ppm. The relative integrals of these three signals are 3, 2, and 1, respectively. Compound 2 has molecular formula C7H15Br. It shows two signals in the 1H-NMR spectrum, one at 1.08 ppm and one at 1.59 ppm. The relative integrals of these two signals are 3 and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.arrow_forward
- Predict the theoretical number of different NMR signals produced by each compound, and give approximate chemical shifts. Point out any diastereotopic relationships. (a) Ph¬CHBr¬CH2Br (b) vinyl chloridearrow_forwardA'2 The 'H-NMR spectra of cyclohexanol and cyclohexanone are given below. Identify which spectrum belongs to which compound and assign the peaks in each spectrum that substantiate your decision.arrow_forwardA compound with a molecular formula C9H12 has the ¹H NMR spectrum below. Which structures given is consistent with this spectrum? 7 3 6 5 OI O II O III O IV O none of these PPM || لیا 3 9 baad 2 IVarrow_forward
- When the 1î-NMR spectrum of acetone, CH3COCH3, is recorded on an instrument operating at 200 MHz, a single sharp resonance at 2.1î is seen. (a) How many hertz downfield from TMS does the acetone resonance correspond to? (b) If the 1î-NMR spectrum of acetone were recorded at 500 MHz, what would the position of the absorption be in î units? (c) How many hertz downfield from TMS does this 500 MHz resonance correspond to?arrow_forwardThe 'H NMR spectrum of compound A (C3H100) has four signals: a multiplet at 8 = 7.25-7.32 ppm (5 H), a singlet at d = 5.17 ppm (1 H), a quartet at d = 4.98 ppm (1 H), and a doublet at ô = 1.49 ppm (3 H). There are 6 signals in its 13C NMR spectrum. The IR spectrum has a broad absorption in the -3200 cm-1 region. Compound A reacts with KMNO4 in a basic solution followed by acidification to give compound B with the molecular formula C7H6O2. Draw structures for compounds A and B.arrow_forwardThe 1H-NMR spectrum of ethanol shows a triplet at 1.23 ppm, a singlet at 2.61 pm, and a quartet at 3.69 ppm. Assign each signal to the protons it corresponds to in the molecule. Explain the splitting pattern observed for each signal.arrow_forward
- Draw the structural formulas of the following compounds and indicate the number of NMR signals that would be expected for each compound. (a) methyl iodide (b) 2,4-dimethylpentane (c) cyclopentane (d) propylene (propene)arrow_forwardPredict the number of signals in the 1H-NMR spectrum of each isomer.arrow_forwardCompound B has molecular formula C9H12. It shows five signals in the 1H-NMR spectrum - a doublet of integral 6 at 1.22 ppm, a septet of integral 1 at 2.86 ppm, a singlet of integral 1 at 5.34 ppm, a doublet of integral 2 at 6.70 ppm, and a doublet of integral 2 at 7.03 ppm. The 13C-NMR spectrum of B shows six unique signals (23.9, 34.0, 115.7, 128.7, 148.9, and 157.4). Identify B and explain your reasoning.arrow_forward
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