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- The 13C-NMR spectrum of 3-methyl-2-butanol shows signals at 17.88 (CH3), 18.16 (CH3), 20.01 (CH3), 35.04 (carbon-3), and 72.75 (carbon-2). Account for the fact that each methyl group in this molecule gives a different signal.arrow_forwardAnalyse the high resolution proton NMR spectrum of a compound with a molecular formula of C8H16O2 and and write its name. Options: A. 2-ethylhexanoic acid B. 1,4-cyclohexanedimethanol C. ethyl hexanoate D. butyl butyrate E. ethyl 2,2-dimethylpropanoatearrow_forwardHow many peaks would you expect to see in the 13C NMR spectrum of 3-bromohexane? a.) 3 b.) 4 c.) 5 d.) 6arrow_forward
- Identify the structures of isomers H and I (molecular formula C8H11N).a.Compound H: IR absorptions at 3365, 3284, 3026, 2932, 1603, and 1497 cm−1b.Compound I: IR absorptions at 3367, 3286, 3027, 2962, 1604, and 1492 cm−1arrow_forwardPlease Annotate the 1H NMR and 13C NMR. The structure is Cyclopentanone C5H8O :)arrow_forwardIR spectroscopy played a key role in elucidating the structure of penicillin G. Explain why the carbonyl on β-Lactams absorbs at ~1760 cm −1, which is much higher than observed in most of other amides.arrow_forward
- 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_forwardAnalyze the high resolution proton NMR spectrum of a compound with the molecular formula C8H16O2 and find out which one. A. 2-ethylhexanoic acid B. 1,4-cyclohexanedimethanol C. ethyl hexanoate D. butyl butyrate E. ethyl 2,2-dimethylpropanoatearrow_forwardHow many signals would you expect to see in the 1H NMR spectrum of each of the five compounds with molecular formula C6H14?arrow_forward
- The compound has a molecular formula of C5H10O and the following 13C spectrum. A proton NMR was measured, but the data was lost except for the fact that it showed three distinct signals: a singlet, a doublet, and a septet, all of which appear between 0 and 3 ppm. Identify the compound, and draw its 1H NMR.arrow_forwardWhat is the structure of the compound with the formula C5H12O, if it has a strong broad IR signal centered near 3330 cm-2, and the 1H-NMR spectrum is: 0.91 ppm (3H triplet) 1.19 ppm (6H singlet) 1.50 ppm (2H quartet) 2.24 ppm (1H singlet)arrow_forwardHow many signals would you expect to see in the 13C NMR spectrum of each of the following compounds? (a) Propylbenzene (b) Isopropylbenzene (c) 1,2,3-Trimethylbenzene (d) 1,2,4-Trimethylbenzene (e) 1,3,5-Trimethylbenzenearrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning