How many signals would you expect in the proton NMR spectrum for the molecules shown below (Me = methyl)? Br -Br CO₂OH CH2OH CONME2 B C CO₂H D
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- When the 1HNMR spectrum of an alcohol is run in dimethylsulfoxide (DMSO) solvent rather than in chloroform, exchange of the Ο-H proton is slow and spin-spin splitting is seen between the Ο-H proton and C-H protons on the adjacent carbon. What spin multiplicities would you expect for the hydroxyl protons in the following alcohols? (a) 2-Methyl-2-propanol (b) Cyclohexanol (c) Ethanol (d) 2-Propanol (e) Cholesterol (f) 1-MethylcyclohexanolThe following 1H NMR peaks were recorded on a spectrometer operating at 200 MHz. Convert each into δ units. (a) CHCl3; 1454 Hz (b) CH3Cl; 610 Hz (c) CH3OH; 693 Hz (d) CH2Cl2; 1060 Hz3-Bromo-1-phenyl-1-propene shows a complex NMR spectrum in which the vinylic proton at C2 is coupled with both the C1 vinylic proton (J = 16 Hz) and the C3 methylene protons (J = 8 Hz). Draw a tree diagram for the C2 proton signal, and account for the fact that a five-line multiplet is observed.
- 4. How many signals would you observe in the ¹H-NMR spectra of the following molecules? NH OHThe number of peaks in the ¹H-NMR spectrum of a com-pound depends on the number of different kinds (environments)of H atoms. How many peaks appear in the spectrum of each iso-mer of C₄H₁₀and of C₅H₁₂A'H NMR spectrum is shown for a molecule with the molecular formula of CeH9Br. Draw the structure that best fits this data.
- How many peaks would the 1H NMR spectrum of the following molecule have?How many distinct signals would appear in the (proton-decoupled) 13C NMR spectrum for the product of the following reaction? (How many chemically equivalent carbons in the product?) HBr Br ROOR06) Answer the following questions for each of the substances: a) How many signals appear in the 13C NMR spectrum? b) Which signal is at the lowest frequency?