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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-Methylcyclohexanol3-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.The mass spectrum and 13C NMR spectrum of a hydrocarbon are shown. Propose a structure for this hydrocarbon, and explain the spectral data.
- The 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 HzThe integrated 1H NMR spectrum of a compound of formula C4H10O is shown in FIGURE 13-11. Propose a structure.1H NMR SpectraHow do I solve this?
- Select the correct structure corresponding to the 'H NMR spectrum below. Integration values are shown above/adjacent to each signal. C4H¬OC1 1.50 1.00 1.01 II A) CH;CCHCH3 II В) CICH-CCH-CH, ČI C) CH;CH2CH2CI D) CH;CCH,CH,CI ОА В CWhich of the carbon atoms shown displays the signal that is the most downfield in the 13C NMR spectrum? F -C=N | OI III IV OV I = || ||| -C=C- IV V2) Predict the number of signals expected in the proton spin decoupled 13C NMR spectrum of the compound shown below. H3C. CH3 OCH3
- Choose the data that best matches this partial structure; the hydrogens represented by the data are in bold: H H H Od, 2H, 4.0 ppm Os, 2H, 7.1 ppm Od, 2H, 6.8 ppm Ot, 2H, 6.9 ppm HSelect the structure that best fits the integration ratio and peak position in the ¹H NMR spectrum. || ||| ON 5 I OH 4 هام OH || 3 ppm Hot 2 нал IV 115. Which of the compounds shown displays five signals in its 13C NMR spectrum? Br Br Br Br Br Br Br & & & & & Br Br Br || IV V |||