Question

7. Which compound below best fits the following spectral data?

8. How many signals would you expect to see in the broadband decoupled C^13 spectra of the following compounds?

9. If a proton gave an NMR signal at 3.2 ppm on a MHz NMR, what would the chemical shift be of this proton (in ppm) if the sample was run in 400 MHz NMR?

7. Which compound below best fits the following spectral data? (6 points) H-1 NMR 0.9 ppm (quartet 3 hydrogens; 1.2 ppm ( sextet 2 hydrogens), 2.1 ppm (triplet, 2 hydrogens), 4.3 ppm (singlet 3 hydrogens) C-13 NMR 5 signals 25 ppm (CH3); 35 ppm (CH2), 46 ppm (CH2); 61 ppm; (CHs) 198 ppm (C). IR strong peak 1735 cm Mass Spec parent M+ =102 Hас На 9 H3C-Cc-C-oCH На CH3 CH3 H2 Hсн Hас CH3 Hас H2 D. C. В. А. 8. How many signals would you expect to see in the broadband decoupled C3 spectra of the following compounds? (6 points) -C-CHy Н сн, H2 CH HC-CH-CCH3 На H.C-C-oCH CH3 н CH3 Н,С CH3 NH2 9. If a proton gave an NMR signal at 3.2 ppm on a 60 MHz NMR, what would the chemical shift be of this proton (in ppm) if the sample was run on 400 MHz NMR? (5 points)

Answer 1

o civen: 'H-NMR 0.9 ppm (qucetat, 3H) indicates CH-CH gooup. 1.21pm (sexket, 2H) indicates HC-CH) - CH₂ 2.1 ppm (triplet, ah) indicates He-tu- 4.30pm [singlet, 3H) indicates – OCH Mt = 102 and 5- signals appears in C-NMR spectra Therefore based on the above facts the structure can be written as (8 HC-Chi-Chi-C-OCH = HC-CH-CH - Oct 5, 3H) 0.9 ppm 21 Prolet (2H, tmp 74.30pm (9,3H) 1.2 PPM (sextet, 2H) En IR- spectra peak at 1735 con indicates ester group ③ Number of Be-spectra of the following compounds Hats 4 signals are appear in Be- spectra. HE-CH-CH-CH گیری - 6 signals are appears in C-spectsa. * -o-dau 4 signals ③ CH₂ 7 signals . - 2 signals 4 signals CH 03