Question

Do not attach any papers. Only this form page will be graded. No formal report needed Unknown #_33_ Molecular Formula: Cs Hols DU (IHD): Show calculation: 2 pul Comments: 2 2 Report IR analysis here. Tabulate Report your 1H NMR analyses here: Tabulate, charnical shift, splitting, neighboring profons, integration, fragments, etc. Group Chem. Shift (ppm) / Integration /Splitting it of Neigh His Fragments MH 1 Conclusion: Draw Structure and match the peaks with the protons

Answer 1

1) The unknown is diethyl carbonate

2) DU = 1 is correct

3) IR:

2850 - 3000 cm-1, strong, sp3 C-H stretch

1747 cm-1, strong, anhydride C=O stretch

1350-1480 cm-1, medium-multiple peaks are due to sp3 C-H bending

1260 & 1000 cm-1, strong, anhydride C-O stretch (symmetric & asymmetric)

850 & 800 cm-1, spe C-H out of plane vibrations (like scissoring, twisting, wagging etc)

4) HNMR:

Group chemical shift (ppm) integration splitting # of neighbor 'H's 4.188 4H quartet triplet 6 4 Fragment COO-CH2-CH3 COO-CH2-CH3 1.293 6H

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