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Complete detailed spectroscopic characterisation of N-methylacetamide : 1H and 13C NMR and if available MS and...


Complete detailed spectroscopic characterisation of N-methylacetamide : 1H and 13C NMR and if available MS and IR.

please include the required spectra graphs & data while talking about them

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Answer #1

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In 1H NMR data a broad peak around 6.4 ppm is observed for N-H. Broadness of the peak is due to exchange with solvent.

A doublet around 2.7-2.9 ppm is for Hc. Doublet is due to coupling with N-H hydrogen. A singlet around 1.9-2.1 ppm is for Ha. Solvent is ignored in spectra.

N-H 11 10 9 8 7 6 5 4 3 2 1 0 ppm

In 13C NMR spectra a peak around 170 ppm is for Cb. And peaks around 20-28 ppm is for Ca and Cc.

| | | | | | | | | | 200 | 180 | 160 | 140 | | 120 ppm | 100 | 80 | 60 | 40 | 20 | 0

Mass spectra with fragment details is given below

CH3CO C:H:NO CHAN Relative Intensity CHANO CH, 10 15 20 25 30 35 40 50 55 60 65 70 75 45 m/z

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