A certain compound has a molecular weight of 83 and contains nitrogen. Its infrared spectrum contains a moderately strong peak at 2270 cm-1. Its 1H and 13C NMR spectra are shown in Figure 20.10. What is the structure of this compound?
FIGURE 20.10
The 200-MHz (a) 1H and (b) 13C NMR spectra of the compound in problem 20.42.

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4 4.0 3.0 2.0 1.0 0.0 Chemical shift (. ppm) CH2 CH2 CH, CH3 130 120 110 100 90 80 70 60 50 40 30 20 10 Chemical shift (0, ppm)