Question: Evidence for restricted rotation around amide CO?N bonds comes from NMR studies. At room temperature, the 1 H NMR spectrum of N, N-dimethyl form amide

Evidence for restricted rotation around amide CO?N bonds comes from NMR studies. At room temperature, the ¹H NMR spectrum of N, N-dimethyl form amide shows three peaks: 2.9 ? (singlet, 3 H), 3.0 ? (singlet, 3 H), 8.0 ? (singlet, 1 H). As the temperature is raised, however, the two singlets at 2.9 ? and 3.0 ? slowly merge. At 180 ?C, the ¹H NMR spectrum shows only two peaks: 2.95 ? (singlet, 6 H) and 8.0 ? (singlet, 1 H). Explain this temperature-dependent behavior.

N,N-Dimethylformamide . CH

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