Abstract
Abstract The results described above extend further the data obtained by Ma and Warnhoff ( 5 ) and it can be seen that valuable further information can be obtained in going to still stronger acid like perchloric acid. The data obtained by these authors in trifluoroacetic acid has been compared with the data in perchloric acid in Table 3. 3 . Chemical Shifts of N -Methyl Group in Weak Amines in CF 3 COOH and HClO 4 δ cps in Compound CF 3 COOH HClO 4 42% 70% 1. Nicotine 186.0 (unsplit) 201.5 (d) 196(d) 2. N -Methyl aniline 190.0 (unsplit) 198 (broad) 206(t) 195.0 (partially resolved triplet at 27 °C) 3. N,N -Dimethyl aniline 207.5(d) 212 (broad) 209(d) 4. N -Methyl-2-pyrrolidone 185.5 (unsplit) — 204 (unsplit) 5. Theophylline 218.5 (unsplit) — 220.0 (unsplit) 231.0 — 233.0 (unsplit)
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