11-Bromoundecyl methacrylate (0.32 g, 1.0 mmol), N,N-dimethylglycine sodium (0.20 g, 2.1 mmol), and 4-methoxyphenol (trace) were dissolved in 10-ml methanol under nitrogen atmosphere. After reaction at 60°C for 20 hours, the solvent was evaporated off under reduced pressure, and the obtained solid was washed with diethyl ether. The crude product was eluted with chloroform and dried by evaporation. MA-11-COOH was obtained as a milk-white solid with a yield of 44%.

1H NMR (500 MHz, CDCl3): δ (ppm) 6.09 (s, 1H, CH2═C), 5.56 (s, 1H, CH2═C), 4.32 (s, 2H, N─CH2─C═O), 4.13 (t, 2H, ─CH2─OOC), 3.63 (t, 2H, N─CH2─), 3.35 (s, 6H, N─CH3), 1.94 (s, 3H, CH3─C═C), 1.76 (m, 2H, ─CH2─CH2─OOC), 1.67 (m, 2H, ─CH2─CH2─N), and 1.24 to 1.44 [m, 14H, ─(CH2)7─]. MALDI-TOF (positive ion): Calcd m/z for C19H36O4N1+: 342.26; found, 342.27.

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