1H NMR (400 MHz, CDCl3) δ 5.51–5.31 (m, 1H), 5.19 (t, J = 7.7 Hz, 1H), 2.25-2.13 (m, 3H), 1.64-1.55 (m, 4H), 1.42-1.38 (m, 2H), 1.32 (s, 6H), 1.30-1.25 (m, 2H). 13C{1H} NMR (101 MHz, CDCl3) δ 144.54, 125.23, 114.73, 38.16, 37.39, 32.79, 27.75, 26.76, 26.23. HRMS (EI) m/z calcd for C12H19N: 177.1517, found 177.1547.