1H NMR (400 MHz, CDCl3) δ 7.41 (s, 1H), 7.38-7.22 (m, 3H), 6.76 (d, J = 15.9 Hz, 2H), 6.06 (d, J = 15.9, 2H), 1.55 (d,J = 1.2 Hz, 12H). 13C{1H} NMR (101 MHz, CDCl3) δ 136.2, 130.9, 129.5, 126.3, 124.7, 123.3, 34.9, 27.6, 23.4. HRMS (EI) m/z calcd for C18H20N2: 264.1261, found 264.1260.