2.3.9. 2-(3-(4-(Dimethylamino)Phenyl)Allylidene)-1*H*-Indene-1,3(2*H*)-Dione **PP19**

3-(4-(Dimethylamino)-phenyl)acrylaldehyde (0.45 g, 2.55 mmol), mexp = 688 mg, 2.27 mmol, 89% yield. 1H nmR (CDCl3) δ: 3.09 (s, 6*H*), 6.69 (d, 2*H*, J = 8.9 Hz), 7.31 (d, 1*H*, J = 15.1 Hz), 7.59 (d, 2*H*, J = 8.4 Hz), 7.64 (d, 1*H*, J = 12.3 Hz), 7.71–7.74 (m, 2*H*), 7.90–7.92 (m, 2*H*), 8.28 (dd, 1*H*, J = 15.1 Hz, J = 12.3 Hz); 13C nmR (CDCl3) δ: 40.1, 111.9, 119.4, 122.4, 122.6, 123.8, 124.5, 131.3, 134.3, 134.4, 140.8, 142.1, 146.5, 152.5, 153.6, 190.8, and 191.2; HRMS (ESI MS) m/z: theor: 303.1259 found: 303.1255 ([M]+. detected).
