2.3.10. 2-(3,3-*Bis*(4-(Dimethylamino)Phenyl)Allylidene)-1*H*-Indene-1,3(2*H*)-Dione **PP20**

3-(4-(Dimethylamino)phenyl)-acrylaldehyde (0.75 g, 2.55 mmol), mexp = 915 mg, 2.16 mmol, 85% yield. 1H nmR (CDCl3) δ: 3.06 (s, 6*H*), 3.07 (s, 6*H*), 6.67 (d, 2*H*, J = 9.0 Hz), 6.76 (d, 2*H*, J = 8.8 Hz), 7.20 (d, 2*H*, J = 8.7 Hz), 7.45 (d, 2*H*, J = 9.0 Hz), 7.67–7.71 (m, 3*H*), 7.84–7.89 (m, 2*H*), 8.28 (d, 1*H*, J = 12.8 Hz); 13C nmR (CDCl3) δ: 40.1, 40.2, 111.4, 111.5, 118.8, 122.1, 122.3, 123.9, 125.7, 128.8, 130.7, 132.1, 132.7, 133.4, 133.9, 134.1, 140.7, 142.0, 145.5, 151.7, 152.1, 165.5, 191.3, and 191.5; HRMS (ESI MS) m/z: theor: 422.1994 found: 422.1998 ([M]+. detected).
