2.3.4. 2-(4-(Dimethylamino)Benzylidene)-1*H*-Indene-1,3(2*H*)-Dione **PP14**

4-Dimethylaminobenzaldehyde (0.38 g, 2.55 mmol), mexp = 580 mg, 2.09 mmol, 82% yield). 1H nmR (CDCl3) δ: 3.14 (s, 6*H*), 6.75 (d, 2*H*, J = 9.2 Hz), 7.70–7.75 (m, 2*H*), 7.78 (s, 1*H*), 7.90–7.94 (m, 2*H*), 8.54 (d, 2*H*, J = 9.2 Hz); 13C nmR (CDCl3) δ: 40.1, 111.4, 122.1, 122.48, 122.49, 123.1, 134.1, 134.3, 137.9, 139.9, 142.3, 147.5, 154.0, 190.0, and 191.7; HRMS (ESI MS) m/z: theor: 277.1103 found: 277.1105 ([M]+. detected).
