2.3.6. 2-(4-(Diphenylamino)Benzylidene)-1*H*-Indene-1,3(2*H*)-Dione **PP16**

4-(Diphenylamino)benzaldehyde (0.70 g, 2.55 mmol) mexp = 890 mg, 2.22 mmol, 87% yield. 1H nmR (CDCl3) δ: 7.01 (d, 2*H*, J = 8.9 Hz), 7.18-7.22 (m, 6*H*), 7.34–7.38 (m, 4*H*), 7.74–7.76 (m, 2*H*), 7.78 (s, 1*H*), 7.94–7.96 (m, 2*H*), 8.41 (d, 2*H*, J = 8.9 Hz); 13C nmR (CDCl3) δ: 118.9, 122.81, 122.84, 125.4, 125.5, 125.8, 126.6, 129.7, 134.5, 134.7, 136.8, 140.0, 142.4, 145.8, 146.5, 152.7, 189.6, and 191.2; HRMS (ESI MS) m/z: theor: 401.1416 found: 401.1418 ([M]+. detected).
