2.3.5. 2-(2-Butoxy-4-(Diethylamino)Benzylidene)-1*H*-Indene-1,3(2*H*)-Dione **PP15**

2-Butoxy-4-(diethylamino)-benzaldehyde (0.64 g, 2.55 mmol), mexp = 886 mg, 2.35 mmol, 92% yield. 1H nmR (CDCl3) δ: 1.03 (t, 3*H*, J = 7.4 Hz), 1.26 (t, 6*H*, J = 7.1 Hz), 1.60 (qt, 2*H*, J = 7.4 Hz), 1.90 (qt, 2*H*, J = 8.0 Hz), 3.48 (q, 4*H*, J = 7.1 Hz), 4.06 (t, 2*H*, J = 6.4 Hz), 6.03 (d, 1*H*, J = 1.7 Hz), 6.40 (dd, 1*H*, J = 9.3 Hz, J= 1.7 Hz), 7.66–7.70 (m, 2H), 7.85–7.89 (m, 2*H*), 8.48 (s, 1*H*), 9.35 (d, 1*H*, J = 9.3 Hz); 13C nmR (CDCl3) δ: 12.8, 13.9, 19.4, 31.1, 45.0, 68.2, 93.2, 104.9, 112.5, 121.1, 122.1, 122.2, 133.6, 133.9, 137.3, 139.9, 141.1, 142.2, 154.7, 163.7, 190.3, and 192.2; HRMS (ESI MS) m/z: theor: 377.1991 found: 377.1992 ([M]+. detected).
