1-Benzyl-3-((2-bromobenzylidene)hydrazono)indolin-2-one (**6d**)

Orange solid (65%) mp = 173–174 ◦C. IR (KBr): νmax (cm−1): 2935(C-H aliphatic), 1722 (C=O), 1606 (C=N). 1H NMR (DMSO-d6, 600 MHz: δ 4.95 (s, 2H, N-CH2-Ph), 6.99 (d, *J* = 4.8, 1H, ArH), 7.06 (t, 1H, ArH), 7.25 (m, 1H, ArH), 7.3–7.37 (m, 4H, ArH), 7.4 (t, 1H, ArH), 7.51 (t, 1H, ArH), 7.58 (t, 1H, ArH), 7.78 (d, *J* = 8.4, 1H, ArH), 7.86 (d, *J* = 7.2, 1H, ArH), 8.22 (d, *J* = 7.2, 1H, ArH), 8.75 (s, 1H, N=CH) ppm. 13C NMR (DMSO-d6, 150 MHz: δ 163.57, 158.38, 149.98, 145.68, 136.37, 134.37, 134.28, 134.15, 132.16, 129.31, 129.19, 129.15, 129.10, 128.00, 127.71, 125.68, 123.64, 116.16, 116.16, 110.68 and 43.22 ppm. ESI mass m/z = 418 [M(79Br) + H]<sup>+</sup>, 420 [M(81Br) + H]<sup>+</sup>.
