1-Benzyl-3-((4-methylbenzylidene)hydrazono)indolin-2-one (**6i**)

Pale red solid (82%) mp = 191–192 ◦C. IR (KBr): νmax (cm−1): 2920 (C-H aliphatic), 1722 (C=O), 1683 (C=N), 1602 (C=N). 1H NMR (DMSO-d6, 600 MHz: δ 2.38 (s, 3H, Ph-CH3), 4.95 (s, 2H, N-CH2-Ph), 6.99 (d, *J* = 7.8, 1H, ArH), 7.07 (t, 1H, ArH), 7.22–7.41 (m, 8H, ArH), 7.87 (d, *J* = 8.4, 2H, ArH), 8.00 (d, *J* = 7.2, 1H, ArH), 8.65 (s, 1H, N=CH) ppm. 13C NMR (DMSO-d6, 150 MHz: δ 163.83, 161.88, 150.09, 145.40, 143.17, 136.48, 133.96, 131.14, 130.33, 129.53, 129.19, 127.98, 127.70, 123.55, 116.43, 110.54, 43.18 and 21.74 ppm. ESI mass m/z = 354 [M + H]<sup>+</sup>.
