3.2.4. (Z)-1-Methyl-3-(1-(4-chlorophenyl)ethylidene)indolin-2-one (**(***Z***)-5b**)

75% Yield; yellow solid; mp = 141.5–143.1 ◦C; *<sup>R</sup>*<sup>f</sup> = 0.42 (silica gel, hexane:EtOAc = 4:1); 1H NMR (500 MHz, CDCl3): *<sup>δ</sup>* 7.67 (d, *<sup>J</sup>* = 7.6 Hz, 1H), 7.44–7.38 (m, 2H), 7.34 (td, *<sup>J</sup>* = 7.7, 0.9 Hz, 1H), 7.29–7.26 (m, 2H), 7.11 (td, *J* = 7.7, 0.9 Hz, 1H), 6.86 (d, *J* = 7.7 Hz, 1H), 3.17 (s, 3H), 2.64 (s, 3H) ppm; 13C NMR (125 MHz, CDCl3) *δ* 166.3, 151.5, 143.5, 140.9, 134.1, 129.0, 128.8, 128.5, 124.2, 124.1, 123.4, 122.0, 108.0, 25.8, 25.4 ppm; HRMS (EI): calcd for C17H14ClNO [M+] : 283.0764, found 283.0763.
