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

16% Yield; yellow solid; mp = 132.1–133.9 ◦C; *<sup>R</sup>*<sup>f</sup> = 0.43 (silica gel, hexane:EtOAc = 4:1); 1H NMR (500 MHz, CDCl3): *<sup>δ</sup>* 7.50–7.42 (m, 2H), 7.25–7.21 (m, 2H), 7.16 (t, *<sup>J</sup>* = 7.2 Hz, 1H), 6.77 (d, *J* = 7.8 Hz, 1H), 6.69 (td, *J* = 7.7, 0.9 Hz, 1H), 6.22 (d, *J* = 7.7 Hz, 1H), 3.27 (s, 3H), 2.78 (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 283.0761.
