1: 1-bromo-2-(bromomethyl)-4-chlorobenzene With triethyl phosphite T=115°C; 2 h; 2: salicylaldehyde With potassium tert-butylate in tetrahydrofuran T=-10°C; Wittig Reaction; 2 h; 3: acetic anhydride in tetrahydrofuran T=-10°C; 0.25 h;

1: C11H15BrClO3P; salicylaldehyde With potassium tert-butylate in tetrahydrofuran T=-10°C; Wittig-Horner reaction; 2 h; 2: acetic anhydride in tetrahydrofuran 0.25 h;