1: phenylacetylene With n-butyllithium in tetrahydrofuran T=0°C; 0.5 h; 2: 5-chloro-2-nitro-benzaldehyde in tetrahydrofuran T=0°C; 1 h; 3: With water in tetrahydrofuran

1: With anhydrous iron chloride in chlorobenzene T=70°C; 4 h; Molecular sieve; 2: With SnCl2·2H2O in chlorobenzene T=70°C; 8 h;