salicylaldehyde in toluene T=60°C; 7 h; Inert atmosphere; chemoselective reaction;

1: Phenylglyoxal With sulfuric acid; Mg(OAc)2·4H2O in water; N,N-dimethyl-formamide T=20°C; 0.166667 h; Inert atmosphere; 2: phenylmethanethiol With hydroquinone in N,N-dimethyl-formamide T=20°C; 1 h; Inert atmosphere; 3: With 2,6-dimethylpyridine in N,N-dimethyl-formamide T=20°C;

N-methyl-pyrrolidine; magnesium nitrate hexahydrate in N,N-dimethyl-formamide