1: 1-(4-methoxyphenyl)hydrazine hydrochloride With polystyrene aldehyde resin; triethylamine in 1,2-dichloro-ethane T=45°C; 2: 4-chloro-benzoyl chloride With pyridine T=80°C; 3: 6-oxo-heptanoic acid With trifluoroacetic acid in 1,2-dichloro-ethane T=70°C;