4-Propylbenzaldehyde may be used in the synthesis of the following: · (E)-N-(4-propylbenzylidene)-2-((4-methoxyphenyl)amino)acetohydrazide · 2-(4-propylbenzylidene)-1-(5-bromo-2 morpholinopyrimidin-4-yl)hydrazine · H2-5(p-carboxyphenyl)-10,15,20-tri-(4-propyl)phenylporphyrin 4-Propylbenzaldehyde may be used in the synthesis of the following: · (E)-N-(4-propylbenzylidene)-2-((4-methoxyphenyl)amino)acetohydrazide · 2-(4-propylbenzylidene)-1-(5-bromo-2 morpholinopyrimidin-4-yl)hydrazine · H2-5(p-carboxyphenyl)-10,15,20-tri-(4-propyl)phenylporphyrin · 3-(4-propylphenyl)propanenitrile