One pot and solvent-free synthesis of 2,9,16,23-tetrachlorometal(II) phthalocyanines

A novel one pot and solvent-free synthesis of 2,9,16,23-tetrachloro metal(II) phthalocyanines in microwave using monosodium salt of 4-chlorophthalate as starting material is described. This method in comparison to conventional route offers high yields (75-92%), eliminates the use of toxic organic solvents, reduces multistep synthesis to one-step, reaction temperature from 190 to 120 degrees C, and reaction time from 5-6 hours to 5 minutes.