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(8 mL) were stirred at room temperature (TPP) during 1 h. After this period, chloroform (200 mL) was added to the solution. A continuous water extraction was carried out, with stirring, until neutralization. The chloroform solution was then washed with sodium hydrogenocarbonate and dried with MgSO4.
After solvent evaporation the chlorosulfonated porphyrins were isolated
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