A fast solvent-free method for the metallation of porphyrins is presented. ZnTPP, NiTPP, CuTPP and FeTPP have been prepared mechanochemically by ball milling hydrated metal acetate salts with meso-tetraphenylporphyrin (H2TPP) in a shaker mill for as little as 20 min with no added solvent, avoiding the need for undesirable solvents and long reaction times normally used in such reactions.
K. Ralphs, C. Zhang and S. L. James, Green Chem., 2017, 19, 102 DOI: 10.1039/C6GC02420C
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