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The solvent system toluene:acetic acid:methanol = 5:20:75% (vol./vol.) has been developed for metallation of porphyrins. This system is quite suitable for kinetic studies because it affords stable homogeneous solutions of porphyrins plus metal salts. In this solvent system, Zn 2+ insertion into TPP (IH 2 ) is more than 10 4 times faster than observed in DMF. Kinetics...
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