Treatment of dichloro-and dicarboxylato-tin (IV) porphyrins with K2CO3 in THF–H2O (4∶ 1) is a mild and highly efficient method for formation of dihydroxotin (IV) porphyrins; unlike other reported procedures, this method is especially good for lipophilic porphyrins and bis- porphyrins. The synthesis of the mixed metal dihydroxotin (IV) zinc (II) bis-porphyrins 15 and 21 from the corresponding monozinc (II) free-base bis-porphyrins 13 and 19 without loss ...
