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The best reported procedure for synthesis of porphyrins is tetramerization of monopyrrole.In most cases, a solution of aldehyde and pyrrole in a high- boiling acid such as propionic acid as solvent is heated at reflux in air, so that condensation and oxidation occur simultaneously. This method gives low yields of sensitive porphyrins, reflecting rather vigorous conditions, and intractable purification pro-blems arise for porphyrins which do not readily crystallize or precipitate from the tar-laden propionic acid and a high percen-tage of tarry by-products are also formed.

Silica Sulfuric Acid/ZnCl2.6H2O: An Efficient and Green Alternative for the Synthesis of Tetraarylporphyrins

Silica Sulfuric Acid/ZnCl₂.6H₂O: An Efficient and Green Alternative for the Synthesis of Tetraarylporphyrins