A new synthetic protocol for the preparation of 5-cyano-10,15,20- tris(alkoxyphenyl)porphyrins

Abstract

All the existing literatures reveal that meso-cyanoporphyrins are synthesized from porphyrin based start ing materials. We report herein a new synthetic protocol for the preparation of meso-cyanoporphyrins which does not need any porphyrin based starting material. Meso-cyanoporphyrins can be directly syn thesized from pyrrole and aldehyde. A representative crystal structure along with detailed spectroscopic studies are presented and discussed. An attempt has been made to explain the probable mechanism, based on GC-mass analysis of the reaction intermediates.