An efficient and simple methodology has been developed under solvent free condition for the quantitative synthesis of meso-substituted dipyrromethanes from lowest pyrrole/aldehyde ratio. The method was carried out by using I2 as a catalyst. The method is environmentally friendly, easy to workup, and gives excellent yield of the products.
Pyrrole, Aldehyde, Dipyrromethanes, Iodine, Solvent free