Synthesis of σ-(vinyl)iron(III) porphyrins and (dialkylcarbene)iron(II) porphyrins through the hydrometallation of alkynes with iron(III) porphyrins and NaBH4
Abstract
Treatment of FeIII(tpp)Cl (tpp =meso-tetraphenylporphyrin dianion) with excess of NaBH4 and terminal alkynes in toluene–methanol afforded (dialkylcarbene)FeII(tpp), while the reaction with internal alkynes afforded σ-(vinyl)FeIII(tpp) in good yields.