adj-Dicarbachlorin, the first free base carbaporphyrinoid system with an internal methylene unit†
Abstract
Base-catalyzed condensation of dicyclopentadienylmethane with a dipyrrylmethane dialdehyde gave a dicarbachlorin with an internal CH2 group. This unusual porphyrinoid retained highly diatropic characteristics and exhibited a porphyrin-like UV-vis spectrum.