MacDonald-Type Reactions Using Bis-acrylaldehydes: Synthesis of an Expanded Sapphyrin and Vinylogous Hexaphyrins
摘要:
Acid-catalyzed condensations between a dipyrrylmethane and a pyrrole bisacrylaldehyde gave an unusual stretched sapphyrin structure together with a hexaphyrin byproduct. A diazulihexaphyrin was prepared similarly. The highly diatropic sapphyrin analogue was isolated as a dication and was characterized by X-ray crystallography.