Porphodimethylidenes from porphyrin-fused 3-sulfolenes—versatile porphyrin dienes for cycloadditions
Abstract
A porphyrin with a β-fused 3-sulfolene on one of the pyrroles acts as a porphodimethylidene precusor which can be used for a variety of Diels–Alder cycloaddition reactions.