α-/β-formylated boron-dipyrrin (BODIPY) dyes: Regioselective syntheses and photophysical properties
Formylation has been performed on pyrrole-unsubstituted dipyrromethanes 1 and boron-dipyrrin (BODIPY) dyes 4 based on a Vilsmeier-Haack reaction. It is highly regioselective and complementary and occurs exclusively at the α-and β-position, respectively, f