Phthalocyanines and related compounds: XLVI. [4+2]-cycloaddition of tetraazaporphine to dienes of the cyclopentadiene series

The [4+2]-cycloaddition reaction of unsubstituted tetraazaporphine as the dienophile with a series of dienes of the cyclopentadiene series gave novel norbornene-condensed tetraazachlorins, tetraazabacteriochlorins, and tetraazaisobacteriochlorins. It was shown that, depending on the type of the diene, the reagent ratio, reaction time, and temperature mono-or bis-adducts are formed. The compounds obtained were characterized by the elemental analyses, electronic absorption spectra, 1 H NMR spectra, and mass spectra.