Steric Control in the Synthesis of p-Benziporphyrins. Formation of a Doubly N-Confused Benzihexaphyrin Macrocycle

Stępień, M.; Szyszko, B.; Latos-Grażyński, L.
Org. Lett. 2009, 11, 3930-3933 | view at publisher's site

The use of 1,4-phenylene-containing tripyrrane analogs provides a general route to expanded p-benziporphyrins. The course of macrocyclization shows a striking dependence on the steric bulk of meso substituents.