How is ACetic acid, 2,2',2'',2'''-[21H,23H-porphine-5,10,15,20-tetrayltetrakis(4,1-phenyleneoxy)]tetrakis- (CAS: 14172-92-0) typically synthesized?

This compound is typically synthesized through a multistep process involving the condensation of porphyrin and phenylene oxide derivatives. The synthesis involves the use of transition metal catalysts to achieve high selectivity and yield. The process often requires careful control of reaction conditions to ensure the formation of the desired tetradentate porphine derivative.