“…In the last decade, many strides have been made towards the development of more general chlorin syntheses (Montforts and Glasenapp-Breiling, 1998). However, these were exclusively aimed at the synthesis of hydroporphyrins containing geminally dialkylated saturated pyrrole rings as they are found in compounds like bonellin, factors I-III, heme d 1 , siroheme, factor F 430 , and others.…”