Straightforward, Sustainable and Scalable Access to 3,4-Perylenedicarboxylic Monoanhydride

Perylene dyes are a cornerstone of modern research and technology in fields rang- ing from printed (opto)eletronics to bioimaging. Most known compounds are bisimide derivatives prepared from perylenetetracarboxylic dianhydride (PTCDA), essentially a chemical commodity. On the contrary, there are comparatively fewer reports on perilenedicarboxylic monoimide derivatives not due to lack of performance but due to the challenging access to the key intermediate 3,4-perylenedicarboxylic monoanhy- dride (PDCMA). As we detail, reported synthetic pathways are both costly, resource intensive and associated with extremely poor green metrics. We show a new two-step straightforward, sustainable, efficient and organic solvent free preparation of PDCMA based on a combination of solventless and in-water reactions.