Ir-catalysed borylation of phthalonitrile produces both 4-(Bpin)phthalonitrile (1) and 3,5-bis(Bpin)phthalonitrile (2), which are potential divergent intermediates for the synthesis of functionalized phthalocyanines. To exemplify the utility of 2, we have prepared a series of 3,5-bis-arylphthalonitriles that in turn undergo sterically controlled regioselective cyclotetramization to give previously unknown C4h 1,3,8,10,15,17,22,24-octaarylphthalocyanines.
- Phthalocyanines (Pcs)
Mulholland, K. D., Yoon, S., Rennie, C. C., Sitch, E. K., McKay, A. I., Edkins, K., & Edkins, R. M. (2020). Iridium-catalysed 3,5-bis-borylation of phthalonitrile enables access to a family of C4h octaarylphthalocyanines. Chemical Communications. https://doi.org/10.1039/D0CC03161E