Tandem Phospha-Friedel−Crafts Reaction toward Curved π-Conjugated Frameworks with a Phosphorus Ring Junction

The tandem phospha-Friedel−Crafts reaction transforms dichloro(m-teraryl)phosphine to the corresponding triarylphosphine derivatives containing curved π-conjugated frameworks with a phosphorus ring junction. The rigid molecular frameworks enable these unprecedented phosphine compounds to hold an extended π-conjugation spread over the whole molecule.