Reinvestigation of the Photocyclization of 1,4-Phenylene Bis(phenylmaleic anhydride): Preparation and Structure of Helicene 5,6:9,10-Dianhydride

Article abstract of DOI:10.1021/jo00111a026

The I2-catalyzed photooxidative cyclization of 1,4-phenylene bis(phenylmaleic anhydride) yields two products in an overall yield approaching 80percent.Contrary to a previous report, the major product has been identified by X-ray crystallography as