Revisit of the dessy-white intramolecular acetylene-acetylene [2 + 2] cycloadditions

Article abstract of DOI:10.1021/jo061334v

In this experiment, a series of thermal reactions of 4,4′- disubstituted 2,2′-bis(phenylethynyl)biphenyls with 2,3,4,5- tetraphenylcyclopenta-2,4-dienone were carried out under neat conditions and in diphenyl ether at temperatures between 260 and 270 °C t