An approach to the synthesis of unsymmetrically substituted chlorobiphenyls

Article abstract of DOI:10.1021/jo00314a025

The Diels-Alder cycloaddition of o-chloranil with phenylacetylenes substituted with chlorine in the ring can afford chlorobiphenyls upon photodecomposition of the brodged diketone adduct.Biphenyls derived from 3-chloro-, 4-chloro-, 2,4-dichloro-, and (2,5