... Commun., 1980, 8-9. Regiospecific chlorination of aromatic substrates using donor–acceptor and hydrogen bonding interactions. (Note: The full text of this document is currently only available in the PDF Version ). Alain Guy, Marc Lemaire and Jean-Paul Guetté. The chlorination of aromatic substances has been achieved with good regioselectivity using 2,3,4,4,5,6-hexachlorocyclohexa- 2,5-dien-1-one and 2,3,4,5,6,6-hexachlorocyclohexa-2,4-dien-1-one as ...