title: A [4 pi+4 pi] intramolecular photocyclomer of 9-anthroic anhydride: 5,6,11,12-tetrahydro-5,12;6,11-di-o-benzenodibenzo[a,e]cyclooctene-5,6-dicarboxylic anhydride.
abstract: The title compound, C(30)H(18)O(3), was obtained by light irradiation of a dichloroethane solution of 9-anthroyl chloride and 9-anthroic acid. The molecules, which possess approximately mm2 local symmetry, are packed in columns, the oxygenated moieties facing each other according to the symmetry of a monoclinic lattice. The space group of the crystal is P2(1)/c, with a whole molecule as the asymmetric unit. The structure is compared with those of similar dianthracene derivatives.
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Cicogna
authors.forename: Giovanni
authors.initials: G
authors.lastname: Ingrosso
authors.forename: Fabio
authors.initials: F
authors.lastname: Marchetti