Three new fluorinated<i>N</i>-phenyl-substituted pentacyclic ethanoanthracenedicarboximides
作者:Anke Schwarzer、Edwin Weber
DOI:10.1107/s0108270111042454
日期:2011.11.15
Diels-Alder reaction between maleimides featuring 3,5-di-,2,4,6-tri- and pentafluorinated N-phenyl substituents and anthracene yields the corresponding pentacyclic ethanoanthracenedicarboximide compounds, namely N-(3,5-difluorophenyl)-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboximide, C(24)H(15)F(2)NO(2), (IIa), N-(2,4,6-trifluorophenyl)-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboximide, C(24)H(14)F(3)NO(2), (IIb), N-(2,3,4,5,6-pentafluorophenyl)-9,10-dihydro9,10-ethanoanthracene-11,12-dicarboximide, C(24)H(12)F(5)NO(2), (IIc). The crystal structures of (IIa)-(IIc) reveal an expected molecular geometry with a 'V'-shape of the anthracene-derived tricyclic moiety. The crystal packings of (IIa) and (IIb) are dominated by pi-pi and C-H center dot center dot center dot O/F interactions, while F center dot center dot center dot F and C-H center dot center dot center dot pi contacts are absent. In contrast, (IIc) shows F center dot center dot center dot F and C-H center dot center dot center dot O/F contacts, but no pi-involved contacts of relevance.