title: 2-Cyano-3-(2,3,6,7-tetra-hydro-1H,5H-benzo[ij]quinolizin-9-yl)prop-2-enoic acid dimethyl sulfoxide monosolvate.
abstract: In dimethyl sulfoxide solvated 9-(2-carb-oxy-2-cyano-vin-yl)julolidine, C(16)H(16)N(2)O(2)·C(2)H(6)OS, the essentially planar -CH=(CN)-CO(2)H substituent (r.m.s. deviation = 0.014 Å) is almost coplanar with respect to the benzene ring, the dihedral angle between the two planes being 0.48 (2)°. The conformations of the fused, non-aromatic rings were found to be half-chair. In the crystal, the acid molecule forms a hydrogen bond to the O atom of the solvent mol-ecule. The acid mol-ecule is disordered over two positions with respect to the methyl-ene C atoms in a 1:1 ratio. The crystal studied was found to be a racemic twin.
authors.affiliation: Department of Chemistry, Pennsylvania State University, University Park, PA 16802,  USA.
authors.forename: Hemant
authors.initials: H
authors.lastname: Yennawar
authors.forename: Gang
authors.initials: G
authors.lastname: He
authors.forename: Christopher
authors.initials: C
authors.lastname: Rumble
authors.forename: Mark
authors.initials: M
authors.lastname: Maroncelli