title: Rac- and meso-3,3'-Bis(3,5-dimethylphenyl)-3H,3'H-2,2'-biindenylidene-1,1'(2H,2'H)-dione.
abstract: In the rac isomer of the title compound, C(34)H(28)O(2), the two C-Ph(dimethylphenyl) bond axes make an angle of 58.7 (1) degrees. There is no short contact between the two 3,5-dimethylphenyl rings, although the dihedral angle between them is 4.93 (7) degrees. The meso isomer has a center of symmetry at the middle of the C=C bond, and the two C-Ph(dimethylphenyl) bond axes are antiparallel to one another.
authors.affiliation: Department of Chemistry, Keio University, Hiyoshi 4-1-1, Kohoku-ku, Yokohama 223-8521, Japan. ohba@flet.keio.ac.jp
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ohba
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Koichi
authors.initials: K
authors.lastname: Tanaka