title: 6,7-Difluoro-1,2,3,4-tetra-hydro-quin-oxa-line-5,8-dicarbonitrile.
abstract: In the title compound, C10H6F2N4, the Car-N bonds are slightly shortened with respect to a standard aniline C-N bond [1.3580 (16) and 1.3618 (16) versus 1.39 Å], thus indicating some π-π conjgation with the electron-acceptor CN groups. The mol-ecule, except for two C atom of the ethyl-ene bridge, is nearly planar, the largest deviation of the other non-H atoms from the mean plane being 0.309 (2) Å. The N-C-C-N torsion angle involving the ethyl-ene bridge is 50.23 (18)°. In the crystal, mol-ecules are connected by pairs of N-H⋯N hydrogen bonds into chains along [21-1].
authors.affiliation: Key Laboratory of Fine Petrochemical Technology, Changzhou University, Changzhou 213164, People's Republic of China.
authors.forename: Bao-Hua
authors.initials: BH
authors.lastname: Qu
authors.forename: Xiao-Chuan
authors.initials: XC
authors.lastname: Jia
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Ming-Yang
authors.initials: MY
authors.lastname: He