4-[4-(Hept-yloxy)benzo-yloxy]phenyl 2-oxo-7-tri-fluoro-methyl-2H-chromene-3-carboxyl-ate.

The title compound, C31H27F3O7, is a liquid crystal and exhibits enanti-otropic SmA and nematic phase transitions. In the crystal, the the 2H-chromene ring system makes dihedral angles of 54.46 (17) and 7.79 (16)°, respectively, with the central benzene ring and 4-(hept-yloxy)benzene ring. The three F atoms of the -CF3 group are disordered over two sets of sites, with an occupancy ratio of 0.62 (3):0.38 (3). The crystal structre features two pairs of C-H⋯O hydrogen bonds, which form inversion dimers and generate R 2 (2)(10) and R 2 (2)(30) ring patterns. C-H⋯O inter-actions along [100] and C-H⋯π inter-actions futher consolidate the packing, leading to a three-dimensional network.

3-(2-Bromo-acet-yl)-6-fluoro-2H-chromen-2-one.

The non-H atoms of the title compound, C(11)H(6)BrFO(3), are essentially coplanar (r.m.s. deviation for all non-H atoms = 0.074 Å). In the crystal, the molecules are linked by C-H⋯O and C-H⋯Br inter-actions.