Synthesis, non-spherical structure refinement and Hirshfeld surface analysis of racemic 2,2'-diisobut-oxy-1,1'-bi-naphthalene.

In the racemic title compound, CHO, the naphthyl ring systems subtend a dihedral angle of 68.59 (1)° and the mol-ecular conformation is consolidated by a pair of intra-molecular C-H⋯π contacts. The crystal packing features a weak C-H⋯π contact and van der Waals forces.

2-Oxo-2-chromen-4-yl 3,3-di-methyl-butano-ate.

In the crystal of the title compound, CHO, the mol-ecules are connected through C-H⋯O hydrogen bonds, generating [100] chains, which are crosslinked by weak π-π stacking inter-actions.

Synthesis, structure and Hirshfeld surface analysis of 2-oxo-2-chromen-6-yl 4--butyl-benzoate: work carried out as part of the AFRAMED project.

In the title compound, CHO, the dihedral angle between the 2-chromen-2-one ring system and the phenyl ring is 89.12 (5)°. In the crystal, the mol-ecules are connected through C-H⋯O hydrogen bonds to generate [010] double chains that are reinforced by weak aromatic π-π stacking inter-actions.

Crystal structure of 2-oxo-2-chromen-3-yl 4-chloro-benzoate and Hirshfeld surface analysis.

In the title compound, CHClO the dihedral angle between the coumarin ring system [maximum deviation = 0.023 (1) Å] and the benzene ring is 73.95 (8)°.

Crystal structure of 2-oxo-2-chromen-3-yl propano-ate.

In the title compound, CHO, the dihedral angle between the coumarin ring system [maximum deviation = 0.033 (8) Å] and the propionate side chain is 78.48 (8)°.