Di-tert-butyl (1,1'-binaphthyl-2,2'-di-oxy)diacetate.

In the crystal structure of the title compound, C(32)H(34)O(6), the mol-ecule is located on a twofold rotation axis. The two naphthyl fused-ring systems are aligned at 72.6 (1)°. Weak intermolecular C-H⋯O hydrogen bonding is present in the crystal structure.

Dimethyl (1,1'-binaphthyl-2,2'-di-oxy)diacetate.

The two naphthyl fused-ring systems in the title compound, C(22)H(26)O(6), are aligned at 86.7 (1)°. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.

2,2'-(Biphenyl-2,2'-diyldi-oxy)diaceto-hydrazide.

In the mol-ecule of the title compound, C(16)H(18)N(4)O(4), the dihedral angle between the mean planes of the two benzene rings is 56.76 (5)°. The crystal structure reveals extensive inter-molecular hydrogen bonds between carbonyl O atoms and primary amines, as well as between primary and secondary amines of hydrazide, forming rings of R(2) (2)(10) and R(2) (2)(6) motifs, respectively. The structure is further stabilized by intra-molecular and non-classical hydrogen bonds of the types N-H⋯O and C-H⋯O, respectively. The structure does not show any π-π inter-actions.