Di-tert-Butyl 2,2′-[2,2′-methyl­enebis(naphthalene-2,1-diyldi­oxy)]diacetate

In the title compound, C33H36O6, two naphthalene ring systems are connected through a methyl­ene linkage [C—C—C = 114.9 (2)°]; the ring systems are aligned at an angle of 76.5 (1)°. Of the two –O–CH2–C(=O)–C(CH3)3 substituents, one adopts an extended conformation whereas the other is U-shaped. In the crystal, mol­ecules are linked via weak C—H⋯O hydrogen bonding, forming supra­molecular chains running along the c axis

Bis[5-chloro-2-(prop-2-yn-1-yl­oxy)phen­yl]methane

The mol­ecule of the title compound, C19H14Cl2O2, has two benzene rings connected to a methyl­ene C atom, and the rings are aligned at 66.3 (1)°. Inter­molecular C—H⋯π and π–π stacking inter­actions are observed in the crystal structure, the centroid–centroid distances between parallel benzene rings being 3.7529 (12) and 3.6201 (12) Å, respectively

tert-Butyl 2-(4-nitro­phen­oxy)acetate

In the title mol­ecule, C12H15NO5, the nitro­phen­oxy portion is approximately planar (r.m.s. deviation = 0.034 Å) and makes an angle of 84.8 (1)° with respect to the –CH2–C(=O)–O–C fragment. In the crystal, π–π stacking is observed between nearly parallel benzene rings of adjacent mol­ecules, the centroid–centroid distance being 3.6806 (10) Å. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

5,7-Dihy­droxy-3,6-dimeth­oxy-2-(4-meth­oxy­phen­yl)-4H-chromen-4-one monohydrate

The title compound, C18H16O7·H2O, is a flavonoid isolated from Dodonaea viscosa­. The benzopyran ring system of the flavonoid is essentially planar [maximum deviation = 0.025 (2) Å] and inclined at 5.83 (2)° to the attached benzene ring. The water of hydration is involved in extensive hydrogen bonding, assembling the mol­ecules into a supra­molecular network via classical inter­molecular O—H⋯O hydrogen bonding. The crystal structure is further stabilized by π–π stacking inter­actions [centroid–centroid distance between benzene rings = 3.564 (3) Å]

6,7-Dihydro-3H-1,4-diazepino[1,2,3,4-lmn][1,10]phenanthroline-3,9(5H)-dione

In the title compound, C15H12N2O2, the seven-membered ring bearing the three methyl­ene C atoms displays a puckered conformation, with the methyl­ene C atoms deviating from the plane of the benzene ring by 0.05 (1), 0.98 (1) and 1.04 (1) Å. The phenanthroline unit is not planar; the dihedral angles between this benzene ring and the other pyridyl rings are 9.62 (4) and 9.31 (4)°. The crystal packing is stabilized by π–π inter­actions between two phenanthroline ring systems, forming a centrosymmetric dimer with a centroid–centroid distance of 3.656 (1) Å

Diethyl 2,2′-(biphenyl-2,2′-diyldi­oxy)diacetate

In the title compound, C20H22O6, the mean planes through the benzene rings make a dihedral angle of 59.82 (7)° with each other. Weak inter­molecular C—H⋯O inter­actions together with π–π stacking inter­actions [centroid–centroid distance = 3.830 (1) Å] between benzene rings are observed in the crystal packing

Methyl (2′-hydroxy­biphenyl-2-yl­oxy)acetate

The three independent mol­ecules of the title compound, C15H14O4, have similar orientations of their aromatic rings, the dihedral angles between the rings being 57.0 (1), 58.1 (1) and 58.2 (1)°. In each mol­ecule, the hydr­oxy group forms an intra­molecular hydrogen bond to the carbonyl O atom, forming an S(10) ring motif

Bis[3-(2H-benzotriazol-2-yl)-2-(prop-2-yn­yloxy)-5-(2,4,4-trimethyl­pentan-2-yl)phen­yl]methane

In the title compound, C47H54N6O2, the C—C—C bond angle between the rings is 108.40 (13)°. One aryl ring aligned at 38.5 (1)° with respect to the N-heterocyclic substituent and the other at 56.0 (1)° with respect to its substituent. In the crystal, adjacent mol­ecules are linked by C—H⋯N hydrogen bonds, forming a chain extending along the a axis

2-(2-Methyl-5-nitro-1H-imidazol-1-yl)ethyl 2-nitro­benzoate

In the title compound, C13H12N4O6, the mean plane through the nitro­benzene forms a dihedral angle of 37.38 (15)° with the plane through the imidazole ring. The crystal packing is stabilized by weak inter­molecular C—H⋯O and C—H⋯N inter­actions together with π–π stacking inter­actions between nitro­benzene rings [centroid–centroid distance = 3.788 (3) Å] and between imidazole rings [centroid–centroid distance = 3.590 (2) Å]

Dimethyl 2,2′-({2,2′-methyl­enebis[6-(2H-benzotriazol-2-yl)-4-(2,4,4-trimethyl­pentan-2-yl)-2,1-phenyl­ene]}di­oxy)diacetate

The asymmetric unit of the title compound, C47H58N6O6, comprises three independent mol­ecules, in one of which one tert-butyl group is disordered in a 1:1 ratio. The mol­ecule is a di(ar­yl)methane having two aliphatic and one N-heterocyclic substituent in each aryl ring. For the mol­ecule having the disordered tert-butyl group, the aryl rings make an angle of 115.3 (2)° at the methyl­ene carbon; one aryl ring is aligned at 42.0 (1)° with respect to the N-heterocyclic substituent and the other at 48.7 (1)° with respect to its substituent. The two ordered mol­ecules are disposed about a pseudo center of inversion. The pairs of twist angles in these two mol­ecules differ [52.7 (1) and 61.7 (1)°, and 29.1 (1) and 58.5 (1)°]