1-[3-(Naphthalen-1-yl)phen-yl]naphthal-ene.

The title compound, C(26)H(18), consists of a benzene ring with meta-substituted 1-naphthalene substituents, which are essentially planar (r.m.s. deviation = 0.039 and 0.027 Å). The conformation is mixed syn/anti, with equivalent torsion angles about the benzene-naphthalene bonds of 121.46 (11) and 51.58 (14)°.

2-[3-(Naphthalen-2-yl)phen-yl]naph-thal-ene.

The title compound, C(26)H(18), consists of a benzene ring with meta-substituted 2-naphthalene substituents, which are essentially planar [r.m.s. deviations = 0.022 (1) and 0.003 (1) Å]. The conformation is syn, with equivalent torsion angles about the benzene-naphthalene bonds of -36.04 (13) and +34.14 (13)°. The mol-ecule has quasi-C(s) mol-ecular symmetry.

(5RS,10SR,15RS)-Trimethyl-truxene.

The title mol-ecule, C(30)H(24), was prepared as a possible precursor to buckminsterfullerene cages. The two enanti-omers adopt the anti configuration, with one S/R and two R/S methyl groups, one anti to the other two. The truxene framework is slightly non-planar: with respect to the central six-ring mean plane, the three methyl C atoms are 1.377 (3), -1.475 (3) and 1.515 (3) Šdistant, whereas the respective proximate peripheral six-ring mean planes make dihedral angles of 6.27 (6), 3.45 (7) and -7.37 (7)°.

(5SR,10SR,15SR)-Trimethyl 5H,10H,15H-diindeno-[1,2-a:1',2'-c]fluorene-5,10,15-tricarboxyl-ate 0.167-hydrate.

The title compound, C(33)H(24)O(6)·0.17H(2)O, which is commonly known as (SR,SR,SR)-trimethyl 1,10,19-truxentricarboxyl-ate, crystallizes as a hydrate with the water mol-ecule encapsulated between three ester groups by O-H⋯O hydrogen bonding to two of them. The water mol-ecule site is not fully occupied in the crystal studied, with a refined site occupancy of 0.167 (5). The 27-atom ring system is approximately planar, with a maximum deviation of 0.148 (1) Å, and the three ester substituents are all on the same side of this plane.