Excited State Reactivity and Molecular Topology Relationships in Chromophorically Substituted Anthracenes. In: Volman DH, Hammond GS, Gollnick K, editors. Advances in Photochemistry. Hoboken: John Wiley & Sons, Inc.; 1990. pp. 139-227. [DOI: 10.1002/9780470133453.ch3]

1-[(Anthracen-9-yl)carbonyl]-2,7-dimethoxynaphthalene: a chain-like structure composed of face-to-face type dimeric molecular aggregates

The asymmetric unit of the title compound contains two independent mol­ecules (A and B). In the crystal, mol­ecules of each conformer make a face-to-face type dimeric mol­ecular aggregate with two pairs of C—H⋯π hydrogen bonds (A) or a pair of (sp²)C—H⋯O hydrogen bonds (B). The dimeric mol­ecular aggregates composed of same conformers are linked to each other into a chain through π–π stacking inter­actions (A) or a pair of C—H⋯π hydrogen bonds (B) along the b axis. The chains are aligned along the c axis by weak van der Waals inter­actions or (sp²)C—H⋯O=O hydrogen bonds, and they are alternately stacked along the a axis.

The asymmetric unit of the title compound, C₂₇H₂₀O₃, contains two independent mol­ecules (A and B). The anthracene ring system is connected to the 2,7-di­meth­oxy­naphthalene core in a twisted manner, with dihedral angles of 86.38 (5) and 79.36 (8)°, respectively, for conformers A and B. In the crystal, face-to-face type dimeric mol­ecular aggregates of each conformer are observed. The dimer of conformer A is formed by two pairs of C—H⋯π inter­actions, and that of conformer B by a pair of (sp²)C—H⋯O hydrogen bonds. The dimers of conformer A are linked to each other via a π–π stacking inter­action between the anthracene rings to form a chain along the b axis and the chains are aligned along the c axis, forming a sheet structure. The dimers of conformer B are connected to each other via a couple of C—H⋯π inter­actions to form a chain along the b axis. The chains are aligned along the c axis through (sp²)C—H⋯O=C hydrogen bonds, forming a sheet parallel to the bc plane. The sheets of conformers A and B are alternately stacked along the a axis via two kinds of inter­molecular (sp²)C—H⋯O=C hydrogen bonds.

Enyne [4 + 4] photocycloaddition with polycyclic aromatics

Polycyclic aromatics undergo [4 + 4] photocycloaddition to give tricyclic polyene products.