The asymmetric unit of the title compound, C27H27OPS2·0.5C6H6, is composed of a heterocyclic molecule and one half-benzene ring, the solvent molecule being located on a centre of inversion. The 16-membered ring has an irregular −ap, −ap, +sp, +ac, −sc, +ap, −ap, −sc, +ap, −ap, +sc, +sp, −ap, +ap, +sp, −ac conformation. The phospho­rus tetra­hedron exhibits its usual deformation, with C—P—C angles smaller than the usual tetra­hedral value of 109.5° and O—P—C angles greater than this value. In the structure, there is a stacking inter­action between the P-bonded benzene rings. Furthermore, there is a weak inter­molecular C—H⋯O hydrogen bond. In this way, a hydrogen-bonded chain is created along the crystallographic a axis.

The compound demonstrates a unique structure with a stacking interaction between benzene rings and a weak hydrogen bond, creating a hydrogen-bonded chain along the crystallographic a axis.

4‐Phenyl‐14,18‐dithia‐4‐phosphatricyclo[18.4.0.07,12]tetracosa‐2,5‐dien‐4‐one benzene hemisolvate

Key Takeaway: The compound demonstrates a unique structure with a stacking interaction between benzene rings and a weak hydrogen bond, creating a hydrogen-bonded chain along the crystallographic a axis.

4‐Phenyl‐14,18‐dithia‐4‐phosphatricyclo­[18.4.0.07,12]tetra­cosa‐2,5‐dien‐4‐one benzene hemisolvate

Key Takeaway: The compound demonstrates a unique structure with a stacking interaction between benzene rings and a weak hydrogen bond, creating a hydrogen-bonded chain along the crystallographic a axis.

4‐Phenyl‐14,18‐dithia‐4‐phosphatricyclo[18.4.0.07,12]tetracosa‐2,5‐dien‐4‐one benzene hemisolvate