The title compound, C60H50Cl2Si5, was obtained by a ring-opening reaction of decaphenylcyclopentasilane. The chain of silicon atoms adopts an all trans conformation [Si—Si—Si—Si torsion angles = −156.31 (5) and −161.02 (5)°]. One of the Cl atoms is in an antiperiplanar conformation with respect to the Si chain [Cl—Si—Si—Si = −156.40 (5)°] while the other Cl substituent adopts a synclinal conformation [Si—Si—Si—Cl = 78.82 (6)°].
