6-Bromo-1-butylindoline-2,3-dione

There are two independent molecules in the asymmetric unit of the title compound, C12H12BrNO2. The C-C bond lengths of the two carbonyl C atoms of the five-membered rings are distinctly longer than a normal Csp(2)-Csp(2) single bond. One of the molecules makes parallel self-coupled (inversion) dimers by pi-pi interactions with phenyl-phenyl interplanar distances of 3.403 (2) angstrom. The other molecule also forms self-dimers at longer phenyl-phenyl plane distances [3.649 (2) angstrom]. In the crystal, a C-H center dot center dot center dot O interaction is seen.