biostudies-literature00450Unknown68(Pt 4)Isobe HA racemic mixture of the title compound, C(26)H(26)Br(2), a brominated [4]helicene, crystallizes, forming columns of stacked mol-ecules. There are two crystallographically unique mol-ecules in the asymmetric unit, both with the same helical handedness. As is typical with helicene congeners, the unique mol-ecules show short inter-atomic contacts between H atoms at the fjord region, with H?H distances of 1.87 and 1.94?Å. Mol-ecules with the same helical handedness segregate in the crystal packing, forming homochiral columns. The stacked mol-ecules are piled in a column with alternate orientations. The shortest C?C distance in the stacked mol-ecules is 3.306?(4)?Å.Acta crystallographica. Section E, Structure reports onlineo1239https://www.ebi.ac.uk/biostudies/studies/S-EPMC3344169biostudies-literature2,11-Dibromo-5,8-dibut-yl[4]helicene.PMC3344169Hitosugi SNakanishi WMatsuno TIsobe H45false2,11-Dibromo-5,8-dibut-yl[4]helicene.A racemic mixture of the title compound, C(26)H(26)Br(2), a brominated [4]helicene, crystallizes, forming columns of stacked mol-ecules. There are two crystallographically unique mol-ecules in the asymmetric unit, both with the same helical handedness. As is typical with helicene congeners, the unique mol-ecules show short inter-atomic contacts between H atoms at the fjord region, with H?H distances of 1.87 and 1.94?Å. Mol-ecules with the same helical handedness segregate in the crystal packing, forming homochiral columns. The stacked mol-ecules are piled in a column with alternate orientations. The shortest C?C distance in the stacked mol-ecules is 3.306?(4)?Å.2012-01-01T00:00:00Z2012 Apr2021-02-20T17:51:27Z2019-03-27T00:53:04ZS-EPMC33441692260617210.1107/S1600536812013141