Preparation and X-ray structural characterization of further stereoisomers of 1,2,5,6,9,10-hexabromocyclododecane

► Synthesis of five minor isomers of 1,2,5,6,9,10-hexabromocyclododecane (HBCD). ► New isomers were characterized by NMR and X-ray structure determinations. ► Isomers were named zeta-, eta-, theta-, iota-, and kappa-HBCD. ► An X-ray crystal structure determination on the epsilon isomer was completed. ► Crystal structures for all 10 HBCD diastereomers are now available.