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Hexabromocyclododecane (HBCD) is prepared commercially by bromination of cis,trans,trans-cyclododecatriene (ctt-CDT) and widely used as a flame retardant, particularly in polystyrene foams. Commercial HBCD consists largely of three diastereomers, α-, β-, and γ-HBCD, the structures of which have been known for many years. Recently, the presence in the mixture of small amounts of two minor diastereomers,...
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