Synthesis of the two minor isomers, δ- and ε-1,2,5,6,9,10-hexabromocyclododecane, present in commercial hexabromocyclododecane
| Autor: | Alan McAlees, Chris Marvin, Alexandre Konstantinov, Nicole Riddell, Gregg T. Tomy, Gilles Arsenault, Robert McCrindle, Gordia MacInnis, Brian Yeo |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Hexabromocyclododecane
Environmental Engineering Molecular Structure Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Diastereomer Stereoisomerism General Medicine General Chemistry Pollution Gas Chromatography-Mass Spectrometry Mass Spectrometry Hydrocarbons Brominated NMR spectra database chemistry.chemical_compound chemistry Liquid chromatography–mass spectrometry Environmental Chemistry Organic chemistry Gas chromatography Gas chromatography–mass spectrometry Enantiomer Chromatography Liquid Flame Retardants Fire retardant |
| Zdroj: | Chemosphere. 68:887-892 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2007.02.005 |
| Popis: | 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, alpha-, beta-, and gamma-HBCD, the structures of which have been known for many years. Recently, the presence in the mixture of small amounts of two minor diastereomers, delta- and epsilon-HBCD, has been reported. Bearing in mind the manner in which commercial HBCD is generated, it was anticipated that these components are probably formed by bromination of trans,trans,trans-cyclododecatriene (ttt-CDT), a common contaminant in commercial ctt-CDT. Indeed, when a sample of ttt-CDT was brominated it gave two products, the NMR spectra and LC/MS and GC/MS behaviour of which confirmed that they are identical to the minor components, delta- and epsilon-HBCD, present in commercial HBCD. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect