2051-24-3Relevant articles and documents
Optimization of Perchlorination Conditions for Some Representative Polychlorinated Biphenyls
Lin, Jia Ming,Hee, Shane S, Que
, p. 2130 - 2134 (1985)
The yield of decachlorobiphenyl (DCB) from representative Aroclors (50 to 6000 ng) using antimony pentachloride as perchlorinating agent was extremely temperature dependent below 236 deg C for a reaction period of 2 h.At 288 deg C, a 35-min reaction period was sufficient to obtain DCB yields >80percent for Aroclors 1016, 1242, 1254, and 1268.The perchlorination process was shown to be first order.The temperature dependence of the reaction times below 236 deg C was largely responsible for the inconsistent perchlorination yields reported previously in the literature.The extraction of DCB with hexane form a HCl-acidified perchlorinated solution and the subsequent column chromatography on silica gel were also essential after the perchlorination to quantitate the DCB by (63)Ni electron capture/gas chromatography.The structures of the two nonachlorobiphenyls, which were the penultimate stable intermediates before DCB, were found.The methodology to use the technique for air and blood samples was described.
Electrophilic phosphonium cations (EPCs) with perchlorinated-aryl substituents: Towards air-stable phosphorus-based Lewis acid catalysts
Postle, Shawn,Podgorny, Vitali,Stephan, Douglas W.
, p. 14651 - 14657 (2016/10/03)
A series of phosphines incorporating (C6Cl5) substituents, Ph2P(C6Cl5) 1, PhP(C6Cl5)22, P(C6Cl5)33 and (C6F5)P(C6Cl5)24 were prepared. In the case of 1, 2 and 4, these were converted to the corresponding aryl-difluorophosphoranes 5-7via reaction with XeF2, whereas reaction of 3 with XeF2 afforded only an inseparable mixture of products. The compounds 5-7 were converted to the fluorophosphonium cations 8-10, whereas the reaction of 3 with Selectfluor afforded (C6Cl5)2POF and (C6Cl5)2. The fluorophosphonium salts showed evidence of improved air stability as well as Lewis acid catalytic activity in hydrodefluorination, hydrosilylation, deoxygenation and dehydrocoupling chemistry.
Effects of oxygen on formation of PCB and PCDD/F on extracted fly ash in the presence of carbon and cupric salt
Pekarek,Grabic,Marklund,Puncochar,Ullrich
, p. 777 - 782 (2007/10/03)
The effect of oxygen-nitrogen atmosphere (N2 + 10%O2, N2 + 1%O2 and 99.999% N2) on the formation of PCB, PCDD and PCDF by the de novo synthetic reactions in the system consisting of extracted fly ash
