Add time:07/22/2019         Source:sciencedirect.com

The molecular structures of 1-(4-dimethylaminopyridinium)-2-bromo-1,1,2,2-tetrafluoroethane bromide (1-Br) (triclinic, P1̄, a=538.80(10), b=916.6(3), c=1372.8(3) pm, α=81.56(2)°, β=81.76(2)°, γ=82.53(2)°) and 1-(4-dimethylaminopyridinium)-1,1,2,2-tetrafluoroethane bromide (2-Br) (monoclinic, Cm, a=1159.6(2), b=2780.2(6), c=577.90(10) pm, β=95.78(3)°) were determined. The two bromides crystallize with one water molecule per formula unit. In cation 1 a hypervalent ion-pairing Br−…BrCF2CF2N (320.7 pm) was observed. A radical mechanism for the interaction of 4-dimethylaminopyridine with 1,2-dibromo-tetrafluoroethane is proposed.

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