Formation of bromodifluoroacetyl fluoride, CF2BrC(O)F, in the thermal gas-phase oxidation of bromotrifluoroethene, CF2CFBr, initiated by trifluoromethylhypofluorite, CF3OF
作者:Joanna Czarnowski
DOI:10.1016/j.jfluchem.2006.02.003
日期:2006.6
reaction is a chain reaction with bromine atoms as chain carriers. Its basic steps are: the thermal generation of CF3O radical by abstraction of fluorine atom from CF3OF, chain initiation by addition of CF3O to the double bond of alkene, leading, in presence of O2, to the formation of bromine atom and chain propagation by the reaction of bromine atom with CF2CFBr, originating CF2BrCFBrO radical. The predominant
CF的氧化2 CFBR通过分子Ó 2,由CF发起3 OF,已经研究了在273,253.5,239和218 K. CF的初始压力3的混合物在0.9和2.4托之间变化,即CF的2 CFBR介于11.5到30.7托之间,O 2介于42.5到100.7托之间。主要产品是CF 2 BrC(O)F(基于消耗的CF 2 CFBr的收率81-95%)。还形成了少量的C(O)F 2和C(O)FBr以及痕量的溴三氟乙烯环氧化物。该反应是以溴原子为链载体的链反应。它的基本步骤是:CF 3的热生成通过从CF 3 OF提取氟原子获得O自由基,通过将CF 3 O加到烯烃的双键上引发链引发,在O 2存在下导致形成溴原子,并通过溴原子的反应使链扩散与CF 2 CFBr一起生成CF 2 BrCFBrO自由基。后者的主要命运是溴原子的挤出,CC键断裂起次要作用。假定完整的机制。