4-溴-3,4,4-三氟-3-三氟甲基-1-丁烯的合成研究

Synthesis of 4-Bromo-3,4,4-trifluoro-3-trifluoromethyl-1-butene

可用于氟聚合物共聚改性的单体4-溴-3,4,4-三氟-3-三氟甲基-1-丁烯,由六氟丙烯溴化后与乙烯反应,再脱除溴化氢制得。其结构经红外、气相色谱分析得以确认。研究了合成过程中每一步反应的最佳条件,得出溴化六氟丙烷与乙烯反应的最佳反应条件:反应温度为100℃,反应压力为0.2 MPa,反应时间8 h;1,4-二溴-3,4,4-三氟-3-三氟甲基-1-丁烷脱除溴化氢的最适宜反应温度为80℃。

The 4-bromo-3,4,4-trifluoro-3-trifluoromethyl-1-butene can be prepared by the bromination of hexafluoropropylene,then the brominated product suffered the addition of ethylene,and dehydrobromination.This compound can be used for modification of fluoropolymer for its active double carbon bond and bromine.The structure of 4-bromo-3,4,4-trifluoro-3-trifluoromethyl-1-butene was confirmed by FT-IR,gas chromatograph.The optimum reaction conditions of each step in the synthesis process were studied experimentally.The results showed that the optimum reaction conditions of the addition of ethylene to bromided hexafluoropropane was:the reaction temperature was 100℃,the reaction pressure was 0.2 MPa,and the reaction time was 8 h.The optimum reaction temperature for the removal of hydrogen bromide from 1,4-dibromo-3,4,4-trifluoro-3-trifluoromethyl-1-butane was 80℃.