Remarkable effect of metal fluoride catalyst on reaction of hexafluoropropene, sulfur and vinyl ethers. Convenient synthesis of 2,2-bis(trifluoromethyl)-4-R-thietanes, 3,3-bis(trifluoromethyl)-5-R-1,2-dithiolanes and 2,2-bis(trifluoromethyl)-4-R-1,3-dithiolanes
作者:Viacheslav A. Petrov、Will Marshall
DOI:10.1016/j.jfluchem.2010.06.011
日期:2010.11
It was demonstrated that the outcome of the reaction of hexafluoropropene, sulfur and vinyl ether strongly depends on the catalyst and reaction conditions. The reaction of HFP and Sx leading to the formation of 2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithietane (1) when it is catalyzed by CsF, proceeds under milder conditions and is easier to control compared to KF catalyzed process. The order of addition
已证明六氟丙烯,硫和乙烯基醚的反应结果在很大程度上取决于催化剂和反应条件。HFP和S x的反应在被CsF催化时会导致形成2,2,4,4-四(三氟甲基)-1,3-二硫杂环丁烷(1),在较温和的条件下进行且较易于控制以KF催化的过程。试剂的添加顺序对反应的结果至关重要。例如,将乙烯基醚添加到1的预生成溶液中在DMF溶剂中的反应缓慢,从而导致相应的2,2-双(三氟甲基)-4-R-硫杂环丁烷的产率为8-91%,并且可以通过KF或CsF进行催化。在MF催化剂存在下,将第二摩尔硫磺添加到2,2-双(三氟甲基)-4-R-硫杂环丁烷的溶液中会导致硫磺插入硫杂环丁烷环中,并形成相应的环状二硫化物-3,3 -双(三氟甲基)-5-R-1,2-二硫杂环丁烷。另一方面,在CsF催化剂存在下,将第二摩尔硫添加到1在DMF中的溶液中,然后添加乙烯基醚导致放热反应,并产生相应的2,2-双(三氟甲基) -4-烷氧基-1,3-二硫杂环戊烷收率好。