A vic-dichloro-fluorinated alkene of the formula: R1-CCl=CCl-R2, and a fluorinated alkane of the formula: R1-CR3R4-CR5R6-R2, wherein each of R1 and R2 independently represents a perfluoroalkyl group or both of R1 and R2 form together a perfluoroalkylene group, and R3, R4, R5 and R6 independently represent hydrogen or fluorine, are produced from an inexpensive raw material. More specifically, hexachlorocyclopentadiene is reacted with gaseous chlorine using an antimony catalyst, and then the reaction product is reacted with hydrogen fluoride to give 1,2-dichlorohexafluorocyclopentene. Thus-obtained compound is either (i) hydrogenated, or (ii) treated with a fluorinating agent to substitute the chlorine atoms by fluorine atoms, and then hydrogenated, to give the intended fluorinated alkane.
式中的沧二
氯氟化烯:R1-CCl=CCll-R2,以及式中的
氟化
烷烃:R1-CR3R4-CR5R6-R2,其中 R1 和 R2 各自独立地代表
全氟烷基或 R1 和 R2 共同形成
全氟烯基,R3、R4、R5 和 R6 各自独立地代表氢或
氟。更具体地说,使用
锑催化剂使
六氯环戊二烯与气态
氯反应,然后使反应产物与
氟化氢反应,得到
1,2-二氯六氟环戊烯。这样得到的化合物(i)经过氢化,或(ii)经过
氟化剂处理,用
氟原子代替
氯原子,然后再氢化,就得到了所需的
氟化
烷烃。