Process for producing fluorinated alkene and fluorinated alkane

A process for producing a fluorinated alkane represented by the following formula:

• R.sup.1 --CH.sub.2 --CH.sub.2 --R.sup.2
• wherein each of R.sup.1 and R.sup.2 independently represents a perfluoroalkyl group or both of R.sup.1 and R.sup.2 form together a perfluoroalkylene group, characterized by the steps of:
• allowing a perchloro-conjugated diene compound to react with chlorine in the presence of an antimony catalyst and in the absence of hydrogen fluoride,
• allowing the thus-prepared reaction product to react with hydrogen fluoride to give a vic-dichlorofluorinated alkene represented by the follow formula :
• R.sup.1 --CCl.dbd.CCl--R.sup.2
• wherein R.sup.1 and R.sup.2 are as defined above, and then
• allowing the vic-dichloro-fluorinated alkene to react with hydrogen in the presence of a hydrogenation catalyst and in the co-presence of a basic compound.

A process for producing a fluorinated alkane represented by the following formula:

• R.sup.1 --CHF--CHF--R.sup.2
• wherein each of R.sup.1 and R.sup.2 independently represents a perfluoroalkyl group or both of R.sup.1 and R.sup.2 form together a perfluoroalkylene group, characterized by the steps of:
• allowing a perchloro-conjugated diene compound to react with chlorine in the presence of an antimony catalyst and in the absence of hydrogen fluoride,
• allowing the thus-prepared reaction product to react with hydrogen fluoride to give a vic-dichloro-fluorinated alkene represented by the following formula:
• R.sup.1 --CCl.dbd.CCl--R.sup.2
• wherein R.sup.1 and R.sup.2 are as defined above,
• allowing the vic-dichloro-fluorinated alkene to react with a fluorinating agent to substitute the chlorine atoms of the vic-dichloro-fluorinated alkene by fluorine atoms, and then
• allowing the thus-prepared fluorinated alkene to react with hydrogen in the presence of a hydrogenation catalyst.