A method of converting a first reaction stream comprising at least one pentafluoropropene to a final product stream comprising at least one compound of formula (II): CHX=CZCF3 (II) wherein X and Z are each independently H or F, with the proviso that X and Z are not the same, comprising processing said first reaction stream under conditions effective to convert said at least one pentafluoropropene to at least one compound of formula (II); wherein said conditions are effective to substantially limit the concentration of 3,3,3-trifluoropropene formed in said final product stream to less than 40 parts per million; and wherein said processing step comprises: (a) reacting said at least one pentafluoropropene to obtain a first product stream comprising at least one pentafluoropropane and at least one compound of formula (I): CH2XCHZCF3 (I) wherein X and Z are each independently H or F, with the proviso that X and Z are not the same; (b) separating said at least one compound of formula (I) from said first product stream to obtain a separated product stream and a second reaction stream, wherein said separated product stream comprises a higher weight percent of said at least one compound of formula (I) than said second reaction stream; and (c) reacting said second reaction stream under conditions effective to produce said at least one compound of formula (II). wherein X and Z are each independently H or F, with the proviso that X and Z are not the same, comprising processing said first reaction stream under conditions effective to convert said at least one pentafluoropropene to at least one compound of formula (II); wherein said conditions are effective to substantially limit the concentration of 3,3,3-trifluoropropene formed in said final product stream to less than 40 parts per million; and wherein said processing step comprises: (a) reacting said at least one pentafluoropropene to obtain a first product stream comprising at least one pentafluoropropane and at least one compound of formula (I): CH2XCHZCF3 (I) wherein X and Z are each independently H or F, with the proviso that X and Z are not the same; (b) separating said at least one compound of formula (I) from said first product stream to obtain a separated product stream and a second reaction stream, wherein said separated product stream comprises a higher weight percent of said at least one compound of formula (I) than said second reaction stream; and (c) reacting said second reaction stream under conditions effective to produce said at least one compound of formula (II). (a) reacting said at least one pentafluoropropene to obtain a first product stream comprising at least one pentafluoropropane and at least one compound of formula (I): CH2XCHZCF3 (I) wherein X and Z are each independently H or F, with the proviso that X and Z are not the same; (b) separating said at least one compound of formula (I) from said first product stream to obtain a separated product stream and a second reaction stream, wherein said separated product stream comprises a higher weight percent of said at least one compound of formula (I) than said second reaction stream; and (c) reacting said second reaction stream under conditions effective to produce said at least one compound of formula (II). <EOS>