the reaction mixture was refluxed and volatile products collected in the cold trap as previously described starting material 0 65 grams 96 purity was collected from the reaction vessel by washing the contents with 10 sulfuric acid followed by water the contents of the cold trap were recondensed as described in example 1 to yield 4 83 g of a mixture of hexafluoropropane 90 pentafluoropropene 8 2h octafluoroisobutyl methyl ether 2 as determined by gc analysis a residue 0 75 g from the recondensation was a mixture of hexafluoropropane 16 and 2h octafluoroisobutyl methyl ether 78 the yield of the hexafluoropropane pentafluoropropene mixture was 71 based on starting material hexafluoropropane from pfib ethanol adduct pfib was generated by pyrolysis of hexafluoropropene using the procedure described in 34 synthesis of fluoroorganic compounds 34 i l knunyants and jacobson eds springer verlag berlin heidelberg new york tokyo 1985 p 8 the pfib thus generated was immediately quenched by bubbling through ethanol to produce the pfib ethanol adduct the adduct was isolated by washing with water followed by distillation boiling point 89 u00b0 89 u00b0 c gc analysis of this starting material revealed it to be a mixture of 89 2h octafluoroisobutyl ethyl ether and 10 heptafluoroisobutenyl ethyl ether using the procedure of example 1 8 77 g 0 036m of the starting material and 6 75 g 0 067m of triethylamine were stirred at 20 u00b0 c followed by treatment with water the volatile products were isolated as before to yield 4 3 g of crude mixture containing 85 5 hexafluoropropane 4 5 pentafluoropropene and 7 8 2h octafluoroisobutyl ethyl ether as determine by gc after recondensation in another trap the.