ESTIMATION OF HYDROCARBON SOLUBILITIES IN HYDROFLUOROCARBONS

A new solubility parameter, SP, for hydrofluorocarbons (BFCs) has been developed (SP=1.175 ln(np)+0.025H-0.063F-0.028alpha-0.018beta where n p depends on the molar volume and the molar refractivity; H and F are the number of hydrogens and fluorines, respectively, in the molecule; and a and 8 are the respective numbers of H-C-F and H-C-C-F connection s). Values of SP have been used to predict if an HFC would be a good s olvent for various hydrocarbons at 25-degrees-C. Within an isomeric HF C family, the individual HFCs having the greatest solvency for hydroca rbons were those having the maximum separation of fluorines from hydro gens. Hildebrand solubility parameters, 45, are compared with the semi -empirical SP values. Syntheses for 10 new compounds are given: 3,3,4, 4,5,5,6,6,7,7-decafluorononane, 2-tetrafluoro-2-(trifluo-romethyl)-3-m ethylbutane, 1,1,1,2,2-pentafluoro-3-methylbutane, 1,1,1,2,2,3,3,4,4-n onafluoro-5-methylhexane, 1,1,1,2,2,3,3,4,4-nonafluoroheptane, 1,1,1,2 -tetrafluoro-2-(trifluoromethyl)butane, 1,1,1-trifluoro-3-(trifluorome thyl)butane, 1,1,1,2,2,3,3,5-octafluorohexane, 1,1,1,2,2-pentahydroper fluorooctane and 1,1,1,2,2-pentahydroperfluorodecane.