abstract |
A mixture of isomers of the formula C₆F₆ in which at least 80% by mass of the trans isomer of perfluoro-4-methyl-2-pentene and at most 3% by mass of perfluoro-2-methyl-2-pentene is suitable as Cooling and insulating medium and can substitute 1,1,2-trichloro-1,2,2-trifluoroethane. |