1,1,2,2,3-Pentafluoropropane 25–26[135][2] Dimethoxyborane 25.9 1,4-Pentadiene 25.9 2-Bromo-1,1,1-trifluoroethane 26 1,2-Difluoroethane 26 Hydrogen cyanide 26 1,H-Pentafluorocyclobut-1-ene[122] 1,H:2,H-hexafluorocyclobutane[122] Tetramethylsilane 26.7 Chlorosyl trifluoride 27 2,2-Dichloro-1,1,1-trifluoroethane 27.8 Perfluoroethyl 2,2,2-trifluoroethyl ether 27.89 Perfluoroethyl ethyl ether 28 perfluorocyclopentadiene C5F6 28°[136] 2-Butyne 29 Digermane 29 Perfluoroisopropyl methyl ether 29 Trifluoromethanesulfonyl chloride 29–32[137] Perfluoropentane 29.2 Rhenium(VI) fluoride 33.8 Chlorodimethylsilane 34.7 1,2-Difluoropropane 43 1,3-Difluoropropane 40-42 Dimethylarsine 36 Spiro[2.2]pentane 39 Ruthenium(VIII) oxide 40 Nickel carbonyl 42.1 Trimethylphosphine 43