| 1 | 661-00-7 | Hexanoyl chloride, 6-fluoro- | C6H10ClFO | 152.59 | | |
| 2 | 661-08-5 | 5-Nitrouracil | | | | |
| 3 | 661-11-0 | 1-FLUOROHEPTANE | C7H15F | 118.19 | -73°C | |
| 4 | 661-18-7 | Thiocyanic acid 5-fluoropentyl ester | C6H10FNS | 147.21 | | |
| 5 | 661-19-8 | 1-Docosanol | C22H46O | 326.6 | 65-72°C(lit.) | Insoluble |
| 6 | 661-20-1 | Cyanate | CNO- | 42.02 | | |
| 7 | 661-34-7 | 5-Aminoquinoline | | | | |
| 8 | 661-36-9 | tetramethylammonium tetrafluoroborate | C4H12BF4N | 160.95 | ≥300°C(lit.) | Solubility in hot water is almost transparent. |
| 9 | 661-37-0 | fluoro-trimethyl-germane | C3H9FGe | 136.74 | | |
| 10 | 661-38-1 | Sulfur, trichloromethyl-, (T-4)- (9CI) | CH3Cl3S | 153.46 | | |
| 11 | 661-42-7 | Phosphorane, difluorotrimethyl- | C3H9F2P | 114.07 | | |
| 12 | 661-46-1 | Antimony, dibromotris(trifluoromethyl)- (8CI) | C3Br2F9Sb | 488.586 | | |
| 13 | 661-53-0 | 2-FLUORO-2-METHYLBUTANE | C5H11F | 90.14 | -121°C | |
| 14 | 661-54-1 | 3,3,3-TRIFLUOROPROPYNE | C3HF3 | 94.04 | | |
| 15 | 661-62-1 | (Dimethylamino)fluorodimethylsilane | C4H12FNSi | 121.23 | | |
| 16 | 661-66-5 | 1,1-Dichloro-2-Iodo-1,2,2-Trifluoroethane | C2Cl2F3I | 278.83 | | |
| 17 | 661-68-7 | Disilane, 1,2-difluoro-1,1,2,2-tetramethyl- | C4H12F2Si2 | 154.31 | | |
| 18 | 661-69-8 | Hexamethylditin | C6H18Sn2 | 327.63 | 23-24 °C (lit.) | Not miscible or difficult to mix in water. |
| 19 | 661-71-2 | 1-Chloro-1,2,2-Trifluorocyclobutane | C4H4ClF3 | 144.52 | | |
| 20 | 661-75-6 | Ethane, 1,1,1-trichloro-2,2-difluoro-2-methoxy- | C3H3Cl3F2O | 199.41 | | |
| 21 | 661-78-9 | 2-Butanone, 4,4,4-trifluoro-3-hydroxy-3-methyl- | C5H7F3O2 | 156.1 | | |
| 22 | 661-81-4 | Propanoic acid, 3,3,3-trichloro-2,2-difluoro- | C3HCl3F2O2 | 213.39 | | |
| 23 | 661-82-5 | 3-chloro-2,2,3,3-tetrafluoropropanoic acid | C3HClF4O2 | 180.49 | | |
| 24 | 661-83-6 | Propane, 3-bromo-3-chloro-1,1,1,2,2-pentafluoro- | C3HBrClF5 | 247.39 | | |
| 25 | 661-93-8 | 1,2-DIBROMO-2-CHLOROPENTAFLUOROPROPANE | C3Br2ClF5 | 326.29 | | |
| 26 | 661-95-0 | 1,2-dibromo-1,1,2,3,3,3-hexafluoropropane | C3Br2F6 | 309.83 | -95 °C | |
| 27 | 661-96-1 | 1,1,1,2,2,3-Hexachloro-3,3-difluoropropane | C3Cl6F2 | 286.75 | 50.85°C | |
| 28 | 661-97-2 | 1,2-DICHLOROHEXAFLUOROPROPANE | C3Cl2F6 | 220.93 | -124.9°C | |