Tetrafluorobenzenes
| Tetrafluorobenzenes | |||||
| Surname | 1,2,3,4-tetrafluorobenzene | 1,2,3,5-tetrafluorobenzene | 1,2,4,5-tetrafluorobenzene | ||
| Structural formula |
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| CAS number | 551-62-2 | 2367-82-0 | 327-54-8 | ||
| PubChem | 11084 | 16910 | 9474 | ||
| Molecular formula | C 6 H 2 F 4 | ||||
| Molar mass | 150.07 g mol −1 | ||||
| Physical state | liquid | ||||
| Melting point | −42 ° C | −46.25 ° C | 4 ° C | ||
| boiling point | 95 ° C | 84.4 ° C | 90 ° C | ||
| density | 1.4 g cm −3 (25 ° C) | 1.393 g cm −3 (25 ° C) | 1,344 g cm −3 (25 ° C) | ||
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GHS labeling |
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| H and P phrases | 225-315-319-335 | ||||
| no EUH phrases | |||||
| 210-261-305 + 351 + 338 | |||||
In chemistry, the tetrafluorobenzenes form a group of substances consisting of a benzene ring with four fluorine atoms (–F) as substituents . Their different arrangement results in three constitutional isomers with the empirical formula C 6 H 2 F 4 .
properties
The boiling points of the three isomers are relatively close to one another, while their melting points differ more clearly. Due to its symmetry, 1,2,4,5-tetrafluorobenzene has the highest melting point of 4 ° C.
Individual evidence
- ↑ a b c d data sheet 1,2,3,4-tetrafluorobenzene from Sigma-Aldrich , accessed on April 22, 2017 ( PDF ).
- ↑ a b David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-474.
- ↑ a b c d data sheet 1,2,4,5-tetrafluorobenzene from Sigma-Aldrich , accessed on April 22, 2017 ( PDF ).
- ↑ a b data sheet 1,2,3,5-tetrafluorobenzene from Sigma-Aldrich , accessed on April 22, 2017 ( PDF ).