Benzotrifluoride
Structural formula | |||||||||||||||||||
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General | |||||||||||||||||||
Surname | Benzotrifluoride | ||||||||||||||||||
other names |
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Molecular formula | C 7 H 5 F 3 | ||||||||||||||||||
Brief description |
colorless, highly flammable liquid |
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properties | |||||||||||||||||||
Molar mass | 146.11 g mol −1 | ||||||||||||||||||
Physical state |
liquid |
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density |
1.2 g cm −3 |
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Melting point |
−29 ° C |
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boiling point |
102 ° C |
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Vapor pressure |
40 h Pa (20 ° C) |
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solubility |
very heavy in water (0.45 g l −1 at 20 ° C, hydrolysis) |
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Refractive index |
1.413-1.415 |
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safety instructions | |||||||||||||||||||
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Toxicological data | |||||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
Benzotrifluoride is a chemical compound from the group of aromatic fluorocarbons . It is a colorless, volatile, highly flammable and almost odorless liquid.
Extraction and presentation
Benzotrifluoride can be made by fluorinating benzotrichloride .
properties
Physical Properties
Benzotrifluoride is a colorless, highly flammable liquid that is very poorly soluble in water. The boiling point under normal pressure is 102.3 ° C. According to Antoine, the vapor pressure function results according to log 10 (P) = A− (B / (T + C)) (P in Torr, T in K) with A = 6.642, B = 1148.7 and C = −70.9 in the temperature range from 2 to 80 ° C. The compound has a calorific value of 4.6 kWh / kg. Benzotrifluoride vapors are five times as heavy as air.
It reacts with hot water, producing hydrogen fluoride and benzoic acid .
use
Benzotrifluoride is used as a starting material for the production of herbicides , dyes and pharmaceuticals, such as the intermediate m -chlorobenzotrifluoride C 7 H 4 ClF 3 and benzotrifluoride isocyanates . It is still used as a solvent .
safety instructions
Benzotrifluoride vapors form an explosive mixture with air ( flash point 12 ° C, ignition temperature 620 ° C).
Individual evidence
- ↑ a b Benzotrifluoride data sheet (PDF) from Merck , accessed on February 27, 2010.
- ↑ a b c d e f g h Entry on alpha, alpha, alpha-trifluorotoluene in the GESTIS substance database of the IFA , accessed on February 22, 2017(JavaScript required) .
- ↑ entry to benzotrifluoride at ChemBlink , accessed on February 25 2011th
- ↑ Entry on α, α, α-trifluorotoluene in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
- ↑ a b Field, FH; Saylor, JH: The Vapor Pressures of Some Organic Fluorides in J. Am. Chem. Soc. 68 (1946) 2649-2650.
- ↑ List of calorific values (PDF; 15 kB), accessed on August 13, 2012