2-methyl-2-propanethiol
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | 2-methyl-2-propanethiol | |||||||||||||||
other names |
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Molecular formula | (CH 3 ) 3 CSH | |||||||||||||||
Brief description |
colorless liquid with an unpleasant odor |
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properties | ||||||||||||||||
Molar mass | 90.19 g mol −1 | |||||||||||||||
Physical state |
liquid |
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density |
0.83 g cm −3 (20 ° C) |
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Melting point |
−0.5 ° C / 1 ° C |
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boiling point |
62-65 ° C / 64 ° C |
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Vapor pressure |
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solubility |
heavy in water (4.2 g l −1 at 25 ° C) |
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Refractive index |
1.423 (20 ° C) |
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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 |
2-methyl-2-propanethiol is a chemical compound belonging to the group of thiols . The highly flammable liquid is lighter than water and can form explosive mixtures with air.
properties
Chemical properties
2-methyl-2-propanethiol reacted with metal alkoxides and carboxylic acid chlorides to thiol esters :
Safety-related parameters
2-methyl-2-propanethiol forms highly flammable vapor-air mixtures. The compound has a flash point of −26 ° C. The explosion range is between 1.3% by volume (50 g / m 3 ) as the lower explosion limit (LEL) and 8.7% by volume (327 g / m 3 ) as the upper explosion limit (UEL). The limit gap width was determined to be 1.09 mm. This results in an assignment to explosion group IIA. The ignition temperature is 253 ° C. The substance therefore falls into temperature class T3.
use
Because of the odor that can be perceived even in the smallest doses (0.33 ppb), 2-methyl-2-propanethiol is used as an odorant for otherwise odorless flammable gases.
Individual evidence
- ↑ a b c d e f g h i j k l m n o p q Entry on 2-methyl-2-propanethiol in the GESTIS substance database of the IFA , accessed on July 10, 2019(JavaScript required) .
- ↑ a b c data sheet 2-methyl-2-propanethiol, 99% from Sigma-Aldrich , accessed on February 27, 2014 ( PDF ).
- ↑ Spessard, Gary O .; Chan, Wan Kit; Masamune, S .: Preparation of thiol esters: s-tert-butyl cyclohexanecarbothioate and s-tert-butyl 3α, 7α, 12α-trihydroxy-5β-cholane-24-thioate In: Organic Syntheses . 61, 1983, p. 48, doi : 10.15227 / orgsyn.061.0048 ; Coll. Vol. 7, 1990, p. 87 ( PDF ).
- ↑ a b E. Brandes, W. Möller: Safety-related parameters. Volume 1: Flammable Liquids and Gases. Wirtschaftsverlag NW - Verlag für neue Wissenschaft, Bremerhaven 2003.
- ↑ Devos, M .; Patte, F .; Rouault, J .; Lafort, P .; Van Gemert, LJ: Standardized Human Olfactory Thresholds . IRL Press at Oxford University Press, Oxford 1990, ISBN 0199631468 , p. 118.
- ↑ tert-butyl mercaptan. Chevron Phillips Chemical , accessed July 28, 2016 .