3-mercaptopropionic acid
| Structural formula | |||||||||||||||||||
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| General | |||||||||||||||||||
| Surname | 3-mercaptopropionic acid | ||||||||||||||||||
| other names |
3-thiohydracrylic acid |
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| Molecular formula | C 3 H 6 O 2 S | ||||||||||||||||||
| Brief description |
colorless liquid with a rancid odor |
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| properties | |||||||||||||||||||
| Molar mass | 106.15 g mol −1 | ||||||||||||||||||
| Physical state |
liquid |
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| density |
1.22 g cm −3 |
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| Melting point |
17-19 ° C |
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| boiling point |
110 ° C (20 hPa) |
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| Vapor pressure |
0.053 hPa (20 ° C) |
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| solubility |
miscible with water, ethanol, benzene and diethyl ether |
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| Refractive index |
1.4920 (20 ° C) |
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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 | |||||||||||||||||||
3-Mercaptopropionic acid is a chemical compound from the group of substituted thiols and carboxylic acids .
Extraction and presentation
The chemical reaction of beta- propiolactone with sodium hydrogen sulfide produces 3-mercaptopropionic acid. Other industrial synthesis methods are also known. Biotechnological processes can also be used for synthesis.
properties
3-Mercaptopropionic acid is a flammable, hardly inflammable, colorless liquid with a rancid odor that is miscible with water. Its aqueous solution reacts strongly acidic.
use
The use as a stabilizer, antioxidant, catalyst and chemical intermediate is described. The compound is widely used as a flavoring in the food and beverage industry. It is also used in the manufacture of PVC stabilizers, which are used as chain transfer agents in polymerizations. It can be used as a primary or secondary color stabilizer in combination with phenolic antioxidant for polymers. It acts as a sulfide ion equivalent and is used in the manufacture of diaryl sulfide from aryl iodide .
safety instructions
The vapors of 3-mercaptopropionic acid can form an explosive mixture with air ( flash point 93 ° C, ignition temperature 350 ° C).
Individual evidence
- ↑ a b c d e f g h i j k l Entry on 3-mercaptopropionic acid in the GESTIS substance database of the IFA , accessed on December 3, 2018(JavaScript required) .
- ↑ a b c Data sheet 3-Mercaptopropionic acid, 99% from AlfaAesar, accessed on December 3, 2018 ( PDF )(JavaScript required) .
- ↑ a b Entry on 3-mercaptopropionic acid in the Hazardous Substances Data Bank , accessed on December 3, 2018.
- ↑ Google Patents: CN105218421A - Production method of 3-mercaptopropionic acid - Google Patents , accessed December 3, 2018.
- ↑ Kylie D. Allen, Robert H. White, Robert Gunsalus: Occurrence and biosynthesis of 3-mercaptopropionic acid in. In: FEMS Microbiology Letters. 363, 2016, p. Fnw217, doi : 10.1093 / femsle / fnw217 .