2-Mercaptopropionsäure

Bezeichnung:2-Mercaptopropionsäure

CAS-Nr79-42-5

Englisch Name:2-Mercaptopropionic acid

CBNumberCB0239767

SummenformelC3H6O2S

Molgewicht106.14

MOL-Datei79-42-5.mol

Synonyma

2-Mercaptopropionsure

2-Mercaptopropionsäure

2-Mercaptopropionsäure physikalisch-chemischer Eigenschaften

Schmelzpunkt	10-14 °C (lit.)
Siedepunkt	102 °C/16 mmHg (lit.) 203-208 °C (lit.)
Dichte	1.196 g/mL at 25 °C (lit.)
Dampfdruck	1.7 hPa (20 °C)
FEMA	3180 \| 2-MERCAPTOPROPIONIC ACID
Brechungsindex	n20/D 1.481(lit.)
Flammpunkt	190 °F
storage temp.	2-8°C
Löslichkeit	1g/L in organic solvents at 20 ℃
Aggregatzustand	Liquid
pka	pK1:4.32(0);pK2:10.20(SH) (25°C)
Farbe	Clear colorless to slightly yellow
PH	2 (H2O, 20℃)(undiluted)
Geruch (Odor)	at 0.01 % in propylene glycol. meaty sulfurous roasted
Geruchsart	sulfurous
Wasserlöslichkeit	MISCIBLE
JECFA Number	551
Merck	14,9340
BRN	506218
InChIKey	PMNLUUOXGOOLSP-UHFFFAOYSA-N
LogP	1.15 at 20℃
CAS Datenbank	79-42-5(CAS DataBase Reference)
NIST chemische Informationen	2-Mercaptopropanoic acid(79-42-5)
EPA chemische Informationen	Propanoic acid, 2-mercapto- (79-42-5)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	34-22
S-Sätze:	26-36/37/39-45-25
RIDADR	UN 2936 6.1/PG 2
WGK Germany	1
RTECS-Nr.	UF5250000
TSCA	Yes
HazardClass	6.1
PackingGroup	II
HS Code	29309070
Toxizität	LD50 orally in Rabbit: 730 mg/kg

Gefahreninformationscode (GHS)

2-Mercaptopropionic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R34:Verursacht Verätzungen.
R22:Gesundheitsschädlich beim Verschlucken.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S25:Berührung mit den Augen vermeiden.
Chemische Eigenschaften
Clear colorless to slightly yellow liquid. Oily liquid; Melting point 10 ℃; Boiling point d-95 ~ 100 ℃ / 2133Pa, dl- 98.5 ~ 99.0 ℃ / 1866Pa; Density I-D19.24 1.193; Refractive index dl-nD: 1.4823; Optical rotation[α] D-45.47; soluble in water, ethanol and ether.
Chemische Eigenschaften
Thiolactic acid has a roasted, meaty odor.
Verwenden
Depilatory, hair-waving preparations.
Verwenden
Thiolactic acid (TLA) can be used as a building block in the synthesis of:
- Thiolactomycin via oxathiolanone intermediate.
- 4-Thiazolidinones by reacting various Schiff bases with thioglycolic acid.
- 1,4-Naphthoquinone derivatives containing sulfur atom for antibacterial and antiviral activity studies.
It can also be used as a bidental chelating agent for the surface modification of titanium dioxide (TiO₂) nanoparticles for the removal of cadmium from waste water.
Definition
ChEBI: 2-mercaptopropanoic acid is a mercaptopropanoic acid.
synthetische
By electrolysis of the corresponding sulfide, S(SCHMeCO2H)2.
Taste threshold values
Taste characteristics at 15 ppm: meaty, sulfury, brothy, and brown.
Allgemeine Beschreibung
An oily liquid with an unpleasant odor. Toxic by ingestion and skin absorption. Used as a depilatory and in hair waving preparations.
Air & Water Reaktionen
Soluble in water and denser than water.
Reaktivität anzeigen
2-Mercaptopropionic acid is an organosulfide/organic acid. Organosulfides are incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. Many of these compounds may liberate hydrogen sulfide upon decomposition or reaction with an acid. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in 2-Mercaptopropionic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions.
Health Hazard
TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Brandgefahr
Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
Sicherheitsprofil
Poison by ingestion. Moderately toxic by inhalation. When heated to decomposition it emits toxic fumes of SOx. See also SULFIDES and MERCAPTANS.

2-Mercaptopropionic acid Upstream-Materialien And Downstream Produkte

2-Mercaptopropionsäure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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