ChemicalBook CAS DataBase List 507-09-5

507-09-5

Name	Thioacetic acid
CAS	507-09-5
EINECS(EC#)	208-063-8
Molecular Formula	C2H4OS
MDL Number	MFCD00004853
Molecular Weight	76.12
MOL File	507-09-5.mol

Chemical Properties

Appearance	colourless fuming liquid with an unpleasant odour
Melting point	-17 °C
Boiling point	97 °C
density	1.065 g/mL at 25 °C(lit.)
vapor pressure	1 hPa (20 °C)
FEMA	4210 \| THIOACETIC ACID
refractive index	n20/D 1.465(lit.)
Fp	52 °F
storage temp.	Refrigerator
solubility	27g/l (slow decomposition)
form	Liquid
pka	3.33(at 25℃)
color	Clear colorless to pale yellow
Odor	at 0.01 % in propylene glycol. cooked roasted meaty burnt
PH	1.8 (100g/l, H2O, 20℃)Hydrolysis
Stability:	Stable. Flammable. Incompatible with metals, strong oxidizing agents.
biological source	synthetic
Odor Type	meaty
Water Solubility	27 g/L (15 ºC) (hydrolyse)
JECFA Number	1676
Merck	14,9320
BRN	773684
Dielectric constant	13.0（20℃）
InChI	1S/C2H4OS/c1-2(3)4/h1H3,(H,3,4)
InChIKey	DUYAAUVXQSMXQP-UHFFFAOYSA-N
SMILES	CC(S)=O
LogP	0.14
Uses	Chemical reagent, lachrymator. less more
CAS DataBase Reference	507-09-5(CAS DataBase Reference)
NIST Chemistry Reference	Ethanethioic acid(507-09-5)
EPA Substance Registry System	507-09-5(EPA Substance)

Safety Data

Symbol(GHS)	GHS02,GHS05,GHS06
Signal word	Danger
Hazard statements	H225-H301-H317-H318-H332
Precautionary statements	P210-P280-P301+P310-P303+P361+P353-P304+P340+P312-P305+P351+P338
Hazard Codes	F,C
Risk Statements	R11:Highly Flammable. R34:Causes burns. R22:Harmful if swallowed. less more
Safety Statements	S9:Keep container in a well-ventilated place . S16:Keep away from sources of ignition-No smoking . S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . less more
RIDADR	UN 2436 3/PG 2
WGK Germany	3
RTECS	AJ5600000
F	13-19
TSCA	Yes
REACH Registrations	Active
HazardClass	3
PackingGroup	II
HS Code	29309070
Storage Class	3 - Flammable liquids
Hazard Classifications	Acute Tox. 3 Oral Acute Tox. 4 Inhalation Eye Dam. 1 Flam. Liq. 2 Skin Sens. 1
Safety Profile	Poison by intraperitoneal route. A very dangerous fire hazard when exposed to heat or flame. When heated to decomposition it emits toxic fumes of SOx. See also SULFIDES and MERCAPTANS. less more
Toxicity	LD50 orally in Rabbit: 200 - 350 mg/kg less more

Raw materials And Preparation Products

Hazard Information

General Description

A clear,yellow liquid with a strong, unpleasant odor. May be toxic by ingestion, inhalation and skin absorption. Irritating to skin and eyes. Flash point near 50°F. Used to make other chemicals.

Reactivity Profile

THIOACETIC ACID(507-09-5) is a thio 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.

Air & Water Reactions

Highly flammable. Water soluble.

Health Hazard

May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Definition

ChEBI: A thioacetic acid that is acetic acid in which the oxygen atom of the hydroxy group has been replaced by a sulfur atom.

Hazard

Toxic by ingestion and inhalation; strong irritant to eyes and skin.

Flammability and Explosibility

Highlyflammable

Material Safety Data Sheet(MSDS)

Questions And Answer

Chemical properties
Thioacetic acid is acid containing thiol group, it is also known as thioacetate, thiol acetic acid, acetic acid. It is yellow fuming liquid with unpleasant and pungent odor, chemical property is active, reactivity is very strong, it can prapare mercaptan by reaction with unsaturated aliphatic hydrocarbon and alcohol.
CH3COSH + CH2 = CHCH3 → CH3CH2CH2SH
CH3COSH + CH3CH2OH → CH3CH2SH
Reaction with ethylene oxide can prepare acetylthio ethanol.
CH3COSH + (CH2) 2O → CH3COSCH2CH2OH
Four methods of laboratory prepared thioacetic acid:
1, acetic acid and phosphorus pentasulfide at 91℃ react, vacuum distillation is further refined and product can obtain.
5CH3COOH + P2S5 → CH3COSHC2H4OS + P2O5
2, chloride and hydrogen sulfide react, after dilute lye neutralizes and distillation refines. It can be obtained.
3, the reaction of acetic anhydride with hydrogen sulfide, thioacetic acid can be obtained, while byproduct of acetic acid can get.
4, the reaction of ketene with hydrogen sulfide can directly obtain.
Uses: In laboratory, it can instead of hydrogen sulfide, it can be used verification of cobalt and lead, determination of molybdenum, sulfur synthetic aldehydes and ketones sulfur, histochemical determination of esterase, it can be used as tear gas and so on.;
Uses
1. This product can be used as organic synthesis acetylthio agent and mercapto agent, it is mainly used for lipoic acid, cystine and synthetic mercapto carboxylic acids, it can also be used for hormone antidote, cephalosporins sex and fungicides, modifiers and additives for synthetic polymers. For reagents, flavors and fragrances, cosmetics, synthetic captopril.
2. It can be used as pharmaceuticals, flavors and fragrances intermediates.
3. It can be used as chemical reagent, precipitation agent and catalyst.;
Production methods
It can be obtained by thermal distillation of ice aldehyde acid with five-thiodipropionic phosphorus. Finely powdered phosphorus pentasulfide is added into glacial acetic acid. When heated to 91℃, it start distilles thioacetic acid, it need to prevent bumping during heating, distillation temperature must not exceed 100 ℃. Distillate distilles once again can derive product.;
Hazards & Safety Information
Category: corrosive materials
Toxicity grading: highly toxic Acute intraperitoneal toxicity-mouse LD50: 75 mg/kg
Flammability Combustible hazardous characteristics: it is combustible, easy to decompose into acetic acid and toxic hydrogen sulfide gas
Storage characteristics: Treasury ventilation low-temperature drying; and it should be stored separately with oxidants, alkali.
Extinguishant: sand, foam, water spray, carbon dioxide.;

Spectrum Detail

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