ChemicalBook >>L(+)-Ascorbic acid>>L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone(50-81-7)

L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone(50-81-7)

L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone(50-81-7)
Product IdentificationBack to Contents
【Product Name】

L-Threo-2,3,4,5,6-pentahydroxy-1-hexenoic acid-4-lactone
【Synonyms】

3-Oxo-L-gulofuranolactone (enol form)
L-3-Ketothreohexuronic acid lactone
L-Ascorbic acid
L-Xyloascorbic acid
Vitamin C
Vitascorbol
【CAS】

50-81-7
【Formula】

C6H8O6
【Molecular Weight】

176.13
【EINECS】

200-066-2
【RTECS】

CI7650000
【RTECS Class】

Tumorigen; Drug; Mutagen; Reproductive Effector; Human Data
【Merck】

13,837
【Beilstein/Gmelin】

84272
【Beilstein Reference】

5-18-05-00026
Physical and Chemical PropertiesBack to Contents
【Appearance】

White crystals.
【Solubility in water】

330 g/L
【Melting Point】

190 - 192
【Boiling Point】

553
【Vapor Pressure】

2E-14 (25 C)
【Density】

1.694 g/cm3 (20 C)
【pKa/pKb】

4.13 (pKa)
【Partition Coefficient】

-2.11
【Heat Of Vaporization】

148.7 kJ/mol
【Usage】

As antioxidant in foodstuffs, to prevent rancidity, to prevent browning of cut apples & other fruit.
First Aid MeasuresBack to Contents
【Ingestion】

Never give anything by mouth to an unconscious person. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Wash mouth out with water. Get medical aid if irritation or symptoms occur.
【Inhalation】

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
【Skin】

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
【Eyes】

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.
Handling and StorageBack to Contents
【Storage】

Store in a cool, dry, well-ventilated area away from incompatible substances. Do not expose to air. Store protected from light. Store under an inert atmosphere.
【Handling】

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Store protected from light. Handle under an inert atmosphere. Store protected from air.
Hazards IdentificationBack to Contents
【Ingestion】

Ingestion of large amounts may cause gastrointestinal irritation. Low hazard for usual industrial handling. Large doses may cause diarrhea and acidification of the urine which may cause stones in the urinary tract.
【Inhalation】

May cause respiratory tract irritation. Low hazard for usual industrial handling.
【Skin】

May cause skin irritation. Low hazard for usual industrial handling.
【Eyes】

May cause eye irritation.
Exposure Controls/Personal ProtectionBack to Contents
【Personal Protection】

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
【Respirators】

A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
【Poison Class】

-
Fire Fighting MeasuresBack to Contents
【Flash Point】

276
【Autoignition】

380
【Fire Fighting】

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
【Upper exp. limit】

14.5
【Lower exp. limit】

1.7
【Fire Potential】

This material is probably combustible.
Accidental Release MeasuresBack to Contents
【Small spills/leaks】

Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Carefully scoop up and place into appropriate disposal container. Provide ventilation. Place under an inert atmosphere.
Stability and ReactivityBack to Contents
【Incompatibilities】

Oxidizing agents.
【Stability】

Stable at room temperature in closed containers under normal storage and handling conditions.
【Decomposition】

Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.
Transport InformationBack to Contents
【HS Code】

2936 27 00
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