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EINECS 211-402-2
CAS No. 643-79-8 Density 1.189 g/cm3
Solubility Soluble in water Melting Point 55-58 °C(lit.)
Formula C8H6O2 Boiling Point 266.1 °C at 760 mmHg
Molecular Weight 134.13 Flash Point 98.5 °C
Transport Information UN2923 8/PG 2 Appearance Light yellow powder
Safety 26-28-36-45-36/37/39-61-37/39 Risk Codes 36/37/38-43-34-25-50
Molecular Structure Molecular Structure of 643-79-8 (o-Phthalaldehyde) Hazard Symbols ToxicT, IrritantXi, DangerousN

1,2-Benzenedicarboxaldehyde;Phthalic dialdehyde;Phtalaldehydes [French];Phthalic aldehyde;o-Phthaldialdehyde;Phthalyldicarboxaldehyde;Benzene-1,2-dicarboxaldehyde;2-Phthalaldehyde;o-Phthaladlehyde;Phthalic dicarboxaldehyde;


o-Phthalaldehyde Chemical Properties

Molecular Structure:

Molecular Formula: C8H6O2
Molecular Weight: 134.132
IUPAC Name: Phthalaldehyde
Synonyms of Phthalaldehyde (CAS NO.643-79-8): 4-07-00-02138 (Beilstein Handbook Reference) ; BRN 0878317 ; EINECS 211-402-2 ; NSC 13394 ; Phtalaldehydes ; Phtalaldehydes [French] ; Phthalic aldehyde ; Phthalic dialdehyde ; Phthalyldicarboxaldehyde ; UNII-4P8QP9768A ; o-Phthalaldehyde ; o-Phthaldialdehyde ; 1,2-Benzenedicarboxaldehyde
CAS NO: 643-79-8
Classification Code: Anti-Infective Agents ; Disinfectants ; Enzyme inhibitors ; Indicators and reagents
Melting point: 55-58 °C 
Polar Surface Area: 34.14 Å2
Index of Refraction: 1.622
Molar Refractivity: 39.75 cm3
Molar Volume: 112.7 cm3
Surface Tension: 48.3 dyne/cm
Density: 1.189 g/cm3
Flash Point: 98.5 °C
Enthalpy of Vaporization: 50.41 kJ/mol
Boiling Point: 266.1 °C at 760 mmHg
Vapour Pressure: 0.0088 mmHg at 25°C 
Form: powder
Color: yellow
Water: Solubility soluble
Sensitive: Air Sensitive
Merck: 7368
BRN: 878317
Stability: Stable. Air sensitive. Incompatible with strong oxidizing agents, strong bases.

o-Phthalaldehyde Uses

 Phthalaldehyde (CAS NO.643-79-8) is pharmaceutical intermediate, and it is used in pharmaceutical inspection. It is mainly used in medicine, dyestuff, etc. It is commonly used as a high-level disinfectant for medical instruments.

o-Phthalaldehyde Production

There are two synthesis method of Phthalaldehyde (CAS NO.643-79-8): the first described in 1887 when it was prepared from α,α,α',α’-tetrachloro-ortho-xylene. And the second that hydrolysis of the related tetrabromoxylene using potassium oxalate, followed by purification by steam distillation.

o-Phthalaldehyde Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LDLo unreported 7mg/kg (7mg/kg)   Comptes Rendus Hebdomadaires des Seances, Academie des Sciences. Vol. 246, Pg. 851, 1958.

o-Phthalaldehyde Consensus Reports

Reported in EPA TSCA Inventory.

o-Phthalaldehyde Safety Profile

Poison by an unspecified route. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALDEHYDES.
Hazard Codes of Phthalaldehyde (CAS NO.643-79-8): Xi,T,N
Risk Statements: 36/37/38-43-34-25-50
36/37/38:  Irritating to eyes, respiratory system and skin 
43:  May cause sensitization by skin contact 
34:  Causes burns 
25:  Toxic if swallowed 
50:  Very Toxic to aquatic organisms  
Safety Statements: 26-28-36-45-36/37/39-61-37/39
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36:  Wear suitable protective clothing 
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
36/37/39:  Wear suitable protective clothing, gloves and eye/face protection 
61:  Avoid release to the environment. Refer to special instructions safety data sheet 
37/39:  Wear suitable gloves and eye/face protection 
RIDADR: UN2923 8/PG 2
WGK Germany: 3
RTECS: TH6950000
F: 1-8-10: Sensitive to air and humidity. Photosensitive. Keep under argon.
Hazard Note: Irritant/Air Sensitive
HS Code: 29122900

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