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643-79-8

Basic Information
CAS No.: 643-79-8
Name: o-Phthalaldehyde
Molecular Structure:
Molecular Structure of 643-79-8 (o-Phthalaldehyde)
Formula: C8H6O2
Molecular Weight: 134.13
Synonyms: 1,2-Benzenedicarboxaldehyde;Phthalic dialdehyde;Phtalaldehydes [French];Phthalic aldehyde;o-Phthaldialdehyde;Phthalyldicarboxaldehyde;Benzene-1,2-dicarboxaldehyde;2-Phthalaldehyde;o-Phthaladlehyde;Phthalic dicarboxaldehyde;
EINECS: 211-402-2
Density: 1.189 g/cm3
Melting Point: 55-58 °C(lit.)
Boiling Point: 266.1 °C at 760 mmHg
Flash Point: 98.5 °C
Solubility: Soluble in water
Appearance: Light yellow powder
Hazard Symbols: ToxicT, IrritantXi, DangerousN
Risk Codes: 36/37/38-43-34-25-50
Safety: 26-28-36-45-36/37/39-61-37/39
Transport Information: UN2923 8/PG 2
PSA: 34.14000
LogP: 1.31160
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    Product name:o-Phthalaldehyde Synonyms: 1,2-Benzenedicarboxaldehyde;OPA;2-Phthalaldehyde CAS number:643-79-8 Molecular formula:C8H6O2 Molecular weight:171.65 Appearance: Yellow crystalline powder Assay:99%min Moisture:0.5%max Meltin

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Chemistry

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.

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.

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.

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.

Consensus Reports

Reported in EPA TSCA Inventory.

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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