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Description

o-Phthalic dicarboxaldehyde · CAS 25750-62-3 · C8H6O2. UNII 4P8QP9768A. Boiling Point: BP: 83 °C at 0.8 mm Hg; Melting Point: 55.8 °C; Flash Point: 132 °C (270 °F) - closed cup.

Identification

CAS Registry Number	25750-62-3
PubChem CID	4807
Molecular formula	C8H6O2
IUPAC name	phthalaldehyde
UNII (FDA)	4P8QP9768A

Computed Descriptors

Molecular Weight	134.13
XLogP3	1.2
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	2
Exact Mass	134.036779430
Monoisotopic Mass	134.036779430
Topological Polar Surface Area	34.1
Heavy Atom Count	10
Formal Charge	0

Physical & Chemical Properties

Boiling Point	BP: 83 °C at 0.8 mm Hg
Melting Point	55.8 °C
Flash Point	132 °C (270 °F) - closed cup
Flash Point	132 °C c.c.
Solubility	In water, 5 g/100 mL at 20 °C
Density	Density (at 20 °C): 1.13 g/cm³
Vapor Pressure	0.0052 [mmHg]
Vapor Pressure	0.0052 mm Hg at 21 °C (0.69 Pa)
LogP	log Kow = 0.51
LogP	0.99 (30 °C)

Physical description & handling notes

• Pale yellow or colorless solid; [Merck Index] Yellow powder or lumps; [Alfa Aesar MSDS]
• YELLOW SOLID IN VARIOUS FORMS WITH CHARACTERISTIC ODOUR.
• Long, pale yellow needles from petroleum ether (MP 56-56.5 °C). Also reported as colorless powder (MP: 54 °C)
• Yellow needles or crystals from ligroin
• Very soluble in ethyl ether, ethanol
• Solubility in water, g/100ml at 20 °C: 3.8 (soluble)

GHS Hazard Classification

Reported hazard statements	H228 (44.3%), H301 (97.9%), H314 (74%), H315 (26%), H317 (97.4%), H318 (73.6%), H335 (28.1%), H373 (44.3%)

Documented Uses

• Used as a disinfectant and in the fluorometric determination of primary amines and thiols; [Merck Index] Used to sterilize medical and dental equipment, as an enzyme inhibitor, indicator, chemical intermediate, diagnostic agent, tanning agent for leather, in water treatment, pulp and paper manufacturing, oil field water flooding, hair colorings, wood treatment, and antifouling paints; [NTP]
• Petroleum Production and Refining [Category: Industry]
• Pulp and Paper Processing [Category: Industry]
• Painting (Pigments, Binders, and Biocides) [Category: Paint]
• Applying Wood Preservatives [Category: Other]
• Using Disinfectants or Biocides [Category: Clean]

Synonyms

o-Phthalaldehyde; 643-79-8; PHTHALALDEHYDE; o-Phthaldialdehyde; 1,2-Benzenedicarboxaldehyde; Phthalic aldehyde; ortho-Phthalaldehyde; benzene-1,2-dicarbaldehyde; Phthalic dialdehyde; Phthalic dicarboxaldehyde; Phthalyldicarboxaldehyde; Phthalaldialdehyde; ortho Phthalaldehyde; o-Phthalicdicarboxaldehyde; 1,2-Diformylbenzene; phtharal

Frequently Asked Questions

What are the CAS number and molecular formula of o-Phthalic dicarboxaldehyde?

CAS 25750-62-3; molecular formula C8H6O2; molecular weight — g/mol.

What other names is o-Phthalic dicarboxaldehyde known by?

o-Phthalaldehyde, 643-79-8, PHTHALALDEHYDE, o-Phthaldialdehyde, 1,2-Benzenedicarboxaldehyde, Phthalic aldehyde.

Is o-Phthalic dicarboxaldehyde classified as hazardous?

Hazard statements reported: H228, H301, H314, H315, H317.

What are the key physical properties of o-Phthalic dicarboxaldehyde?

Boiling Point: BP: 83 °C at 0.8 mm Hg; Melting Point: 55.8 °C; Flash Point: 132 °C (270 °F) - closed cup; Flash Point: 132 °C c.c..

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.