Phthalic Anhydride

Name: Phthalic Anhydride
Brand: Vaqora Chemicals
SKU: VQ-013720

About Phthalic Anhydride

Vaqora Chemicals supplies Phthalic Anhydride, a process intermediate or related compound of Fluorescein registered under CAS number 85-44-9. The compound has the formula C8H4O3, corresponding to a molecular weight of 148.11 g/mol. Systematically, it is named 2-benzofuran-1,3-dione. It is also known as 1,3-Isobenzofurandione or 1,2-Benzenedicarboxylic anhydride.

The product is provided as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

Process chemists and analysts use it when developing synthetic routes to Fluorescein, tracking process-related impurities and validating analytical methods. Our customers for this product work in pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. This item is currently in stock for prompt dispatch.

Typical applications

API route development
Impurity fate & purge studies
Analytical method development

Industries

Related to Fluorescein

View every impurity, metabolite and intermediate we list for Fluorescein.

Fluorescein impurities

Specifications & identifiers

Chemical identifiers
Product name	Phthalic Anhydride
Catalogue No.	VQ-013720
CAS Number	85-44-9
IUPAC name	2-benzofuran-1,3-dione
Molecular formula	C₈H₄O₃
Molecular weight	148.11 g/mol
Exact mass	148.016
Grade	Reference Standard
InChIKey	LGRFSURHDFAFJT-UHFFFAOYSA-N
SMILES	C1=CC=C2C(=C1)C(=O)OC2=O
PubChem CID	6811

Physical properties
Physical form	Solid
LogP (XLogP3)	1.3
H-bond donors / acceptors	0 / 3
TPSA	43.4 Å²
Synonyms	1,3-Isobenzofurandione, 1,2-Benzenedicarboxylic anhydride, 1,3-Phthalandione, Araldite HT 901, ESEN, HT 901, Phthalandione, Phthalanhydride, Phthalic acid anhydride, Retarder AK, Retarder B-C, Retarder ESEN

Safety & hazard information (GHS)

Corrosive

Harmful / irritant

Health hazard

Signal word: Danger

Hazard statements

H302Harmful if swallowed
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H335May cause respiratory irritation

Precautionary statements: P233, P260, P261, P264, P264 + P265, P270, P271, P272, P280, P284, P301 + P317, P302 + P352, P304 + P340, P305 + P354 + P338, P317, P319, P321, P330, P332 + P317, P333 + P317, P342 + P316, P362 + P364, P403, P403 + P233

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 85-44-9

ACS / AR

Phthalic anhydride anhydrous, ACS, AR 99.00–100.20%

CAS: 85-44-9
Formula: C₈H₄O₃
MW: 148.11 g/mol

VQ-046839

Synthesis

Phthalic anhydride, 99%

CAS: 85-44-9
Formula: C₈H₄O₃
MW: 148.11 g/mol

VQ-009160

Frequently asked questions

What is the CAS number of Phthalic Anhydride?

The CAS Registry Number of Phthalic Anhydride is 85-44-9. It is also known as 1,3-Isobenzofurandione, 1,2-Benzenedicarboxylic anhydride, 1,3-Phthalandione.

What is the molecular formula and molecular weight of Phthalic Anhydride?

Phthalic Anhydride has the molecular formula C8H4O3 and a molecular weight of 148.11 g/mol. Its IUPAC name is 2-benzofuran-1,3-dione.

What is Phthalic Anhydride used for?

Phthalic Anhydride is supplied as a characterised reference material related to Fluorescein. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of Phthalic Anhydride can I order?

We supply Phthalic Anhydride in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg, 250 mg, 500 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Phthalic Anhydride?

Yes. Every lot of Phthalic Anhydride is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Phthalic Anhydride be shipped internationally?

Yes. Phthalic Anhydride is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.