o-Phthalic anhydride - ≥99% , CAS No.85-44-9

CAS: 85-44-9 Cat. No.: P1372019 Molecular Weight: 148.12 Beilstein Registry Number: 118515 EC Number: 201-607-5
AVAILABLE TO ORDER
GRADE & PURITY ≥99%
Synonyms
CHEBI:36605 | PHTHALIC ANHYDRIDE | Wiltrol P | 1,3-DIOXOPHTHALANE | Anidride ftalica | pthalic anhydride | RCRA waste number U190 | STL194302 | HSDB 4012 | Phthalic anhydride treated gelatin | Phthalic anhydride, ACS reagent, >=99% | 2-Benzofuran-1,3-dion
Storage
Room temperature,Argon charged
Shipped In
FedEx DG Service
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Size
Status
Price
Qty
100g
P1372019-100g
8-12 wks(?) Production requires sourcing of materials. We appreciate your patience and understanding.
$9.90
500g
P1372019-500g
8-12 wks(?) Production requires sourcing of materials. We appreciate your patience and understanding.
$17.90
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Why this grade

≥99% for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature,Argon charged Ships FedEx DG Service Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 13 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Overview

Phthalic anhydride is an industrially important chemical. It can be prepared from o-xylene or naphthalene. It is widely used for the industrial preparation of plasticizers for PVC (polyvinyl chloride).Phthalic anhydride can be synthesized via oxidation of o-xylene, in the presence of V2O5/TiO2 monolithic catalyst supported by aluminium honeycomb.

Specifications

Synonyms
CHEBI:36605 | PHTHALIC ANHYDRIDE | Wiltrol P | 1, 3-DIOXOPHTHALANE | Anidride ftalica | pthalic anhydride | RCRA waste number U190 | STL194302 | HSDB 4012 | Phthalic anhydride treated gelatin | Phthalic anhydride, ACS reagent, >=99% | 2-Benzofuran-1, 3-dion
Specifications & Purity
≥99%
Storage
Room temperature, Argon charged
Shipped In
FedEx DG Service
This product requires cold chain shipping. Ground and other economy services are not available.
Purity
≥99%
Names and Identifiers
Pubchem Sid488180164
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/488180164
Canonical SmilesC1=CC=C2C(=C1)C(=O)OC2=O
IUPAC Name2-benzofuran-1,3-dione
InChIKeyLGRFSURHDFAFJT-UHFFFAOYSA-N
INCHI1S/C8H4O3/c9-7-5-3-1-2-4-6(5)8(10)11-7/h1-4H
Isomeric SMILES C1=CC=C2C(=C1)C(=O)OC2=O
WGK Germany 1
RTECS TI3150000
UN Number 2214
Packing Group III
Molecular Weight 148.12
Beilstein 118515
Reaxy-Rn 118515
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=118515&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

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✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

Quick-reference summary of product specifications and applications.

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

View spec sheet →

Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassOrganoheterocyclic compounds
ClassBenzofurans
SubclassBenzofuranones
Intermediate Tree Nodes Not available
Direct ParentPhthalic anhydrides
Alternative Parents Isobenzofuranones  Dicarboxylic acids and derivatives  Benzenoids  Carboxylic acid anhydrides  Oxacyclic compounds  Organooxygen compounds  Organic oxides  Hydrocarbon derivatives  
Molecular FrameworkAromatic heteropolycyclic compounds
Substituents Phthalic anhydride - Phthalic_anhydride - Isobenzofuranone - Isocoumaran - Benzenoid - Dicarboxylic acid or derivatives - Carboxylic acid anhydride - Oxacycle - Carboxylic acid derivative - Organic oxygen compound - Organic oxide - Hydrocarbon derivative - Organooxygen compound - Aromatic heteropolycyclic compound
DescriptionThis compound belongs to the class of organic compounds known as phthalic anhydrides. These are compounds containing a phthalic anhydride moiety (or a derivative thereof), which consists of a benzene fused to a furan-1,3-dione.
External Descriptors 2-benzofurans - cyclic dicarboxylic anhydride
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

19 results found

Lot NumberCertificate TypeDateItem
F2602453Certificate of AnalysisJun 11, 2026 P1372019
F2602452Certificate of AnalysisJun 11, 2026 P1372019
C2619402Certificate of AnalysisMar 21, 2026 P1372019
C2619396Certificate of AnalysisMar 21, 2026 P1372019
C2619403Certificate of AnalysisMar 21, 2026 P1372019
C2602093Certificate of AnalysisMar 05, 2026 P1372019
C2602091Certificate of AnalysisMar 04, 2026 P1372019
C2602092Certificate of AnalysisMar 04, 2026 P1372019
A2613539Certificate of AnalysisJan 15, 2026 P1372019
A2613556Certificate of AnalysisJan 15, 2026 P1372019
A2613536Certificate of AnalysisJan 15, 2026 P1372019
K2512036Certificate of AnalysisNov 15, 2025 P1372019
K2512038Certificate of AnalysisNov 15, 2025 P1372019
G2530320Certificate of AnalysisAug 07, 2025 P1372019
G2530321Certificate of AnalysisAug 07, 2025 P1372019
G2530462Certificate of AnalysisAug 07, 2025 P1372019
G2530511Certificate of AnalysisAug 07, 2025 P1372019
I2503089Certificate of AnalysisAug 07, 2025 P1372019
J2511027Certificate of AnalysisAug 07, 2025 P1372019

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Chemical and Physical Properties
SolubilitySoluble in water, carbon disulfide, ethanol, acetone and benzene. Slightly soluble in ethyl ether
SensitivityMoisture sensitive.
Flash Point(°F)305.6 °F
Flash Point(°C)152 °C
Boil Point(°C)295°C
Melt Point(°C)130.8°C
Molecular Weight148.110 g/mol
XLogP31.300
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count3
Rotatable Bond Count0
Exact Mass148.016 Da
Monoisotopic Mass148.016 Da
Topological Polar Surface Area43.400 Ų
Heavy Atom Count11
Formal Charge0
Complexity187.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count1
Documents & Articles
A Complete Guide to Selecting Epoxy Curing Systems: Amines vs. Anhydrides vs. Latent Curing — with Aladdin’s Recommended Selection Table
Phthaloyl: Its Role in Primary Amine Protection and Practical Considerations for Experimental Selection
Unstabilized Azomethine Ylide Chemistry from a Single Precursor: Acceptor-Controlled Divergence and Patterns of Scaffold Outcomes
Polyetherimide (PEI): Structural Features, Main Properties, and Typical Application Directions
Alkyd Resins: From Oil/Fatty-Acid-Modified Polyesters to Autoxidative Drying — Understanding Their Structure and Film-Formation Mechanism
How Do Isocyanates and Polyols Affect the Performance of Polyurethane Coating Films: Structure, Raw Material Selection, and Performance Design Essentials
When Should You Choose Silicone Resin? Selection Comparison with Epoxy, Acrylic, Polyurethane, Fluororesin, and Other Coating Resins
Understanding Polyester Resins for Coatings: Structure Design, Key Indicators, and Coating Film Performance
Phenolic-Modified Alkyd Resin: Performance Enhancement and Applications in Fast-Drying Industrial Coatings
Cashew Nut Shell Liquid (CNSL): From Cashew Processing By-Product to Reactive Bio-Based Raw Material for Coating Resins
Guide to Common Waterborne Resin Types and Application-Based Selection: How to Choose Acrylics, PUD, Waterborne Epoxy, Waterborne Alkyd, VAE, and Related Chemicals
Mechanisms and Control of Coating Yellowing: From Chromophoric Structure Formation to Source Diagnosis and Formulation Optimization
Resin Polarity in Coating Formulations: From Molecular Structure to Dissolution, Compatibility, Interfacial Interactions, and Formulation Design
Citations of This Product
References
1. Feng Yang, Junru Yao, Liqiang Jin, Wenjun Huyan, Jintang Zhou, Zhengjun Yao, Peijiang Liu, Xuewei Tao.  (2022)  Multifunctional Ti3C2TX MXene/Aramid nanofiber/Polyimide aerogels with efficient thermal insulation and tunable electromagnetic wave absorption performance under thermal environment.  COMPOSITES PART B-ENGINEERING,      [PMID:] [10.1016/j.compositesb.2022.110161]
2. Xin Gao, Baodong Li, Shouwei Jian.  (2022)  Step-scheme CeO2/CaIn2S4 heterostructured photocatalysts for efficient reduction of Cr(Ⅵ) under visible light.  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,      [PMID:] [10.1016/j.colsurfa.2022.129168]
3. Jianping Guan, Jiao Yang, Yue Zhang, Xiaoxue Zhang, Huajuan Deng, Juan Xu, Jinyi Wang, Mao-Sen Yuan.  (2020)  Employing a fluorescent and colorimetric picolyl-functionalized rhodamine for the detection of glyphosate pesticide.  TALANTA,      [PMID:33379052] [10.1016/j.talanta.2020.121834]
4. Qiang Liu, Lei Gao, Xingsong Su, Fei Zhou, Guotao Duan.  (2019)  Interfacial self-assembly of CoPc thin films with their high sensing use as NO2 sensors.  MATERIALS CHEMISTRY AND PHYSICS,      [PMID:] [10.1016/j.matchemphys.2019.05.029]
5. Xing Ruimin, Yang Haitang, Li Shengnan, Yang Jinghe, Zhao Xiaoyu, Wang Qinglong, Liu Shanhu, Liu Xiuhua.  (2016)  A sensitive and reliable rutin electrochemical sensor based on palladium phthalocyanine-MWCNTs-Nafion nanocomposite.  JOURNAL OF SOLID STATE ELECTROCHEMISTRY,  21  (5): (1219-1228).  [PMID:] [10.1007/s10008-016-3447-5]
6. Zhaoyu Cao, Minming Wu, Yunfei Zhao, Lisha Dai, Rong Zeng, Mei Tu, Jianhao Zhao.  (2016)  Bioinspired double-positively charged phosphodicholine-chitosan and zwitterionic phosphorylcholine-chitosan conjugates: The associated water structure, biocompatibility and antibacterial action.  REACTIVE & FUNCTIONAL POLYMERS,      [PMID:] [10.1016/j.reactfunctpolym.2016.03.018]
7. Qinglong Wang, Haiyan Li, Jing-He Yang, Qian Sun, Qiuye Li, Jianjun Yang.  (2016)  Iron phthalocyanine-graphene donor-acceptor hybrids for visible-light-assisted degradation of phenol in the presence of H2O2.  APPLIED CATALYSIS B-ENVIRONMENTAL,      [PMID:] [10.1016/j.apcatb.2016.03.047]
8. Haodong Gu, Li Tian, Qiuqi Zhang, Xiao You, Mengmeng Wang, Shaoming Dong, Jinshan Yang.  (2024)  Biomimetic Leaf-Vein Aerogel for Electromagnetic Wave Absorption and Thermal Superinsulation.  Small,      [PMID:38845523] [10.1002/smll.202402423]
9. Zhaoying Yang, Xinge Wu, Gaowu Qin, Xiangying Meng.  (2025)  FeCo-SN-C dual-site catalyst with high stability and oxygen reduction activity.  INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,      [PMID:] [10.1016/j.ijhydene.2025.03.204]
10. Runhong Zhu, Yunlong Shi, Yi Zhou, Yi Xia, Qin Qi, Xiaojie Liang, Meijuan Kuang, Zhenya Jia, Mengyue Wang, Changjiang Yu.  (2025)  Highly reactive iron/nickel bimetallic biochar composites for highly efficient remediation of Cr(VI).  NEW JOURNAL OF CHEMISTRY,      [PMID:] [10.1039/D5NJ00107B]
11. Yanhao Liu, Shubin Li, Jiang Zhu, Lili Fan, Lu Wang.  (2024)  Rapid preparation of injectable dual-network hydrogels for biomedical applications using UV-triggered sulfhydryl click reactions.  COLLOIDS AND SURFACES B-BIOINTERFACES,      [PMID:39217728] [10.1016/j.colsurfb.2024.114180]
12. Danyan Lin, Xiujie Lin, Hao Li, Hongyuan Huang, Huan Yang, Jie Yang, Baowei Hu, Fengfeng Chen, Xinrong Guo, Xiangke Wang, Wen Yao.  (2025)  Ultrathin porous nitrogen-doped carbon nanosheets with rich defects for efficient Cr(VI) reduction.  APPLIED CATALYSIS B-ENVIRONMENTAL,      [PMID:] [10.1016/j.apcatb.2025.125174]
13. Tao Zhang, Yusong Xu, Jingya Dai, Xianming Zhang.  (2025)  Epoxidized soybean oil-based waterborne polyurethane coated polyethylene terephthalate fabrics with high flame-retardant, self-healing and wash-resistant properties.  PROGRESS IN ORGANIC COATINGS,      [PMID:] [10.1016/j.porgcoat.2025.109315]
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