Phthalic Anhydride

C₈H₄O₃

IUPAC: 2-Benzofuran-1,3-dione

CAS: 85-44-9

Overview

Phthalic anhydride is one of the most important industrial organic chemicals, used to make plasticizers, alkyd resins, and dyes.

Composition

Element Symbol Atoms Atomic Mass
Hydrogen H 4 1.0080
Carbon C 8 12.0110
Oxygen O 3 15.9990

Elemental Composition

H
Hydrogen ×4
2.7%
C
Carbon ×8
64.9%
O
Oxygen ×3
32.4%

Uses

  • • Plasticizer production (DOP)
  • • Alkyd resin
  • • Unsaturated polyester
  • • Dye synthesis

Fun Facts

  • ✦ Over 5 million tonnes produced annually worldwide, one of the largest-volume organic chemicals

Safety

  • ⚠ Irritant
  • ⚠ Sensitizer

Structure

SMILES

C1=CC=C2C(=C1)C(=O)OC2=O

Properties

Type
organic
State
solid
Molar Mass
148.12 g/mol
Density
1.5270 g/cm³
Melting Point
131.0 °C
Boiling Point
295.0 °C
Solubility
decomposes

Molecular Descriptors

Exact Mass
148.0160
XLogP
1.3
TPSA
43.4 Ų
H-Bond Donors
0
H-Bond Acceptors
3
Rotatable Bonds
0
Heavy Atoms
11
Complexity
187.0

Related Compounds

1,2-Dichloroethane

C₂H₄Cl₂

1,3-Butadiene

C₄H₆

1,4-Dioxane

C₄H₈O₂

1-Butanol

C₄H₁₀O

2-Propanol

C₃H₈O

Acetaldehyde

CH₃CHO

Acetamide

C₂H₅NO

Acetic Anhydride

C₄H₆O₃

Acetone

(CH₃)₂CO

Acetonitrile

C₂H₃N

Frequently Asked Questions

What is Phthalic Anhydride?
Phthalic Anhydride (C₈H₄O₃) is a organic compound with the IUPAC name 2-Benzofuran-1,3-dione.
What is the molecular weight of Phthalic Anhydride?
Phthalic Anhydride has a molar mass of 148.12 g/mol.
What state is Phthalic Anhydride at room temperature?
Phthalic Anhydride is a solid at room temperature.
Is Phthalic Anhydride organic or inorganic?
Phthalic Anhydride is classified as an organic compound.
What elements make up Phthalic Anhydride?
Phthalic Anhydride (C₈H₄O₃) is composed of Hydrogen (H), Carbon (C), Oxygen (O).