Phthalic anhydride
Image:Phthalic anhydride.png
General
Systematic name	?
Other names	Isobenzofuran-1,3-dione
Molecular formula	C8H4O3
SMILES	C1=CC=C2C(=C1)C(=O)OC2=O
Molar mass	148.1 g/mol
Appearance	white solid
CAS number	[85-44-9]
Properties
Density and phase	1.53 g/cm3, solid
Solubility in water	reacts slowly
Melting point	131 °C
Boiling point	284 °C subl.
Structure
Crystal structure	?
Dipole moment	? D
Hazards
MSDS	External MSDS
EU classification	Harmful (Xn)
NFPA 704
R-phrases	R22, R37/38, R41, R42/43
S-phrases	S2, S23, S24/25, S26, S37/39, S46
Flash point	152 °C
RTECS number	TI3150000
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Related compounds	Phthalic acid Phthalimide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Phthalic anhydride is the anhydride of phthalic acid. It dissolves in alcohol and some other organic solvents. IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... The simplified molecular input line entry specification or SMILES is a specification for unambiguously describing the structure of chemical molecules using short ASCII strings. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that this article or section be merged with Solution. ... Water has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid. ... Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... The Earths magnetic field, which is approximately a dipole. ... The debye (symbol: D) is a non-SI and non-CGS unit of electrical dipole moment. ... A material safety data sheet or MSDS is a form containing data regarding the properties of a particular substance. ... Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (as amended) is the main source of European Union law concerning chemical safety. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... R-phrases are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. ... S-phrases are defined in Annex IV of European Union Directive 67/548/EEC: Safety advice concerning dangerous substances and preparations. ... The flash point of a fuel is the lowest temperature at which it can form an ignitable mix with air. ... RTECS, also known as Registry of Toxic Effects of Chemical Substances, is a database of toxicity information compiled from the open scientific literature that is available for charge. ... The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed relative to vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Mass spectrometry is an analytical technique to measure the mass-to-charge ratio (m/q) of ions. ... Phthalic acid, or benzene-1,2-dicarboxylic acid, is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... In chemistry, an anhydride is a compound that can be considered as derived from another compound by subtracting the atoms of water. ... Phthalic acid, or benzene-1,2-dicarboxylic acid, is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. ...

Phthalic anhydride is obtained either by catalytic oxidation of ortho-xylene with O₂ (oxygen) or by catalytic oxidation of naphthalene. The most fundamental reactions in chemistry are the redox processes. ... The term xylenes refers to a group of 3 benzene derivatives which encompasses ortho-, meta-, and para- isomers of dimethyl benzene. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Chalcogens Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... Naphthalene (also known as naphthalin, naphthaline, tar camphor, white tar, albocarbon, or naphthene) is a crystalline, aromatic, white, solid hydrocarbon, best known as the primary ingredient of mothballs. ...

It is hydrolyzed by hot water, forming ortho-phthalic acid. Hydrolysis is a chemical process in which a molecule is split into two parts by the addition of a molecule of water. ...

Phthalic anhydride is widely used in industry in the production of dyes (rhodamine, anthraquinone derivatives), insecticides, plasticizers, in pharmacy, in analytic chemistry, etc. A dye can generally be described as a coloured substance that has an affinity to the substrate to which it is being applied. ... Rhodamine is a family of related chemical compounds. ... Anthraquinone (9,10-dioxoanthracene) is an aromatic organic compound whose structure is shown to the right. ... An insecticide is a pesticide whose purpose is to kill or to prevent the multiplication of insects. ... Plasticizers are additives that soften the materials (usually a plastic or a concrete mix) they are added to. ...

External links

• International Chemical Safety Card 0315
• NIOSH Pocket Guide to Chemical Hazards
• European Chemicals Bureau