Tetrachlorophthalic anhydride

An aromatic ester, C8Cl4O3, 285.897 g/mol. Boiling point 371 °C, melting point 255-256.5 °C, as published.

verified recordOrganic — aromatic ester6 measured properties

Identifiers

Molecular formula: C₈Cl₄O₃
Molecular weight: 285.897 g/mol
Exact mass: 283.860155 g/mol
IUPAC name: 4,5,6,7-tetrachloro-2-benzofuran-1,3-dione
SMILES: O=C1OC(=O)c2c(Cl)c(Cl)c(Cl)c(Cl)c21
InChI: InChI=1S/C8Cl4O3/c9-3-1-2(8(14)15-7(1)13)4(10)6(12)5(3)11
InChIKey: AUHHYELHRWCWEZ-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: 700 °F at 760 mmHg (sublimes) (NTP, 1992)measured · CAMEO Chemicals; 371 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Melting Point: 491 to 494 °F (NTP, 1992)measured · CAMEO Chemicals; 255-256.5 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Density: 1.49 at 527 °F (NTP, 1992) - Denser than water; will sinkmeasured · CAMEO Chemicals
Solubility: less than 1 mg/mL at 70 °F (NTP, 1992)measured · CAMEO Chemicals; SLIGHTLY SOLUBLE IN ETHERmeasured · Hazardous Substances Data Bank (HSDB)
LogP: 3.09measured · SangsterLogP
Flash Point: 362 °C c.c.measured · ILO-WHO International Chemical Safety Cards (ICSCs)

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 285.9 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 285.857205 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: 3.8calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 43.4 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 291calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 0calculated · reference compound database
H-bond acceptors: 3calculated · reference compound database
logP: 3.6108calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 43.37 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 0calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 3calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 0calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 56.228 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.3165calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

Cl Chlorine4 atoms · 49.6% by mass
C Carbon8 atoms · 33.6% by mass
O Oxygen3 atoms · 16.8% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 15
Total atoms, hydrogen included: 15
Rings: 2
Aromatic rings: 1
Stereocentres: 0
Formal charge: 0

Functional groups

Ester
A carbonyl bonded to an oxygen that links to another carbon.
Ether
An oxygen bridging two carbons.
Halide (C–X)
A halogen atom attached to carbon.
Aromatic ring
A flat six-membered ring with delocalised electrons.

Matched by structural pattern, not by a measurement.

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.

Reactions it appears in

No documented reaction with a written procedure and a source involves Tetrachlorophthalic anhydride yet.

Other names for it

The systematic name on this record is 4,5,6,7-tetrachloro-2-benzofuran-1,3-dione.

The sources also call it Niagathal, Tetrathal, 1,3-Isobenzofurandione, 4,5,6,7-tetrachloro-, 4,5,6,7-Tetrachloro-1,3-isobenzofurandione, 4,5,6,7-Tetrachloro-2-benzofuran-1,3-dione, Phthalic anhydride, tetrachloro-, 1,3-Dioxy-4,5,6,7-tetrachloroisobenzofuran, NCI-C61585, DTXSID7026102, tetrachlorophthalic acid anhydride, 76GLW0LBEK.

Structurally related

Nothing structurally close to Tetrachlorophthalic anhydride has a page here yet.

Where these values came from

reference compound database8326
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.