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Terephthaloyl chloride

Terephthaloyl chloride

CAS Number: 100-20-9

Molecular Formula: C8H4Cl2O2

Acylating reagent agrochemicalCAS 100-20-9 wholesaleHigh purity TCL aramidsUN 3261

About Terephthaloyl chloride

Terephthaloyl Chloride (also known as 1,4-Benzenedicarbonyl Dichloride, CAS No. 100-20-9) is a high-purity aromatic diacid chloride used extensively in the manufacture of high-performance polymers, engineering resins, and advanced materials across the United States. As a critical reactive intermediate in the production...

Synonyms

  • 1,4-benzenedicarbonyl dichloride
  • 1,4-phthaloyl dichloride
  • p-phthaloyl dichloride
  • terephthaloyl chloride
  • terephthaloyl dichloride
View all

Terephthaloyl chloride Specifications

CAS Number
100-20-9
Molecular Formula
C8H4Cl2O2
Molecular Weight
203.02
IUPAC Name
benzene-1,4-dicarbonyl chloride
Canonical SMILES
C1=CC(=CC=C1C(=O)Cl)C(=O)Cl
InChI Key
LXEJRKJRKIFVNY-UHFFFAOYSA-N
InChI
1S/C8H4Cl2O2/c9-7(11)5-1-2-6(4-3-5)8(10)12/h1-4H
EINECS Number
202-829-5
MDL Number
MFCD00000693
HSN No
291739
Melting point
82-84 °C
Boiling point
259 °C
Density
1.32 g/cm³
logP
0.88 (calculated)
Molecular Weight
203.02
Physical Hazards
Corrosive to Metals (Cat 1)
Health Hazards
Skin Corrosion (Cat 1B); Serious Eye Damage (Cat 1); STOT SE (Cat3) (Respiratory Irritation)
Precautionary Statement Codes
P260, P261, P264, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P363, P403+P233, P405, and P501

High-Performance Polymers & Engineering Plastics

Terephthaloyl Chloride is widely used by U.S. polymer and materials manufacturers in the production of high-performance polyamides, polyesters, and specialty resins. These materials are essential in aerospace, automotive, and industrial equipment manufacturing, where high thermal resistance, dimensional stability, and mechanical strength are required.

Water Treatment & Filtration Membranes

TCL is a key reactive intermediate in the manufacturing of thin-film composite (TFC) membranes used for reverse osmosis (RO) and nanofiltration. It facilitates the interfacial polymerization process that creates the ultra-thin, selective salt-rejection layer of the membrane.

Specialty Coatings & Specialty Chemicals

Beyond bulk polymers, Terephthaloyl Chloride is used in the synthesis of specialty coatings, adhesives, and high-performance pigments. Its dual-functional acid chloride groups allow for precise cross-linking, enhancing the durability and weather resistance of industrial coatings.

Electronics & Electrical Insulation Materials

Terephthaloyl Chloride-derived polymers are used in electrical insulation films, circuit protection materials, and high-temperature components in electronics manufacturing. These materials meet stringent performance and reliability requirements for U.S.-based electronics and semiconductor applications.

Atmospheric Shielding

Storage under a Dry Nitrogen Blanket is mandatory to prevent moisture-induced degradation and pressure buildup from HCl gas release

Temperature Requirements

Store in a cool, dry area (< 30°C). If supplied as a fused solid, heating for discharge must be controlled to prevent thermal decomposition

Containment

Use moisture-proof, polyethylene-lined steel drums or specialized ISO tanks for bulk liquid (molten) transport

Incompatibilities

Keep away from water, alcohols, strong bases, and amines (with which it reacts violently to form polyamides)

  1. 1,4-benzenedicarbonyl dichloride
  2. 1,4-phthaloyl dichloride
  3. p-phthaloyl dichloride
  4. terephthaloyl chloride
  5. terephthaloyl dichloride

Terephthaloyl chloride FAQs

Minimum Order Quantity

25 kg (evaluation) · 1 MT (commercial)

Lead Time

3 – 5 weeks estimated

Delivery Terms

FOB*

Packaging

20 L pails, 200 L HDPE drums, 1000 L IBC

US Availability

US Facility Inventory

Documentation

US SDS · COA · TDS · Specification sheet

US Regulatory & Quality Information

TSCA status*

US SDS / HazCom*

GHS classification*

ISO 9001:2015 site*

DOT shipping classification*

FDA status*

EPA status*

California Prop 65*

Reliable US supply chain

Regulatory compliance

On-time delivery

Technical expert support

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