Terephthaloyl chloride

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Terephthaloyl chloride
Skeletal formula
Ball-and-stick model of the terephthaloyl chloride molecule
Preferred IUPAC name
Benzene-1,4-dicarbonyl dichloride[1]
Other names
Terephthaloyl dichloride[1]
1,4-Benzenedicarbonyl chloride
Benzene-1,4-dicarbonyl chloride
Terephthalic acid dichloride
Terephthaloyl dichloride
p-Phthalyl chloride
3D model (JSmol)
ECHA InfoCard 100.002.572
Molar mass 203.02 g/mol
Density 1.34 g/cm3
Melting point 81.5 to 83 °C (178.7 to 181.4 °F; 354.6 to 356.1 K)
Boiling point 265 °C (509 °F; 538 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Terephthaloyl chloride (TCL, 1,4-benzenedicarbonyl chloride) is the acid chloride of terephthalic acid and is one of two monomers used to make Kevlar(R), the other being p-phenylenediamine.

TCL is used as a key component in performance polymers and aramid fibers, where it imparts flame resistance, chemical resistance, temperature stability, light weight, and very high strength. TCL is also an effective water scavenger, used to stabilize isocyanates and urethane prepolymers.


TCL is a white crystalline solid at room temperature, soluble in common organic solvents, its melting point is 81.5-83 °C, its boiling point is 265 °C. It is corrosive.


Terephthalic acid dichloride can be obtained by chlorination of dimethyl terephthalate.[2]


TCL is used for making various copolymers and aramid polymers such as Heracron, Twaron and Kevlar(R):

The reaction of 1,4-phenyl-diamine (para-phenylenediamine) with terephthaloyl chloride yielding Kevlar(R)


  1. ^ a b Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 797. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4.
  2. ^ EP 0095698, Walter Böckmann, Friedrich Brühne, Karl-August Lipper, "Verfahren zur Herstellung von Terephthalsäure- und Isophthalsäuredichlorid" 

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