Oxalyl chloride

ReagentPlus®, ≥99%

Ethanedioyl dichloride
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

vapor density

4.4 (vs air)

Quality Level

vapor pressure

150 mmHg ( 20 °C)

product line




reaction suitability

reagent type: oxidant


<10 ppb Heavy metals


APHA: 0-150

refractive index

n20/D 1.429 (lit.)


62-65 °C (lit.)


−10-−8 °C (lit.)


1.5 g/mL at 20 °C (lit.)

SMILES string




InChI key


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General description

Oxalyl chloride is a commonly used chlorinating reagent that can be prepared by the reaction of oxalic acid and phosphorus pentachloride.


Oxalyl chloride may be used in the following processes:
  • Preparation of Mosher′s acid chloride by reacting with Mosher′s acid in the presence of DMF.
  • Activation of dimethyl sulfoxide for use in the oxidation of long-chain alcohols to carbonyls.
  • Activation of α-keto carboxylic acids and N-heterocyclic carboxylic acids for alkynylation to form ynediones and N-heterocyclic ynones, respectively.
Suitable for the synthesis of acid chlorides used to produce liquid crystals.
Reactant involved in:
  • Synthesis of N-heterocyclic ynones and ynediones, used to activate carboxylic acids
  • Chlorination and halogenation
  • Three-component [3+2] cycloadditions
  • Reactions with organostannanes
  • Synthesis of cyclopentenones
  • Carbonylations, used as a carbonyl synthon


5, 25, 100 g in ampule
10 kg in Nowpak™

Legal Information

ReagentPlus is a registered trademark of Sigma-Aldrich Co. LLC

Signal Word


Target Organs

Respiratory system

Supp Hazards

EUH014 - EUH029

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 2922 6.1(8) / PGI

WGK Germany


Flash Point(F)

51.8 °F - closed cup

Flash Point(C)

11.0 °C - closed cup

Catalytic Syntheses of N-Heterocyclic Ynones and Ynediones by In Situ Activation of Carboxylic Acids with Oxalyl Chloride.
Boersch C, et al.
Angewandte Chemie (International Edition in English), 50(44), 10448-10452 (2011)
A simple method for the microscale preparation of Mosher's acid chloride.
Ward DE and Rhee CK.
Tetrahedron Letters, 32(49), 7165-7166 (1991)
Oxidation of long-chain and related alcohols to carbonyls by dimethyl sulfoxide" activated" by oxalyl chloride.
Mancuso AJ, et al.
The Journal of Organic Chemistry, 43(12), 2480-2482 (1978)
Tsutomu Kimura et al.
Chemical communications (Cambridge, England), (32)(32), 4077-4079 (2005-08-11)
Reaction of diastereomerically pure phosphinoselenoic acid salts with oxalyl chloride leads to enantiomerically pure P-chiral phosphinoselenoic chlorides with inversion of configuration at phosphorus; one of these chlorides is converted to a phosphinoselenothioic acid salt with a high degree of enantioselectivity.
Peter J Manley et al.
Organic letters, 4(18), 3127-3129 (2002-08-31)
[reaction: see text] A mild, practical, one-pot method for the generation of imidoyl chlorides and their subsequent in situ reaction with pyridine-1-oxides is described. The imidoyl chlorides were formed from the reaction of secondary amides with a stoichiometric amount of...

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