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Methyl oxalyl chloride, 97% - CAS 5781-53-3 - Formula C3H3ClO3


Certificate of Analysis

Methyl oxalyl chloride, 97%

CAS: 5781-53-3 MDL: MFCD00000705  EINECS: 227-307-4
UN#:UN2920Hazard Class:8Packing Group:II
Alternate Name: Methyl chloroglyoxylate


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Chemical Properties

Formula: C3H3ClO3  Density: 1.332
Formula weight: 122.51  Refractive Index: 1.4190
Boiling point: 115-118° Sensitivity: Moisture Sensitive
Flash point: 46°(114°F) 

Literature References

A useful synthesis of isocyanates has been described involving oxidation of monoamides of oxalic acid (prepared from methyl oxalyl chloride and a primary amine) with peroxydisulfate catalyzed by Ag and Cu salts: J. Org. Chem., 60, 5430 (1995):

For other examples of reactions of monoesters of oxalyl chloride, see Ethyl­ oxalyl­ chloride, A14653.

Other References

Beilstein: 1071541
UN#: UN2920
Harmonized Tariff Code:   2917.19

GHS Hazard and Precautionary Statements

Hazard Statements : H301-H314-H318-H226

Toxic if swallowed. Causes severe skin burns and eye damage. Causes serious eye damage. Flammable liquid and vapour.

Precautionary Statements : P210-P301+P310-P303+P361+P353-P305+P351+P338-P405-P501A

Keep away from heat/sparks/open flames/hot surfaces. - No smoking. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.


Risk & Safety

Risk Phrases: 10-14-22-34
Flammable. Reacts violently with water. Harmful if swallowed. Causes burns.
Safety Phrases: 26-36/37/39-45
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).
Harmful Corrosive