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Oxalyl chloride is mainly used as a catalyst in the oxidation of alcohols to the corresponding aldehydes and ketones. It is actively used for the synthesis of acid chlorides from acids. In the Fridel-Crafts acylation reaction, it reacts with aromatic compounds to get the corresponding acyl choride using aluminum chloride as catalyst. Further, it is utilized to prepare dioxane tetrketone, an oxide of carbon.
Reactive acid chloride which can be used as a phosgene substitute in many reactions.
Caution! Carbon monoxide may be evolved.
Mild reagent for conversion of sensitive acids to acid chlorides; see, e.g.: Org. Synth. Coll., 8, 486 (1993); Org. Synth. Coll., 9, 516 (1998).
Has advantages over POCl3 in the Vilsmeier formylation reaction in that cleaner reactions often occur and a much lower mass of acidic by-product is formed. See N,N-Dimethylformamide, A13547 and (Chloromethylene)dimethylammonium chloride, B24172.
Friedel-Crafts reaction with arenes give carboxylic acids via the acid chlorides; see, e.g.: Org. Synth. Coll., 5, 706 (1973); 7, 420 (1990). For other phosgene equivalents, see Trichloromethyl chloroformate, A17444, and Triphosgene, A14932.
Widely used to activate Dimethyl sulfoxide, A13280, for selective oxidation of alcohols to aldehydes or ketones (Swern oxidation) at low temperatures under very mild conditions: J. Org. Chem., 43, 2480 (1978). The reactive species is thought to be chlorodimethylsulfonium chloride: J. Org. Chem., 44, 4148 (1979). For examples of Swern oxidations, see: Org. Synth. Coll., 7, 258 (1990); 8, 501 (1993); 9, 692 (1998); Org. Synth., 76, 110 (1998). See also Trifluoroacetic anhydride, A13614.
Reaction with Grignards in the presence of LiBr and CuBr provides a route to symmetrical ɑ-diones in good yield: Tetrahedron Lett., 36, 7305 (1995).
For a brief feature on uses of this reagent in Organic synthesis, see: Synlett, 1172 (2007).
Ilangovan, A.; Anandhan, K.; Kaushik, M. P. Facile and selective deprotection of PMB ethers and esters using oxalyl chloride. Tetrahedron Lett. 2015, 56 (9), 1080-1084.
Hansen, S. V.; Ulven, T. Oxalyl Chloride as a Practical Carbon Monoxide Source for Carbonylation Reactions. Org. Lett. 2015, 17 (11), 2832-2835.
Hazard Statements: H302-H331-H314-H318
Harmful if swallowed. Toxic if inhaled. Causes severe skin burns and eye damage. Causes serious eye damage.
Precautionary Statements: P260-P201-P280-P304+P340-P405-P501a
Do not breathe dust/fume/gas/mist/vapours/spray. Obtain special instructions before use. Wear protective gloves/protective clothing/eye protection/face protection. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.