Dichloromethyl methyl ether (HCl2COCH3) is an organic compound that belongs to the class of ethers with a dichloromethyl group and a methyl group.

It can be synthesized from methyl formate and a mixture of phosphorus pentachloride and phosphorus oxychloride[1] or by chlorination of chlorodimethyl ether.

The compound is used in the formylation of aromatic compounds (Rieche formylation) and as a chlorination agent in the formation of acid chlorides.

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