5 Chloromethylfurfural

5-Chloromethylfurfural is an organic compound with the formula C₄H₂O(CH₂Cl)CHO. It consists of a furan substituted at the 2- and 5-positions with formyl (CHO) and chloromethyl (CH₂Cl) groups. CMF, as it is called, is obtained by dehydration of fructose and other cellulose derivatives using hydrochloric acid. It is a colourless liquid. It can be reduced to give 5-methylfurfural, and can be hydrolyzed to give hydroxymethylfurfural.