4-Chlorobutanal Diethyl Acetal is a chemical compound with the molecular formula C8H17ClO2. It is an acetal derivative of chlorobutanal. This is derived from the reaction between chlorobutanal (2-chlorobutanal) and ethanol in the presence of an acid catalyst, resulting in the substitution of the aldehyde hydrogen with an ethoxy group (-OEt). Acetals are formed from aldehydes or ketones and alcohols in the presence of an acid catalyst. 4-Chlorobutanal Diethyl Acetal may be used as an intermediate in organic synthesis for the preparation of various compounds. Its specific applications can vary depending on the desired reaction and target molecule.