4-(Trifluoromethyl)benzaldehyde is a colorless liquid that has the chemical formula C6H3(CF3)COCH2. It is used as a reagent in organic synthesis. 4-(Trifluoromethyl)benzaldehyde reacts with amines to form acid complexes, which are useful for the production of pharmaceuticals and other chemicals. 4-(Trifluoromethyl)benzaldehyde also reacts with hydrogen chloride to form a salt, which is commonly used in analytical chemistry.