Exposure to
sunlight converts it into
trimesic acid (benzene-1,3,5-tricarboxylic acid). It undergoes
bromination to give dibromoacrylic acid. With
hydrogen chloride it forms chloroacrylic acid. Its
ethyl ester condenses with
hydrazine to form
pyrazolone. It forms a characteristic explosive solid upon treatment to its
aqueous solution with
ammoniacal silver nitrate. An amorphous explosive
precipitate forms with ammoniacal
cuprous chloride. ==Propiolates==