It has been determined that haloforms (CHCl₃, CHBr₃), chemo-  and regioselectively  are added  to double bond of allylpropargyl ester in the presence of catalytic amounts of sulphuric acid with forming the propargyl esters of β-trihalogenmethylpropanols. Unlike of chlorine analog  the acetylene tribromoester easily is hidrolized by 2% water solution of NaHCO₃, transforming into acetylene esteracid