Abstract: Methyl 4 propylnitrilephenol was synthesized via Friedel Crafts reaction of o cresol with acrylonitrile in the presence of anhydrous aluminium chloride. The condensed product was hydrolyzed in a mixture of methanol and sulfuric acid medium to afford the title compound. Mass spectrometric and 1H NMR spectral data of the product and its intermediates were given. The effects of different volume of anhydrous alunimium chloride on the Friedel Crafts reaction and different medium on hydrolysis reaction were discussed.