Synthesis of 2-methoxy-4-(3-oxobutyl)phenyl 2-(p-tolyl)acetate from zingerone and 4-methylphenylacetic acid. The peak at 3.5-4.0ppm has an integration of 5.29 - We believe that part of this is due to the zingerone (excess phenol, impurity in this case). The phenol would also take up a few peaks in the aromatic region, 6.5-7.5ppm.