Preparation method of iso-octyl p-methoxycinnamate

The invention discloses a preparation method of iso-octyl p-methoxycinnamate. The iso-octyl p-methoxycinnamate is used as a raw material. The preparation method comprises the following steps: uniformly mixing p-methoxybenzaldehyde and methyl acetate, adding sodium methoxide, strontium hydroxide and magnesium oxide, carrying out a heating reaction at 40-50 DEG C for 5-6 h, heating to 60-70 DEG C, carrying out a reaction for 3-4 h, filtering, adding an acid into a filtrate to adjust the pH value to 12-14, adding isooctyl alcohol, carrying out a heating reaction at 95-105 DEG C for 4-5 h, maintaining the original temperature, gradually reducing the pressure to 14-16 kPa, continuing the reaction for 1-2 h, and cooling to room temperature to obtain the product. Washing, collecting an organic phase, and performing reduced pressure distillation to obtain a product. According to the preparation method disclosed by the invention, a one-pot method is adopted, each step of reaction is completed by sequentially adding ma