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Using the procedure of Reynolds and Hauser, Org. Syn. Coll. Vol 3, a mixture of ethyl 4-[4-(4-trifluoromethylphenoxy)phenoxy]-3-oxopentanoate (1.51 g), benzene (15 ml) and aniline (0.5 g) is azeotropically distilled. The reaction product is purified using a florisil column and eluting with hexane/ethylacetate (9:1) to yield (fractions 2, 3 and 4) ethyl 4-[4-(4-trifluoromethylphenoxy)phenoxy]-3-phenylamino-2-pentenoate.

1. distillationis azeotropically distilled
2. customThe reaction product is purified
3. washeluting with hexane/ethylacetate (9:1)