Abstract: n-Monoaolyl maleates were prepared by reacting maleic anhydride with methanol,ethanol,npropyl alcohol,n-butyl alcohol,n-pentyl alcohol.n-Monoalkyl fumarates and by isomerization of the corresponding maleates.n-Monoalkylester monochloride was made from thioyl chloride and the corresponding fumarates.n-Monoalkylester monochloride reacted with n-propyl gallate to form fire fmal comop ounds.The reaction tethnology conditions of each process were carefully discussed and studied to find their regularities which would theoretical guidelines to the synthesis of other analogs.

Key words: n-monoalkyl maleate , Fumaric acid monoalkyl ester monochloride , Fumaric acid alkyl 3-PG ester , Technology condition , Regularify