| abstract |
PURPOSE: α-Acetylcinnamic acid ester derivatives of formula I(R is alkyl; X 1 is halogen or alkoxyl; X 2 and X 4 are H, halogen, alkoxyl or nitro; X 3 is H, halogen or alkoxyl; where X 2-4 are not H at the same time, at least one of X 1-4 is halogen, when X 1 is halogen and X 2-3 are H, X 4 is not halogen), e.g. trans-α-acetyl-2,5-dichlorocinnamic acid ethylester. n COPYRIGHT: (C)1978,JPO&Japio |