Device for preventing leakage of rice container meter

摘要

2-benzoyl-3-aminoacrylate derivatives of the following formula I and methods for the preparation of the same. ##STR1## wherein X is a halogen; X.sub.1 and X.sub.2 are independently selected from a halogen and a nitro; and R, R.sub.1 and R.sub.2 each is an alkyl group containing 1 to 4 carbon atoms. The compounds can be used as starting materials to synthesize benzoxazine derivatives, potent antibacterial compounds.