Oxazolinone derivatives, process for preparing the same, and use of the same

A process for preparing an oxazolinone derivative compound represented by the following formula I:

• ##STR11## wherein, R represents a lower alkyl group or a phenyl group containing halogen, lower alkyl or trifluoromethyl group;
• X represents halogen atom, carbomethoxy group, nitro group, or halogen or trifluoromethyl-substituted phenoxy group, being the same or different from one another;
• A represents nitrogen or carbon atom;
• and
• n is an integer of 1 to 3, comprising the steps of:
• condensating an .alpha.-amino acid represented by the following formula II:
• ##STR12## wherein R represents a lower alkyl group or a pheny group containing halogen, lower alkyl or trifluoromethyl group, with an acid chloride represented by the following formula III:
• ##STR13## wherein X represents halogen atom, carbomethoxy group, nitro group, or halogen or trifluoromethyl-substituted phenoxy group, being the same or different from one another, to give an acyl .alpha.-amino acid represented by the following formula IV:
• ##STR14## wherein, R is as defined above, A represents nitrogen or carbon atom, and n is an integer of 1 to 3;
• reacting the acyl .alpha.-amino acid with anhydrous acetic acid;
• and
• dehydrating the resulting adduct.

A composition comprising an herbicidally effective amount of a compound of formula I:

• ##STR15## wherein, R represents a lower alkyl group or a phenyl group containing halogen, lower alkyl or trifluoromethyl group;
• X represents halogen atom, carbomethoxy group, nitro group, or halogen or trifluoromethyl-substituted phenoxy group, being the same or different from one another;
• A represents nitrogen or carbon atom;
• and
• n is an integer of 1 to 3, in combination with an herbicidel carrier.