| 摘要 |
1,384506 2,3,5 - Trisubstituted - 6 - trifluoromethyl - 1,3 - diazin - 4 - ones AMERICAN CYANAMID CO 14 March 1973 [24 March 1972] 12284/73 Addition to 1240392 Heading C2C Novel 2,3,5 - trisubstituted - 6 - trifluoromethyl - 1,3 - diazin - 4 - ones having the general formula wherein R<SP>2</SP> is ortho, meta- or para-fluorophenyl or meta-trifluoromethylphenyl, together with salts and/or tautomers thereof, are prepared by. reacting an ester of a #-amino-α,#-unsaturated acid, or a tautomer thereof, of the formula wherein R 5 is alkyl, with an isocyanate of the formula R<SP>2</SP>.NCO in the presence of at least one solvent and at least one base selected from alkali - metal hydrides and alkali metal alkoxides. The novel compounds possess herbicidal properties. |
