| 摘要 |
1506538 5,6 - Disubstituted - 3 - (2<SP>1</SP> - tetrahydropyranyl) - 1,2,3,4 - tetra hydropyrimidin- 2,4-dione ROUSSEL UCLAF 20 Aug 1976 [21 Aug 1975] 34865/76 Addition to 1364086 Heading C2C 5,6 - Disubstituted - 3<SP>1 </SP>- (2<SP>1 </SP>- tetrahydropyranyl) - 1,2,3,4 - tetrahydropyrimidin - 2,4- diones of general formula wherein R 1 is n-propyl and R 2 is Cl or R 1 is methyl and R 2 is ethyl, n- or isopropyl or R 1 and R 2 are both ethyl groups, are prepared by cyclizing a compound of formula under basic conditions. The preparation of all 5 claimed compounds is described. Herbicidal compositions contain a compound of formula I as active ingredient together with a vehicle therefor. |
