| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to production of intermediate compounds for producing a valuable herbicide of formula (3):,where Ris H, Ris Calkyl or Calkoxy. The method includes dehydrocondensation of compoundsand,where Rand Rare as given above. In the method, the product is converted to the required geometric isomer optionally in the presence of an acid catalyst in a solvent consisting of acetic acid and toluene, xylene or chlorobenzene in volume ratio of 1:3 to 1:5. The reaction is carried out while boiling with a reflux condenser. The new method exhibits excellent solubility of the novel compound - (Z)-2-methoxycarbonylamino-4-(hydroxymethylphosphenyl)-2-butenoic acid, which is significant in a reaction for inhibiting decomposition of a reagent of formula (2).EFFECT: high output.5 cl, 1 tbl, 6 ex |
