| 摘要 |
Alkoxytriazolinones of the general formula (I), <IMAGE> (I) in which R1 represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, and R2 represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, (which can be used as intermediates for the preparation of herbicidal active compounds) are obtained in very good yields and in high purity by reacting imino(thio)carbonic esters (II) with alkoxyethyl carbazinates (III) <IMAGE> +TR <IMAGE> in which Q represents O or S, R3 represents (for example) alkyl, aryl or aralkyl and R4 represents (for example) alkyl, at -20 DEG C. to +150 DEG C. (1st step) and subjecting the new semicarbazide derivatives (IV) <IMAGE> which are formed with elimination of R3-QH, if appropriate after intermediate isolation, to a cyclizing condensation reaction at 0 DEG C. to 200 DEG C., without the addition of a base, advantageously under reduced pressure, with the elimination of alkoxyethanols (2nd step).
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