Process for the manufacture of sulfonylaminocarbonyl triazolinones and salts thereof under pH controlled conditions
AssigneeBayer Aktiengesellschaft
InventorsVidyanatha A. Prasad, Klaus Jelich
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Abstract
The present invention relates to a process for manufacturing sulfonylaminocarbonyl triazolinones and salts thereof, which are herbicidally active compounds, wherein the improvement comprises conducting the conversion reaction of the sulfonylaminocarbonyl triazolinone to a salt thereof under pH controlled conditions. In particular, this invention relates to the conversion of a substituted triazolinone to a sulfonylaminocarbonyl triazolinone, and without the isolation of this intermediate product, the sulfonylaminocarbonyl triazolinone is then converted to a salt thereof.
Claims14
A process for preparing a sulfonylaminocarbonyl triazolinone or a salt thereof, comprising the steps of:
- a) reacting a substituted triazolinone of the following general formula (I) ##STR20## wherein R.sup.1 and R.sup.2 each represents an unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl radical,
- with a sulfonyl isocyanate of the following general formula (II)
- O.dbd.C.dbd.N--SO.sub.2 --R.sup.3 (II)
- wherein
- R.sup.3 represents an unsubstituted or substituted alkyl, aryl, arylalkyl or heteroaryl radical,
- to produce a sulfonylaminocarbonyl triazolinone intermediate product of the general formula (III) ##STR21## wherein R.sup.1, R.sup.2, and R.sup.3 are as defined above, and b) reacting the intermediate product under pH controlled conditions with a base to produce a salt thereof, a final product of the general formula (IV) ##STR22## wherein R.sup.1, R.sup.2, and R.sup.3 are as defined above, and M represents an alkali or alkaline earth metal, or protonated ammonia derivative.
Dependencies are inferred from the claim text.