Method for preparing amino-triazolinone
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United States of America Patent
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Feb 17, 2015
Grant Date -
Jun 12, 2014
app pub date -
Jul 27, 2012
filing date -
Jul 28, 2011
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Abstract
The present invention relates to a method for preparing an amino-triazolinone which can be used as a raw material for amicarbazone and has chemical formula (I). The method for preparing the amino-triazolinone includes the steps of: reacting an acyl hydrazide of chemical formula (II) with a carbamating agent of chemical formula (III) or (IV) so as to obtain a hydrazine carboxylic acid of chemical formula (V); and reacting the thus-obtained hydrazine carboxylic acid of chemical formula (V) with a hydrazine hydrate under the presence of a base catalyst. According to the present invention, the amino-triazolinone may be stably prepared without using safety equipment or safety facilities for a possible leakage of phosgene, which has been used as a conventional reactant. Thus, manufacturing costs for amicarbazone, which is used as a herbicide for farm products such as sugar cane, corn, or the like, can be reduced so as to achieve improved price competitiveness, and further to achieve improved cost competitiveness compared to other herbicides.
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