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US 5,705,698 AGranted
Process for the production of pendimethalin and iso-pendimethalin
AssigneeSRM Chemical, Ltd. Co.
InventorsLowell J. Lawrence, Stefan Kwiatkowski, Krzysztof Pupek, Miroslaw J. Golinski
Life of this patent
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Abstract
A process is provided for the preparation of isometrically pure pendimethalin and iso-pendimethalin as well as mixtures thereof.
Claims2
A process for producing isometrically pure pendimethalin comprising:
- nitrating an o-xylene starting material in order to produce trinitro substituted intermediates I and II having chemical formula:
- ##STR6## separating trinitro substituted intermediate (I) from trinitro substituted intermediate (II);
- and
- aminating said separated trinitro substituted intermediate (I) with 1-ethylpropylamine to produce pendimethalin.
1 more element
A process for producing isometrically pure iso-pendimethalin, comprising:
- nitrating an o-xylene starting material in order to produce trinitro substituted intermediates I and II having chemical formula:
- ##STR7## separating trinitro substituted intermediate (II) from trinitro substituted intermediate (I);
- and
- aminating said separated trinitro substituted intermediate (II) with 1-ethylpropylamine to produce iso-pendimethalin.
1 more element
Dependencies are inferred from the claim text.