# US 5,705,698 A · Process for the production of pendimethalin and iso-pendimethalin

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- Number: US 5,705,698 A
- Document ID: US5705698A
- Status: Granted
- Kind: A
- Application number: 08/621,403
- Filed: 1996-03-25
- Granted: 1998-01-06
- Earliest claimed: 1996-03-25
- Assignees: SRM Chemical, Ltd. Co.
- Inventors: Lowell J. Lawrence; Stefan Kwiatkowski; Krzysztof Pupek; Miroslaw J. Golinski
- Web page: https://patentgrep.com/patent/US5705698A

## CPC

- C07C 209/22: by substitution of other functional groups
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process is provided for the preparation of isometrically pure pendimethalin and iso-pendimethalin as well as mixtures thereof.

## Claims

### Claim 1

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.

### Claim 2

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.