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US 5,969,152 AGranted
Process for the preparation of nitropyrazole esters
AssigneeBayer Aktiengesellschaft
InventorsLutz Heuer, Nikolaus Muller, Guido Steffan
Life of this patent
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Abstract
Nitropyrazole esters of the formula ##STR1## in which R.sup.1 represents C.sub.1 -C.sub.6 -alkyl, are prepared by nitration of the corresponding pyrazole esters. The nitropyrazole esters permit the preparation of a known nitropyrazole amide in a particularly simple and economical manner and thereby improve the preparation of active compounds which are accessible from the nitropyrazole amide.
Claims6
A process for the preparation of nitropyrazole esters, which comprises nitrating pyrazole esters of the formula ##STR5## in which R.sup.1 represents C.sub.1 -C.sub.6 -alkyl
- with a nitrating agent having a water content of 0-5% by weight.
Dependencies are inferred from the claim text.