Nitrification-inhibiting 1-hydroxypyrazole derivatives

US4673429A · kind A · utility

Assignee

• BASF SE

Inventors

• Norbert Rieber · Mannheim, DE
• Heinrich Boehm · Schifferstadt, DE
• Ernst-Heinrich Pommer · Schifferstadt, DE
• Juergen Dressel · Schifferstadt, DE

Key dates

• Filing date: Mar 13, 1985
• Grant date: Jun 16, 1987
• Expiry date: Mar 13, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S71/902
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1-Hydroxypyrazole derivatives of the formula (I) ##STR1## where A is ##STR2## n is 0 or 1, R.sup.1, R.sup.2 and R.sup.3 independently of one another are each hydrogen, chlorine, bromine or iodine, R.sup.4 is hydrogen, a straight-chain or branched, open-chain alkyl, alkenyl or alkynyl radical, a cyclic alkyl, alkenyl or alkynyl radical or aryl or aralkyl, and the radicals R.sup.4 which are capable of substitution may furthermore be monosubstituted or polysubstituted by halogen, haloalkyl, haloalkoxy, alkyl, alkoxy, alkoxycarbonyl, --OH, .dbd.O, --COOH or salts of this, --NO.sub.2 or --CN, have a nitrification-inhibiting action. Substances where R.sup.4 is not hydrogen when n is 0 are novel.