Basf Aktiengesellschaft

Juergen Dressel

Ernst-Heinrich Pommer

Norbert Rieber

Gisela Lorenz

Helmut Hagen

Toni Dockner

Hans Ziegler

Klaus Wagner

Juergen Pfister

Gerhard Nilz

Heinrich Boehm

2-Amino-4-trichloromethylpyridines of the general formula I ##STR1## where R.sup.1 is hydrogen or C.sub.1 -C.sub.8 -alkyl,

2-amino-4-trichloropyridine derivatives

Nitrification inhibitors contain azole hemiaminal derivatives of the formula ##STR1## where R.sup.1 and R.sup.2 are each hydrogen, alkyl, aryl or halogen, R.sup.3 is alkyl, cycloalkyl, alkoxy, alkenyl, alkynyl, styryl, aryl, hetaryl or aralkyl, where the aromatic radical may be substituted, or is hydroxyl, A and B are each N or CR.sup.4, and R.sup.4 is hydrogen, alkyl, aryl or halogen.

Azole hemiaminal derivatives and their use as nitrification inhibitors

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.

Nitrification-inhibiting 1-hydroxypyrazole derivatives

4-Alkylimidazole derivatives of the formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, R.sup.2 is chlorine or bromine and R.sup.3 is an --OR.sup.4 or --NR.sup.5 R.sup.6 group in which R.sup.4 is C.sub.1 -C.sub.4 -alkyl, R.sup.5 is hydrogen or C.sub.1 -C.sub.4 -alkyl and R.sub.6 is C.sub.1 -C.sub.4 -alkyl or is phenyl which is unsubstituted or substituted by 1 or 2 halogen atoms, and its salts, their preparation and their use as nitrification inhibitors.

4-alkylimidazole derivatives and their use as nitrification inhibitors

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Neuhofen, Germany

Juergen Dressel