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Peter Schmidt

Karl Kolter

Dieter Lenke

Ivette Garcia Castro

Hans P Hofmann

Siegfried Lang

Rainer Schlecker

Bernhard Fussnegger

Hans-Jurgen Teschendorf

Claus D Mueller

Horst Kreiskott

Peter C Thieme

Hermann Ascherl

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Karl-Hermann Strube

Martin Traut

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Manfred Kroll

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Frank Höfer

Method for stabilizing polyvinylpyrrolidones, which comprises treating the polyvinylpyrrolidones with sulfur dioxide, sulfurous acid or alkali metal sulfites and then with free-radical scavenger, and converting the solutions treated in this way into the powdered polyvinylpyrrolidones by drying.

Method for the stabilization of polyvinylpyrrolidones

Direct tabletting aids

Sulfonates of hydroxycoumarins of the formula I ##STR1## where R.sup.1 and R.sup.2 are identical or different and are each hydrogen, halogen or alkyl of 1 to 5 carbon atoms which can be substituted by --NR.sup.4 R.sup.5, --OR.sup.4 or --OC(O)R.sup.4, where R.sup.4 and R.sup.5 are identical or different and are each hydrogen or alkyl of 1 to 4 carbon atoms, or R.sup.1 and R.sup.2 are each a carboxylic acid group --OC(O)R.sup.4 or a carboxamido radical, with the proviso that R.sup.1 is not methyl when R.sup.2 is hydrogen, or R.sup.1 and R.sup.2 together form a --(CH.sub.2).sub.n -- chain where n is 3-5, and R.sup.3 is a straight-chain or branched alkyl radical of 1 to 8 carbon atoms or cycloalkyl of 3 to 8 carbon atoms, each of which can be substituted by halogen, --OR.sup.4, --NR.sup.4 R.sup.5, --CN or phenyl, or R.sup.3 is a straight-chain or branched alkenyl radical of 3 to 8 carbon atoms, an amino group -- NR.sup.4 R.sup.5, or phenyl or naphthyl, each of which is unsubstituted or monosubstituted or polysubstituted by --OR.sup.4, --NR.sup.4 R.sup.5, --NO.sub.2, halogen, --SR.sup.4, --S(O)R.sup.4, --OS(O)R.sup.4, --SCF.sub.3, --OS(O)CF.sub.3, --CN, --C(O)R.sup.4, --OC(O)R.sup.4, --NHC(O)R.sup.4, --CF.sub.3, C.sub.1 -C.sub.4 -alkyl or a combination of these substituents, a process for their preparation, drugs containing these compounds, and compounds of the formula I, in which R.sup.1 is methyl and R.sup.2 is hydrogen, for use as drugs.

Sulfonates of hydroxycoumarins

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Peter Schmidt