| http://www.w3.org/ns/prov#value | - Chem. 2000,112, pp. 3926-3945, and the references cited therein.Suitable alkyl radicals by means of which the nitrogen atom in the amines or nitrogen heterocycles is quaternized are C.sub.1-C.sub.18-alkyl, preferably C.sub.1-C.sub.10-alkyl, particularly preferably C.sub.1-C.sub.6-alkyl and very particularlypreferably methyl.Preference is given to compounds comprising at least one five- to six-memb
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