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Ten new quaternary pyridinium salts with urea or carbamate group were prepared and the acidity constants determined. On addition of base to the salts ot pyridyl-urea, stable inner salts could be isolated.

zeitschrift für naturforschung b

Untersuchungen an quartären Pyridinium-Salzen, VII 1  Pyridinium-Salze mit Harnstoff-und Carbamidester-Gruppe. Darstellung einiger Betaine / Investigations of Quaternary Pyridinium Salts, VII 1  Quaternary Pyridinium Salts with Urea or Carbamate Group. Preparation of Inner Salts