Reactions of salts of polycyclic derivatives of hydrogenated indole with potassium iodobismuthate

Iodobismuthates of five derivatives of hydrogenated indole, namely, strychnine, brucine, physostigmine, pyrazidole, and carbidine, were prepared by treating salts of the latter with potassium iodobismuthate preparations containing different amounts of the addend, and they were isolated and characterized. The iodobismuthates of the monoacid bases (I)-(IV) correspond to a structure of constant composition Ht.HBiI4. The salt of the diacid base carbidine forms different products in reaction with the reagent; their composition depends on the concentration of the addend in the aniono complex. Potassium iodobismuthate is shown to be promising as a reagent for the development of a bismuthometric method for the determination of salts of organic bases in medicinal preparations