Non-aqueous oxidimetry of terpenes with mangamic salt and bromine in N, N-dimethylformamide

Abstract

Oxidimetric determination of the terpenes (citral, citronellol, geraniol, nerol and perillartine) with manganic salt and bromine in DMF was investigated. The solution of {Mn (III) salt +phosphoric acid} in DMF and those of bromine in DMF were found to be stable. Citral was treated with manganic salt dissolved in DMF containing 45% of anhydrous phosphoric acid at 25°C for 40 min. Perillartine was treated in DMF containing 25% of the same acid at 45°C for 20 min. Determination of citral and perillartine was carried out with manganic salt by using the above conditions. Citronellol, geraniol and nerol were determined with bromine in DMF. A reactive ratio of terpenes and manganic salt was observed at 1:2, and inflection points at 2:1, 1:1 and 1:2 were obtained by using bromine as a standard solution. The addition of magnesium chloride was effective to simplify and clarify the inflection points.