1,2-Ethanediamine, 4-methylbenzenesulfonate (1:?) → 2-(2,5-DICL PH IMINO)IMIDAZOLIDINE

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Reaction Steps

2.8 g (0.01 M) of N-(2,5-dichlorophenyl)-N'-acetyl-S-methylisothiourea and 7.0 g (0.03 M) of ethylenediamine mono-p-toluenesulphonate are boiled with 30 ml of n-amyl alcohol for 5 hours. The reaction solution is washed with 50 ml of a saturated solution of sodium carbonate and 50 ml of water. The amyl alcohol is distilled off under vacuum until a dry residue is obtained which after being recrystallized from ethylacetate gives 1.5 g (65% of the theoretical yield of 2-(2',5'-dichlorophenylamino)-imidazoline (2) with a melting point of 179°-182° C. The hydroiodide salt of the above compound has a melting point of 275°-277° C. According to the U.S. Pat. No. 2,899,426 the melting point of 2-(2',5'-dichlorophenylamino)-imidazoline-(2) hydroiodide is 275.4°-277°.

Provenance & Evidence