1 2 the imino ether 1 (X= OCHJ was desired. An obvious possibility was the chloropyrroline 1 (X= C1). 2 Indeed, when pyrrolidone and phosphorus pentachloride were allowed to react, the same compound reported earlie9 was obtained; however, the proton NMR spectrum did not match the expected structure. In addition, sodium methoxide in refluxing methanol had no effect on the compound and alcoholic silver nitrate gave no silver chloride. The sample ...
