作者:Shigehiko Sugasawa、Makoto Kirisawa
DOI:10.1248/cpb1953.4.139
日期:——
The report made by Sugasawa and Ban that the oily oxidation product, produced in 66% yield, of 1-methyl-3-ethylpyridinium methosulfate consisted of 1-methyl-3-ethyl-2-pyridone only, was in error, which was caused by a cursory examination of the distillation product. The present study revealed that the oily oxidation product was really a mixture of 1-methyl-3-ethyl-2-and-6-pyridone in proportion of approximately 8 : 1. Their separation was made possible through picrates, of which the one from the 2-pyridone is freely soluble in ether, whereas the other is practically insoluble in cold ether. By using the oxidation agent in a certain excess, the yield of the product attained as high as 84% of the theoretical.
菅笹和伴的报告中提到,1-甲基-3-乙基吡啶鎓甲硫酸盐在66%产率下产生的油状氧化产物仅由1-甲基-3-乙基-2-吡啶酮组成,这一结论存在错误,原因在于对蒸馏产物草率检查。本研究揭示,该油状氧化产物实际上是1-甲基-3-乙基-2-和-6-吡啶酮的混合物,比例约为8:1。通过苦味酸盐可以实现它们的分离,其中2-吡啶酮的苦味酸盐在乙醚中极易溶解,而另一者在冷乙醚中几乎不溶。通过使用过量的氧化剂,产品的产率达到了理论值的84%。