METHOD: 7-( coumarin-3-formamido)-cephalosporin was reacted with pyridine and β-methylpyridine in the presence of NaI or KSCN; the prodcts were isolated by macroporous resin and sephadex column chromatogrophy. 方法:7-(香豆素-3-甲酰胺)头孢菌素在NaI或KSCN的存在下与吡啶和β-甲基吡啶反应,产物用大孔吸附树脂及葡聚糖凝胶柱层析分离。
It has been found that the molecular weight of PMIA increases clearly when α-methylpyridine is used as additive in polymeric reaction. 结果表明,在PMIA树脂合成中加入添加剂α-甲基吡啶,对提高PMIA分子量作用明显。
The isoniacin ( 4 picolinic acid) was electrochemically synthesized from 4 methylpyridine in aqueous sulfuric acid solution using Ti/ PbO 2 as anode. 以钛基二氧化铅电极(Ti/PbO2)为阳极,在硫酸水溶液介质中,电解氧化4-甲基吡啶合成异烟酸。
Various processess for separating 3-methylpyridine and 4-methylpyridine are reviewed in this paper. And the developing trend is also discussed. 笔者综述了3甲基吡啶与4甲基吡啶混合体系的各种分离方法,并对其应用前景进行了展望。