dibromide

The better reaction conditions for the way are as follows: The ratio of 2,2"-bipyridyls to ethylene dibromide(molar ratio)is 1:1.2;

该合成工艺反应条件是：2，2’-联与1，2-二溴乙烷投料比(摩尔比)为1：1.2，反应温度211℃，反应时间2小时。

2) using pyridine as raw material and pyridine N-oxide et al as medium products ;3) 4-pyridyl-pyridinium dichloride (dibromide) as medium products.

以为原料,经氧化、硝化、铁-酸还原或催化加氢合成4-氨基及其他合成4-氨基路线;