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;

该工艺较优的反应条件：2，2’-啶与1，2-二溴乙烷的投料比(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.

以啶为原料,经氧化、硝化、铁-酸还原或催化加氢4-氨基啶及其4-氨基啶的路线;