随着反应时间的延长，有羟基邻位和对位双硝基化以及羟基两个邻位双硝基化产物生成。
Dinitrations occurred at two ortho-positions or both ortho- and para-positions to the hydroxy group with longer reaction time than mononitration.
以双酚a、溴水和过氧化氢为原料，采用非均相催化反应技术合成四溴双酚a的新工艺。
The new preparation process of tetrabromobisphenol - a with bisphenol - a, bromine and hydrogen peroxide as raw materials by a heterogeneous catalyst reaction has been introduced in this paper.
研究了酸度对苯胺与双氰胺加成反应生成苯基双胍的影响。
The effect of acidity on the synthesis of phenylbiguanide from the additive reaction of aniline with dicyandiamide was studied.
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