简要介绍以此类方法对合成苯甲醛的研究.Based on the reactions , this paper reports research for synthesizing benzaldehyde.再溴代得到2-溴 -4,5-二甲氧基苯甲醛,收率为91.9%,并分析溴代过程中甲酰基的邻位效应及溴代产物的稳定性.This product with Br 2 was obtained 2 - bromo - 4,5 - hydroxy...
The story was so funny that we were all in convulsions.那个故事真滑稽,引得我们捧腹大笑.She went into convulsions several hours after the accident and had to be rushed to a hospital.事故发生几小时后她开始抽搐,被迅速送进了医院。...the political convulsions th...
The influence of underground pressure on water - inrush quantity is analyzed.分析了矿山压力对突水量的影响作用.The water - inrush possibility during mining depth coal layer is assessed.评价了肥城煤田深部开采底板突水的可能性.Water inrush prediction is an im...