在百泉山上的岩石里,有兵蚁出没.There are soldier ants in the cave of the Spring mountain.本文主要讨论采用不同提取方法所得家白蚁兵蚁的外分泌化合物的组成及相对含量的变化.To investigate the exocrine compounds of coptotermes formosanus dinergate exocrine concentrate was obtaine...
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...