The effects of different solvent,temperature&concentration on the selective proportion of direct synthesis of p-bromophenol,o-bromophenol&2,4-dibromophenol have been studied. 研究了在非極性溶劑和部分極性溶劑中以苯酚為原料進(jìn)行直接溴化反應。
According to the theory that similarities can be solvable easily in each other,nonpolar ethyl diol dimethyl ether is used to extract nonpolar compounds in ginkgo biloba leaves. 根據銀杏葉內不同有效成分極性不一樣和相似相溶原理，選用乙二醇二甲醚這一非極性溶劑提取銀杏葉中非極性成分。
