以下为句子列表：
英文: Abstract: Tertiary butylhydroquinone were synthesized by means of alkanisation with actalyst of cation exchange resin in this paper,and discusses several effective fators to the yield of tertiary butylhydroquinone,including the type of cation exchange res
中文: 文摘:以强酸型阳离子交换树脂为催化剂通过烷基化合成叔丁基对苯二酚，并系统地研究了树脂型号、物料比、反应时间等因素对合成收率的影响，确定了最佳反应条件。
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英文: Hydroxyquinol triacetate was prepared from p-benzoquinone by 1,4-addition reaction with acetic anhydride and then 6,7-dihydroxy coumarin was synthesized from it by hydrolyze and cyclization in concentrated sulfuric acid.Then 6,7-dimethoxy coumarin was syn
中文: 对苯醌与乙酸酐经1,4-加成生成1,2,4-苯三酚三乙酸酯,然后与苹果酸反应经水解、环合反应得6,7-二羟基香豆素,再经甲基化得到6,7-二甲氧基香豆素,总收率为74.4%,整个过程反应条件温和,操作方便,适合工业生产的要求,对产品结构进行了IR和1HNMR表征。
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英文: More anthraquinone compounds was distributed in pith ray cells and the tissues of mature stem suchas bundle sheaths in large-scale vascular bundle, primary phloem and primary xylem than that in young stem. [Conclusion] The distribution of anthraquinone co
中文: ［结果］随着茎的不断成熟，在茎的表皮、近表皮的1~2层皮层细胞及较内部皮层中，不同程度地增加贮藏和积累了一定数量的蒽醌类化合物，成为茎外部贮藏和积累蒽醌共化合物的主要结构部位成热茎大型维管束的维管束鞘、初生韧皮部、初生木质部等组织和髓射线细胞分布了比幼茎多的蒽醌类化合物。
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英文: Pl. note that we are getting one extra impurity peak ( Marked in RED )as earlier problematic consignment at the RT = about 4.30, before Rifa Quinone RT = about 6.25) having more% than Rifa quinone as well as not complying the USP Lim = NMT 1.0%.
中文: 请注意我们得到了一个额外的杂质峰（红色标记），保留时间约4.30，在醌氏利福平保留时间约6.25之前，醌氏利福平有一更高的百分比，也不符合USP限度不超过1.0%.
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英文: The CV redox peak with fixed hydroquinone was larger than that without fixed hydroquinone.
中文: 经对苯二酚固定之电极循环伏安法所得之还原较未经对苯二酚固定者为大。
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