以下为句子列表：
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: Methods Pinocembrin and its derivatives were synthesized with 2,4,6-trihydroxy-phenylethanone as the starting material via four steps including protection of the hydroxy-group, condensation, cyclization and deprotection.
中文: 方法以2,4,6-三羟基苯乙酮为起始原料，经羟基保护、缩合、环化、脱保护合成目标化合物。
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英文: Mirtazapine was prepared by a seven-step reaction, namely nucleophilic ring-opening reaction, chlorination, cyclization, uncleophilic substitution, hydrolysis, reduction and cyclization from styrene oxide and N-methylethanolamine as the starting materials
中文: 摘要以环氧苯乙烯和N-甲基乙醇胺为起始原料，经亲核开环、氯代和环合反应得到中间体1-甲基－3-苯基哌嗪。
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英文: The paper introduces a new highly-effective synthesis method. Decoquinate was synthesized with catechol as starting materials via substitution, reduction, and at last cyclization with Dowtherm Aas solvent.
中文: 摘要以邻苯二酚为原料，通过一系列取代反应，再经过还原、缩合，最后在高沸点的混合有机溶剂中关环。制备的3-喹啉羧酸乙酯衍生物的总收率为24.2%。
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英文: The recent advances in olefins oligomerization catalyzed by metallocene catalyst have been reviewed. Emphasis is given to the catalytic reactions, cyclization and prospect of application of metallocene catalyst.
中文: 摘要本文介绍近年来国内外在茂金属催化剂烯烃剂聚与环化方面的研究进展，主要侧重于茂金属催化剂烯烃剂聚，α,ω-二烯的环化及应用前景。
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