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 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， , -二烯的环化及应用前景。
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 a " as solvent 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 % 。
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 , with overall yield of 22 . 6 % 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。
Research on key techniques in test vector cyclization translation . in this paper , we present a proposed cyclization method that combines sampling method and waveform method . using this method , the procedure is to need a timing set in every period 本文为了实现由芯片设计仿真出来的测试向量到测试设备的测试程序的转换,在分析了不断变化的测试需求后,本文提出了一种类stil的波形数据格式。
Long chain alkyl benzenes is the product of cyclization - decarboxylation - aromatization of fatty acid , with the help of clay minerals catalytic effect , which comes from bacteria , seaseed and higher plant lipid ; or the reaction product of monocylic aromatics and fatty acid alkyl group under the same conditions 长链烷基苯主要是细菌、藻类和高等植物类脂化合物中脂肪酸在粘土矿物催化下发生环化脱羧再芳构化或单环芳烃与脂肪酸烷基化反应形成的产物。
From a viewpoint of organic synthesis chemistry , the recent development and applications of molecular iodine as a catalyst in organic reactions including the formation and cleavage of common protecting groups , oxidation , reduction , cyclization , addition , substitution and rearrangement are reviewed 从有机合成化学的角度，按反应类型综述了分子碘作为催化剂在有机化学中的应用，碘催化的反应主要涉及保护基团的形成和裂解、氧化和还原反应、成环反应、加成反应、取代反应和重排反应等。
From a viewpoint of organic synthesis chemistry , the recent development and applications of molecular iodine as a catalyst in organic reactions including the formation and cleavage of common protecting groups , oxidation , reduction , cyclization , addition , substitution and rearrangement are reviewed 摘要从有机合成化学的角度，按反应类型综述了分子碘作为催化剂在有机化学中的应用，碘催化的反应主要涉及保护基团的形成和裂解、氧化和还原反应、成环反应、加成反应、取代反应和重排反应等。
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 synthesized by methylating from 6 , 7 - dihydroxy coumarin with an overall yield of 74 . 4 % . the procedure was practical . its structure was confirmed by ir and 1hnmr 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。
