255 research outputs found
The Theoretical Study of the Synthesis and Conversion of Conjugated Osmacycles
在站期间的研究工作主要集中在“新型金属杂稠环芳烃的构筑研究”、“经典有机反应在金属杂环体系中的拓展研究”两大方向。本报告主要内容概括如下: (1)首次将碘促进的亲电环化反应拓展到金属苯体系,得到了一系列新的金属杂多环化合物,并对该亲电环化反应的关键中间体(碘鎓化合物)进行分离和表征。结合实验数据进行理论计算表明该碘鎓化合物为一个紧密型离子对化合物,并非被广泛认可的环状碘鎓结构。从而对碘促进的亲电环化反应体系的相关研究提供了全新的视角。 (2)设计实现了基于金属苯合成具有新颖结构的金属杂稠环芳烃--含有全新金属杂吡啶炔单元的金属杂异喹啉炔及含全新m-金属杂吡啶单元的金属杂异喹啉,从而发展构筑...Transition-metal-containing metallacycles are currently attracting considerably attentions because of their unique properties and organometallic reactivities. In this report, several unprecedent fused osmacycles were prepared by employing some classic organic reactions. The related mechanisms of these reacions have also been thoroughly studied. In addition, several key intermediates of the reactio...学位:理学博士院系专业:化学化工学院化学系_有机化学学号:BH1700027
人脾动脉在脾内的节段性分布
近年来的研究认为:脾脏参与免疫调节。全脾切除后,可能并发全身严重感染,尤以2岁以下婴儿更易产生严重感染。提出对脾损伤患者尽量不切除全脾。因此,脾动脉在脾内的节段性分布引起了越来越多的学者的注意。吉川文雄认为可将脾脏分为3~6段,Gupta和Mikhald观察到脾脏可分为2~3段,在段间有与器官长轴垂直的“无血管区”分隔;国内张琼珍、陈维佩分别研究了胎尸和成人尸体脾,认为大多数脾脏可划分为4~5段。由于各家分段标准不一,所得结果自然不尽相同,而且叶和段还未有明确的表面标志。因此,本文就脾动脉在脾内的节段性分布进行研究
On Research of Cultural Integrations for Chinese Enterprises in cross-border modes of draft
本文分析了中国企业近几年实施的跨国并购中文化整合失败的原因,并结合我国的实际提出了相应的文化整合对策,以期为我国企业跨国并购中的文化整合提供有益的参考。This paper mainly discusses the implementation of Chinese enterprises in recent years,according to the case study method to analyze the cross-boarder mergers and acquistitions(M&A).Study the detail analysise TCL and LENOVO combined with corporate culture of Denison model.Associate the two companies in the M&A failure and successful experience the difference between enterprise culture and enterprise culture construction deficiencies and advantages baswed on the model to the reality of our coun6try puts forward corresponding cultural integration proposal.Hope to provide useful reference for Chinese enterprises and transnational cultureal integration activities
玩转钴乐园
钴是元素周期表27号元素,本文借用游乐园的形式,用轻松生动的语言介绍钴及其化合物的性质与应用。国家基础科学人才培养基金项目(J1310024)2017年厦门大学教学改革研究项目(JG20170222
Diaquabis [(pyrimidin-2-ylsulfanyl)acetato]copper(II) dihydrate
In the title compound, [Cu(C6H5N2O2S)(2)(H2O)(2)] (.) 2H(2)O, the Cu atom lies on an inversion centre in a distorted square coordination geometry that consists of two O atoms of two (pyrimidin-2-ylsulfanyl) acetate ligands [Cu-O = 1.953 (2) angstrom] and two O atoms of two water molecules [Cu-O = 1.942 (3) angstrom]
氯代烷烃、硫粉和氢亚磷酸酯一步合成S-烷基硫磷酸酯
S-苄基硫磷酸酯和S-烷基硫磷酸酯在农药中有着重要的应用。本文发展了一种无需催化剂,仅在碱作用下,氯代烷烃、硫粉以及氢亚磷酸酯三组份一步生成S-烷基硫磷酸酯的绿色经济方法,该反应可以在一步反应中同时构建磷—硫键和碳—硫键。以苄氯及衍生物、硫粉、氢亚磷酸酯在碳酸铯的促进下,室温反应,共合成了17个S-苄基硫磷酸酯,产率为70%~99%。同时,实现了脂肪链的氯代烃、硫粉和氢亚磷酸酯的反应,在三乙胺的促进下,在空气中60℃反应,共合成了13个S-烷基硫磷酸酯,产率为45%~93%。本方法在合成上和工业上将具有较好的应用前景。国家自然科学基金(21772163)资助项目~
Synthesis of Ruthena-polycyclic Complexes by Ruthenium-Vinylcarbene Complex
研究了配位不饱和的钌杂S-顺丁二烯化合物[ru(CHC(PPH3)CH(2-Py))Cl2PPH3]bf4(1)与水、甲醇、苯胺和2-巯基吡啶等亲核试剂的[4+1]关环反应,合成了一系列有趣的钌杂多环化合物[ru(CHC(PPH3)CHr(2-Py))Cl(PPH3)2]bf4[r=OH(2),OME(3),和nHPH(4)]与[ru(CHC(PPH3)CH(S(2-Py))(2-Py))PPH3(S(2-Py)]bf4(5).此外,将配位不饱和的钌配合物1与三苯基膦配体反应,制备了类似于氮杂金属萘的配位饱和化合物[ru(CHC(PPH3)CH(2-Py))Cl2(PPH3)2]bf4(6).6与Hbf4反应可生成金属杂环结构类似的分子内含三氯桥的双钌核配合物[{ru(CHC(PPH3)CH(2-Py))PPH3}2(μ-Cl)3](bf4)3(7).以上产物均通过核磁(nMr)与元素分析进行了表征,并解析了部分产物的X射线单晶结构.Treatment of ruthenium-vinylcarbene complex [Ru(CHC(PPh3)CH(2-Py))Cl2 PPh3 ]BF4(1) and PPh3 with nucleophilic reagents H2 O,CH3 OH,NH2 Ph,or 2-mercaptopyridine led to the ruthena-polycyclic complexes [Ru(CHC(PPh3)CHR(2-Py))Cl(PPh3)2 ]BF4 [R = OH(2),R = OCH3(3),R = NHPh(4)] or [Ru(CHC(PPh3)CH(S(2-Py))(2-Py))PPh3(S(2-Py)]BF4(5).They are stable under air at solid state.CH3 OH in the reaction is not only the reagent but also the solvent and the reaction must be heated at 60 ℃ for 6 h.All the other reactions were carried out at room temperature in CH2Cl2.The crystals of 4 and 5 were grown from CH2 Cl2 and CHCl3 solutions layered with diethyl ether,respectively.The structures 4 and 5 were determined by X-ray crystallography.The crystal size of 4 is a=1.29145(3) nm,b=1.37687(5) nm,c= 1.86914(4) nm,α=92.114(2)°,β=106.271(2)°,γ=96.333(3)° and the size of 5 is a=1.15333(18) nm,b=1.20072(19) nm,c=1.9081(3) nm,α=88.466(3)°,β=87.918(3)°,γ=79.521(3)°.In addition,refluxing 1 with PPh3 in CHCl3 for 6 h to produce red solid [Ru(CHC(PPh3)CH(2-Py))Cl2(PPh3)2 ]BF4(6).The reaction of complex 6 with HBF4 at room temperature for 3 h afforded the(μ-Cl)3-bridged bisruthenium-vinylcarbene complex [{Ru(CHC(PPh3)CH(2-Py))PPh3 }2(μ-Cl)3 ](BF4)3(7) in 87% yield.The crystal of 6 was grown from CH3 COCH3 solution layered with diethyl ether,and the crystal of 7 was grown from CHCl3 solution layered with diethyl ether.The structures of 6 and 7 were also determined by X-ray crystallography.The crystal size of 6 and 7 are a=1.13777(3) nm,b=1.56466(7) nm,c=1.79541(7) nm,α=75.822(3)°,β=79.502(2)°,γ= 79.259(3)°,a=1.68830(3) nm,b=2.33421(4) nm,c=2.48603(4) nm,α=90°,β=96.5530(10)°,γ=90°,respectively.The CCDC number for 3,5,6,and 7 are 945539(3),945538(5),945541(6),and 945542(7).All these complexes were fully characterized by elemental analysis and NMR spectroscopy.国家重点基础研究发展计划(No.2012CB821600); 国家自然科学基金(Nos.20925208;21174115;21272193); 长江学者和创新团队发展计划资助~
Progress of Study on Linear Carbon Bridged Organometallic Molecular Wires
由过渡金属与线性有机共轭桥组成的“分子导线”以其在一维分子导体、液晶材料和非线性光学材料等方面的潜在应用价值引起学术界和产业界的关注 .结合自己在此方面所做的工作 ,从合成、性质等方面对近年来含线性碳桥金属有机“分子导线”的研究进展作一综述.The complexes containing C x and C x H x carbon chains spanning multi transition metals are of current interest due to their anticipated useful properties in molecular electronics and nonlinear optical materials. This paper reviewed the recent advances in this exciting field
书院制国际化办学模式的实践探索——以博伊特勒书院为例
新形势下加快我国现代书院的国际化进程,不仅具有十分重要的意义,且已成为其发展战略的必然选择。文章对我国书院国际化的重要意义及国内书院制的国际化经验进行了探讨,并以博伊特勒书院为例,指出国际化办学思路、国际化师资、国际化教学氛围是推进我国现代书院国际化进程的重要抓手,提出了进一步提升书院国际化办学的建议,以期为我国高校书院制的国际化发展提供参考。2017年“基础学科拔尖学生培养试验计划”研究课题“本科生全方位导师制新模式的探索与研究”(20170402
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