Chiral Phosphine Ligands Derived fro m Sugars .14 . Crystal Structure of Diphenyl( m ethyl4’,6’-O-benzylidene-3’-deoxy-α- D-altropyranoside-3-)phosphine Oxide

１　ＩＮＴＲＯＤＵＣＴＩＯＮＣｈｉｒａｌｐｈｏｓｐｈｉｎｅｓａｒｅｕｓｅｆｕｌｌｉｇａｎｄｓｉｎｅｎａｎｔｉｏｓｅｌｅｃｔｉｖｅｃａｔａｌｙｓｉｓｗｉｔｈｔｒａｎｓｉｔｉｏｎｍｅｔａｌｃｏｍｐｌｅｘｅｓ〔１〕，ｓｏｍｅｏｆｔｈｅｍｄｅｒｉｖｅｄｆｒｏｍｓｕｇａｒｓａｒｅａｌｓｏｏｆｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｓｉｎｂｉｐｈａｓｉｃｃａｔａｌｙｓｉｓ〔２〕ａｎｄｍｅｄｉｃｉｎｅ〔３〕．Ｂｙｔｈｅｎｕｃｌｅｏｐｈｉｌｉｃｒｅｐｌａｃｅｍｅｎｔｒｅａｃｔｉｏｎ，ｉｔｉｓｄｉｆｆｉｃｕｌ…     

亚微米分子筛粒径与性能的关联研究

对实验室合成的不同粒径的NaY分子筛进行了性能研究,表明比表面积、酸量随着粒径的减小而增加,粒径太小的分子筛其稳定性、活性低,不能满足FCC催化剂的使用要求,应用于FCC催化剂的分子筛合适粒径为500nm～800nm.     

Theoretical Study on the Intermolecular Interactions of Tetrazole Dimers

1 INTRODUCTION Tetrazole and its derivatives are widely applied in the fields of agriculture, biology, chemistry, phar- macology and photographic technology, and they play significant roles in the science and technology as well as national defence[1]. In the past, the res- earches were focused on the molecular geometries, electronic structures, IR, thermodynamic properties, tautomerization, pyrogenation and sensitivity of tetrazole compounds[1～5]. However, study of tetra- zole dimers ha…     

Template Syntheses and Crystal Structures of Hexaaza Macrocyclic Complexes with C-Methyl Substituents

1 INTRODUCTION Polyaza-macrocyclic compounds with functional substituents have been extensively investigated recen- tly because of their potential applications in radioac- tive therapy, recovery of metal ions, biomimetic che- mistry, and catalysis[1, 2]. With various structures and distinctive properties, they have become significant building blocks for further chemical studies[3～6]. As far as the preparation method is concerned, metal template condensation reactions are shown to be effec…     

Synthesis, Crystal Structure and Antibacterial Activities of 3-[3-Methyl-（2-thienyl）methyl-enehydrazinocarbonyl]-（1H）-1,2,4-triazole

1 INTRODUCTION Azole derivatives, such as the derivatives of pyra- zole, imidazole, triazole including benzotriazole, te- trazole and indole, have extensive biological activi- ties. They have become the central focus of studies of agricultural chemicals, medicines, plant growth regulating agents and so on[1, 2]. Schiff bases also constitute a good type of biologically active sub- structures. Studies on pyrazole Schiff base-type fun- gicides have been reported[3, 4]. However, some struc- …     

Spectral Parameters of Nd^3＋ Ion in Nd^3＋：KLu（WO4）2 Crystal

1 INTRODUCTION There has been increasing interest in the re-search of diode laser-pumped solid-state lasers in re-cent years because of the rapid development of highpower diode lasers. Nd:YAG and Nd:YVO crystalsare commercially available, but limited to low Nd3 (= 1 at.%) doping concentration and to narrow ab-sorption bands near the diode emission wavelengthof 808 nm. Therefore, it is necessary to explore moreefficient crystal materials for diode-pumped solid-state lasers. The alkali …     

Synthesis and Characterization of （CH3CH2CH2CH2NH3）2SnBr6

1 INTRODUCTION Recently, the researches on inorganic-organic hy-brid compounds represent an advanced field in mate-rial science[1]. At the molecular level, the combina-tion of two extremely different components providesan avenue to design new hybrid materials as well asthe ability to modulate properties of one or more ofthe components[2～6]. Some attractive properties, suchas efficient luminescence[2～4], ideal thermal and me-chanical stability, interesting magnetic[5], non-linearoptical[…     

Synthesis and Crystal Structure of the Derivative of Hydroquinone from Mannich Reaction

1 INTRODUCTION Mannich reaction plays an important role in theconstruction of a large variety of nitrogen-containingmolecules, for instance, some pharmaceuticals andnatural products[1, . In practice, phenols and naph- 2]thanols can serve as the substrate of Mannich reac-tion to obtain aminomethylate by the treatment withformaldehyde and amines or nitrogen heterocycliccompounds[3～5]. We report herein the synthesis andcrystal structure of a new nitrogencontaining co…     

Synthesis and Crystal Structure of a Novel Tetranuclear Manganese(II) Complex with a Tripodal Peptide Ligand

1 INTRODUCTION Amides play an important role in the evolution ofnature. The amidate participates in the coordinationof iron with the ligands containing biomolecules, suchas antitumor drug bleomycin[1] and nitrile hydra-tase[2]. Bleomycin is a clinically useful antitumoragent which catalyzes the cleavage of oxidative DNAand oxidizes a number of organic substrates with di-oxygen or H2O2 . This has raised more interest in [3]the coordination of amide complexes[4, . …     

基于加权方差估计的降维

提出一种新的降维方法, 加权方差估计(WVE), 它包含了切片平均方差估计(SAVE)作为特例. 并且利用Bootstrap方法从WVE中 选择出最优估计, 给出了维数的选择方法. 该最优估计通常远好于已有方法, 比如切片逆回归(SIR)等. 已有的许多方法, 如SIR, SAVE等, 通常对每个 观测给予相同的权来估计中心子空间(CS). 通过引入权函数, WVE根据观测样本距中心子空间的距离, 对不同观测给予不同权重. 权函数使得WVE在很 一般或复杂的情形下有很好的表现, 比如, 回归变量的分布严重偏离椭圆对称分布. 而椭圆对称分布假设是许多方法 的基本假定, 如SIR, SAVE等. 和已有方法相比, WVE对自变量的分布不敏感. 本文建立了WVE的相合 性. 与其他方法的模拟比较表明了WVE的优点.