一阶导数分光光度法测定血中一氧化碳含量的研究

本文通过理论推导及实验证明CO饱和血与正常血一阶导数的振幅高度比为一常数。将CO中毒检血氨稀释液取一半通CO至饱和,与另一半分别加入Na_2S_2O_4后在500～600nm测定一阶导数光谱在579nm处量出振幅值经计算可得CO在血中含量。     

新型手性Salen双核锌配合物的分子识别研究

合成了新型手性Salen配体（H3L）及新型手性Salen双核锌配合物（主体）.通过研究主体对咪唑类客体及氨基酸酯类客体的分子识别行为,测定了这些配位反应的缔合常数.主体对咪唑类客体分子识别的缔合常数顺序为:K(Im) >K(2-MeIm) >K(2-Et-4-MeIm).主体对氨基酸酯类客体分子识别的缔合常数顺序为:K(LeuOCH3) >K(ValOCH3) >K(AlaOCH3) >K(SerOCH3),配位数均为2.主体与D、 L型氨基酸酯分子识别反应在不同温度下的缔合常数结果表明,随着温度的升高,对映选择性下降.实验发现反应体系中存在焓熵补偿关系. CD光谱的研究结果也反映了主体对不同客体识别能力的差异.     

生物、土壤中痕量铜的催化分析

一、概述本世纪五十年代发展起来的动力分析法,特别是催化分析,已在生物化学、临床化学和其他方面得到广泛应用。近年关于微量铜的催化分析作了不少研究。其中有:Cu(Ⅱ)对Fe(Ⅲ)-硫脲反应或Fe(Ⅲ)-甲基硫脲反应,Cu(Ⅱ)对过氧化氢氧化氢醒或氧化靛胭脂以及Cu(Ⅱ)对Fe(CN)_6~(3-)-CN~-氧化还原反应的催化作用等。在多数情况下,干扰(如Hg(Ⅱ))难以排除,有的终点观测困难。本文提出的方法是根据Cu(Ⅱ)对反应的催化作用。为了能准确观测反应终点,我们在Fe~(3+)-S_2O_3~(2-)体系     

三价铟化合物在有机合成中的应用

综述了近年来三价铟化合物促进的多种有机反应及其在有机合成中的应用,其中重点讨论了三价铟化合物促进下的碳-碳键和碳-杂原子键的形成反应.     

离子液体介质中FeCl3•6H2O催化下芳香醛与5,5-二甲基-1,3-环己二酮的缩合反应

考察了在离子液体1-正丁基-3-甲基咪唑四氟硼酸盐([bmim][BF₄])介质中, 芳香醛与5,5-二甲基-1,3-环己二酮的缩合反应. 实验结果表明, 在催化量的FeCl₃•6H₂O存在下, 该反应可高产率地生成氧杂蒽二酮类化合物3; 而在TMSCl/FeCl₃•6H₂O复合催化体系的催化下, 则得到氧杂蒽二酮类化合物的开环衍生物4, 反应具有非常好的选择性. 该论文提供的方法操作简单、产率高、选择性好而且对环境友好. 在反应结束后, 所用催化剂及离子液体都很容易回收, 并能有效重复使用.     

漆树漆酶的催化氧化作用——Ⅳ.二茂铁及其衍生物的酶促氧化

In phosphate buffer-diethylene glycol monobutyl ether(DGBE), the oxidations of ferrocene and 15 derivatives were investigated in the presence of Rhus vernicifera laccase. The results showed that ferrocene and 11 derivatives can be oxidized. The mechanism of Laccase catalyzed oxidation of ferrocene was put forward.     

环氧丙烯酸酯的紫外光固化

制备了适于配制紫外光固化涂料的环氧丙烯酸酯，研究了反应温度、阻聚剂、催化剂等因素对环氧树脂与丙烯酸反应的影响；讨论了反应机理和动力学；并利用红外光谱观察了产物的紫外光固化行为。季铵盐能有效地催化环氧树脂和丙烯酸的反应，当其用量为０．６％～１．２％时，在９０～１１０℃反应４．５～８小时后，环氧基转化率大于９７％。由此配制的光固化涂料经紫外光辐照能快速固化。     

中国不同类型土壤中稀土元素的形态分布特征

采用中子活化分析地中国不同地带土壤中的稀土元素含量分布模型及其赋存形态进行了系统的研究。结果表明，黄棕壤，褐土，淋溶黑钙土及白浆土中稀土元素的分布均为轻稀土富集，Ｅｕ亏损型，砖红壤，红壤为轻稀土富集，Ｃｅ亏损型。     

STUDY ON THE SYNTHESIS OF POLYPERFLUOROTRIAZINE——The Synthesis and Polymerization of a Novel α,ω-Diiodoperfluorooxaalkyl s-Triazine Monomer*

In order to investigate synthetic route of polyperfluorotriazine elastomer, 2-trifluoromethyl4,6-bis(4′-iodo-2′-oxahexafluorobutyl)-1,3,5-triazine (1), a novel triazine monomer, was synthesized from 5-iodo-3-oxa-octafluoropentanesulfonyl fluoride (2) in eight-steps. 2 was reduced by potassium sulfite to the sulfinate (3), which was treated with hydriodic acid to yield 5-iodo-3oxa-hexafluoropentanoic acid (4). Compound 4 was transformed to 5-iodo-3-oxa-hexafluoropentanenitrile (7) through the corresponding ester 5 and amide 6. The desired product 1 was prepared by acylation-cyclodehydration of the imidoylamidine 9, obtained by condensation of the nitrile 7 with the amidine 8.The various methods for the esterification of perfluorocarboxylic acid were studied and a possible mechanism for the transformation of perfluorosulfinate to the corresponding perfluorocarboxylic acid by hydriodic acid was proposed.Crude 1 contained compounds 6, 11, 13, as impurities which were removed by low temperature crystallization followed by filtration through a short alumina column. The monomer 1 was polymerized by UV-irradiation in the presence of Hg with or without solvent. Polyperfluorooxaalkyl triazine 17 thus obtained showed good thermal stability. In the main chain of the polymer there was no weak unit of the uncyclized ring. Polymer 17 had an average molecular weight of ca. 1.33—2.0×10~4 (D. P.=27—42) and the temperature of 10% weight loss in nitrogen was 340℃.     

Highly Efficient One-Pot Synthesis of 2-Arylmethyl N-Substituted Anilines via Yb（OTf）3 Catalyzed Three-Component Reaction

An efficient method has been developed for one-pot three-component coupling reactions of various aldehydes, 1-cyclohexen-2-one, and primary or secondary amines in the presence of a catalytic amount of Yb（OTf）3 under mild conditions to afford the corresponding 2-arylmethyl N-substituted anilines in good yields. In addition, the catalyst was easily recovered and could be reused for at least four cycles without any loss of activity.