双磷配体的合成及铑—双磷配体催化剂为混合辛烯氢甲酰化反应的催？…

合成了具有不同电子效应的３种双膦配体。其给电子性为Ｐｈ２Ｐ（ＣＨ２）４ＰＰｈ２〉Ｐｈ２Ｐ（Ｏ）（ＣＨ２）４ＰＰｈ２〉Ｐｈ２Ｐ（Ｏ）（ＣＨ２）４Ｐ（Ｏ）Ｐｈ２。这３种配体与醋酸铑二聚体配合物构成的催化剂,在混合辛烯的均相氢甲酰化反应中表现出的活性和选择性与配体给电子性强弱的次序完全相反。我们认为,具有弱配位性的「Ｒｈ（ＣＨ３ＣＯＯ）２」２Ｐｈ２Ｐ（Ｏ）（ＣＨ２）４Ｐ（Ｏ）Ｐｈ２催化体系,因其形成的活     

FeCo2(CO)7(μ3-S)(O[P(SCH2)2]2)的合成与晶体结构

许多化学工作者对单齿膦配体（ＰＰｈ３,ＰＢｕｎ３,ＰＥｔ２Ｐｈ,Ｐ（ＯＥｔ）３,Ｐ（ＯＣ６Ｈ５）３）与母体簇合物ＦｅＣｏ２（ＣＯ）９（μ３－Ｓ）的取代反应进行过详细研究［１－３］,但对双齿膦配体与母体簇合物的取代反应研究报导较少．Ａｉｍｅ［４］合成了含双齿膦配体的簇合物ＦｅＣｏ２（ＣＯ）７（μ３－Ｓ）（Ｐｈ２ＰＣＨ２ＰＰｈ２）,并用１３ＣＮＭＲ和ＩＲ光谱方法对其结构进行了表征．到目前为止,含双齿膦配体的该类簇合物的晶体与分子结构还未见报导．ＲｏｓａｎｎａＲｏｓｓｅｔｔｉ［２］通过研究母体簇合物与…     

KI-醚类催化剂催化二氧化碳和环氧乙烷合成碳酸乙烯酯反应研究

合成了５个含有金属铁的环醚Ｆｅ（ＣＯ）３Ｌ（Ｌ１＝Ｐｈ２Ｐ（ＣＨ２ＣＨ２Ｏ）２ＣＨ２ＣＨ２ＰＰｈ２，Ｌ２＝Ｐｈ２Ｐ（ＣＨ２ＣＨ２Ｏ）４ＣＨ２ＣＨ２ＰＰｈ２，Ｌ３＝ＯＰｈ［（ＯＣＨ２ＣＨ２）ＰＰｈ２］２，Ｌ４＝ＯＰｈ［ＯＣＨ２ＣＨ２）２ＰＰｈ２］２）和［Ｆｅ（ＣＯ３）］２Ｌ５（Ｌ５＝［Ｐｈ２ＰＣＨ２ＣＨ２ＯＣＨ２ＣＨ２ＰＰｈ２］２）．对它们进行了元素分析，并用红外光谱和核磁共振谱进行了结构表征．用ＫＩ＋醚类为催化剂，催化二氧化碳与环氧乙烷反应生成碳酸乙烯酯，反应选择性大于９６．９％．催化机理为碱催化，催化剂的活性受醚的影响．能和Ｋ＋形成稳定配合物的醚可提高催化剂的活性．含金属铁的环醚和普通醚类相似，可以和钾离子作用，提高阴离子的亲核催化性能．     

亚胺膦钌配合物RuCl2P2N2的合成和催化性能

ＲｕＣｌ２（Ｐｈ３Ｐ）４或ＲｕＣｌ２（ＤＭＳＯ）４在甲苯中直接与等摩尔的亚胺膦配体Ｎ，Ｎ－双－［邻－（二苯基膦苯亚甲基）］乙二胺（Ｐ２Ｎ２）在甲苯中回流反应，高产率地合成了反式配位的双亚胺双膦钌配合物ｔｒａｎｓ－ＲｕＣｌ２Ｐ２Ｎ２．在温和条件下，该配合物作为新型催化剂有效地催化α，β－不饱和酸和几种功能团烯烃的选择加氢反应．讨论了可能的催化活性物种．     

含膦,氮配体的混合膦酸锆—钯催化剂的研制

用氯化二苯基膦为膦化试剂,首次对多乙烯多胺乙基膦酸－磷酸氢锆Ｚｒ（ＨＰＯ４）１．３５（Ｏ２ＰＣＨ２ＣＨ２（ＮＨＣＨ２ＣＨ２）ｍＮＨ２）０．６５·Ｈ２Ｏ（ＺＰ－ＰＥＰＡＥＰＡ,ｎ＝０,１,２,３,４）载体表面进行二苯基膦化,合成了一类含膦氮配体的新型混合膦酸锆载体及负载钯催化剂。研究了有机膦酸侧链不同链长和Ｐｈ２ＰＣｌ用量对配体载体制备的影响,并用ＩＲ,ＴＧ,ＤＴＧ,ＤＴＡ对这类载体及催化剂进行表征     

SiO_2负载的Pt－M、Rh－M异双核络合物催化剂催化CO_2氢化反应

考察了ＳｉＯ２负载的（ＰＰｈ３）２ＨＰｔ（μ－ＣＯ）（μ－ＰＰｈ２）Ｍ（ＣＯ）４和（ｄｐｐｅ）Ｒｈ（μ－ＣＯ）２Ｍ（ＣＯ）３（Ｍ＝Ｃｒ、Ｍｏ、Ｗ；ｄｐｐｅ＝Ｐｈ２Ｐ（ＣＨ２）２ＰＰｈ２）异双核络合物催化剂催化ＣＯ２氢化反应的活性和选择性．两者皆表现出较高的催化活性和含氧化合物选择性，而前者比后者更好．     

顺丁烯二酸酐均相配位催化氢化反应研究

研究了在室温和大气压力下，几种过渡金属络合物对顺丁烯二酸酐氢化生成琥珀酸酐的催化活性，实验结果表明，它们的催化活性顺序是：ＰｄＣｌ２（ＰｈＣＨ２ＣＮ）２〉ＲｕＣｌ２（ＰＰｈ３）３〉ＰｄＣｌ２（ＰｈＣＮ）２〉ＰｄＣｌ２（ＰＰｈ３）２＝ＲｈＣｌ（ＰＰｈ３）２，在所应用的反应条件下，其中催化活性最高的络合物，ＰｄＣｌ２（ＰｈＣＨ２ＣＮ）２，给出了琥珀酸酐的产率高达９３．０％。     

[（C5H4CH3）2HoN4cpH]2.[（C5H4CH3）（C5H5）HoN4CPh]2的合成和晶体结构2

（Ｃ５Ｈ４ＣＨ３）３Ｈｏ和（Ｃ５Ｈ４ＣＨ３）２Ｈｏ（Ｃ５Ｈ５）与５－本基四唑在ＴＨＦ中反应，得到了复合产物「（Ｃ５Ｈ４ＣＨ３）２ＨｏＮ４ＣＰｈ」２．「（Ｃ５Ｈ４ＣＨ３）（Ｃ５Ｈ５）ＨｏＮ４ＣＰｈ」２，该晶体属三斜晶系，Ｐ１空间群，晶胞参数为ａ＝９．３８６（３），ｂ＝１３．０７１（３），ｃ＝１６．５７１（２）Ａ，α＝８６．９０（１），β＝７４．６１（２），γ＝７７．３０（２）°，Ｖ＝１９１２．８（８     

Cu2I2(PPh3)3.DMF的合成和晶体结构

Ｃｕ２Ｉ２（ＰＰｈ３）３·ＭＤＦ（Ｐｈ＝Ｃ６Ｈ５,ＤＭＦ＝ＨＣＯＮ（ＣＨ３）２是通过Ｗ２Ｓ４（Ｓ２ＣＮ－（ＣＨ２ＣＨ２ＯＨ）２）２,ＰＰｈ３和ＣｕＩ在ＣＨ２Ｃｌ２和ＤＭＦ为溶剂,在室温条件下合成的晶体产物。其窨群为Ｐ２１／Ｃ,晶胞参数：Ｃ５７Ｈ５２Ｃｕ２Ｉ２ＮＯＰ３,α＝１５．８６３（５）,ｂ＝１９．６１９（７）,ｃ＝１８．２３２（４）,Ａ,β＝１０９．５３（２）°,Ｖ＝５３４８（３）Ａ＾３,Ｚ＝     

杂核簇合物μ_3－CphCoMM＇的合成及结构表征

本文利用等电子金属碎片交换法，由μ３－ＣＰｈＣｏ３（ＣＯ）９（１）与ＮａＭ（ＣＯ）３Ｃｐ’（Ｍ＝Ｍｏ，Ｗ；ＣＰ’＝ＣＨ３Ｃ５Ｈ４）反应根到μ３－ＣＰｈＣｏ２Ｍ（ＣＯ）８ＣＰ’（２ａ，ｂ），μ３—ＣＰｈＣｏＭｏ２（ＣＯ）７Ｃｐ＇２（４），再由２ａ与Ｎａ２［Ｆｅ（ＣＯ）４］反应得到手征性簇合物μ３－ＣＰｈＦｅＣｏＭｏ（ＣＯ）２ＣＰ＇Ｈ（３），对合成的簇合物进行了元素分析、ＩＲ、１ＨＮＭＲ．ＭＳ分析表征．     

非那雄胺合成工艺改进

非那雄胺能抑制5α-还原酶的活性,明显降低二氢睾酮水平,是一种治疗良性前列腺增生的有效药品。该合成工艺以甾烯酮酸为原料,将其与氯化亚砜反应,无须分离即与叔丁胺反应得17β-酰胺化合物,再氧化开环,环合,氢化,脱氢合成了非那雄胺。经元素分析、IR、1HNMR、13CNMR、MS分析表征了其结构。该法无须使用昂贵的2,2-二吡啶二硫化物和剧毒药品苯亚硒酸酐,且以乙酸铵代替氨气,降低了对设备的要求和腐蚀,更适用于工业生产。     

Dichroism of absorption and polarization of phosphorescence of molecules of the closed form of nitrobenzospirothiopyran

The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.     

Acid hydrolysis of carboxymethylcellulose of low degree of substitution

Cotton cellulose was swollen in a sodium hydroxide solution and carboxymethylated by a two-bath method for different periods of time for each process. The kinetics of acid hydrolysis and the crystallinity of the swollen and carboxymethylated samples were measured. The proportion of broken bonds, rate constants for hydrolysis, and permeability of cellulose to hydrolyzing agents were calculated. The susceptibility of glycosidic linkages to acid hydrolysis was improved by carboxymethylation more than by swelling in alkali. The increased accessibility of carboxymethylcellulose to acid was regarded as a consequence of increased intra-and intercrystalline swelling and of the glycosidic bonds' weakness caused by the electron-attracting carboxymethyl group on the C-6 position.     

恶臭嗅辨实验室建设探讨

针对恶臭测试的环境影响问题,提出了解决的实例方案,并对方案的要点及优缺点进行讨论,此方案在实际操作中具有较好的效果。     

Estimation of Kinetic Parameters of Thermal Oxidation of Ilmenite

The aim of the presented work was the investigation of thermal oxidation of ilmenite in static air atmosphere. The investigations were carried out by use of a derivatograph (MOM, Hungary). The changes of crystallographic structure of investigated samples were identified by X-ray diffractometry on Philips PW-1710 diffractometer. In temperature above 500°C appears structure of hematite Fe₂O₃. On the basis of the thermogravimetric measurements, the contracting area and contracting volume models were found as the best fitting experimental data. This revised version was published online in August 2006 with corrections to the Cover Date.     

Mechanism of action of base-catalyzed oxygenation of phenol derivatives

Cyclopropyl derivative of 2,6-di-tert-butylphenol is synthesized as a probe to investigate the mechanism of base-catalyzed autooxidation of phenol derivatives. Our study indicates that one electron reduction of molecular oxygen from phenolate gives phenoxyl radical 3, a key intermediate of autooxidation. The coupling of phenoxyl radical and superoxide radical gives peroxylate anion 4 and produces the final epoxy alcohol adduct 6.     

氯氧化镁生成热的研究

用氧化镁氯化镁水溶液制备了8水合氯氧化镁[nMg(OH)2·MgCl2·8H2O], 并测定了其在盐酸中的溶解热, 实验结果表明, 氯氧化镁溶解热与n值呈线性关系, 根据溶解热求出5Mg(OH)2·MgCl2·8H2O和3Mg(OH)2·MgCl2·8H2O的生成热分别为-7727.1和5888.1kJ·mol^1^-。     

化学计量中不确定度评定研究进展

测量不确定度是表征合理地赋予被测量之值的分散性的参数。本文针对化学计量不确定度评定基础模型仅适用于线性模型、概率分布为正态分布或缩放位移t分布等局限,介绍了近年来不确定度评定的研究热点:蒙特卡罗方法(Monte Carlo Method,MCM),不确定度评定的来源、评定概念、评估方法及其发展过程,扩大了测量不确定度评定与表示的适用范围。     

微量钙的测定方法研究进展

介绍了1995-2006年期间测定微量和痕量钙的方法,如电感耦合等离子体-原子发射光谱法、原子吸收光谱法以及离子色谱法等的工作原理和特点,并说明了其测定微量钙的应用领域。并对微量钙的测定技术进行了展望(引用文献55篇)。     

Stages of thermal decomposition of sodium oxo-salts of sulphur

Thermal behaviour of sodium oxo-salts of sulphur: Na₂SO₄, Na₂S₂O₇, Na₂S₂O₆, Na₂SO₃, Na₂S₂O₅, Na₂S₂O₄, Na₂S₂O₃, Na₂S₃O₆ and of sulphides Na₂S and Na₂S₂ was studied on heating up to 1000°C. The experiments were performed with anhydrous compounds obtained from commercial products by recrystallisation and dehydration. The stage mechanisms of decomposition of anionic sub-lattices of the salts have been proposed basing on the Górski’s morphological classification of simple species. The thermal stability and the stage decomposition mechanisms were correlated with the structure and the potential chemical properties of the salt anions. The thermal decomposition processes were studied by means of thermal analysis, and the decomposition products were identified by means of X-ray phase analysis.