NEW METHODS FOR THE PREPARATION OF SULFOXIMINES

Abstract

Three methods that have been developed in our laboratory for the preparation of sulfoximines are described. Two of these involve the efficient, high yield oxidation of certain sulfilimines (iminosulfuranes) with ruthenium tetroxide (catalytic Ru0₂ + sodium periodate or hypochlorite cooxidant) and m-chloroperoxybenzoic acids, respectively, in biphasic systems. The third method is the direct preparation of sulfoximines from DMSO-t-butyl hypochlorite-aromatic amines. The scope and limitations of the procedures will be described.     

生物降解原油研究的新方法

利用沥青质包裹烃和沥青质钌离子催化氧化（RICO）产物中的生标对生物降解原油进行了研究。研究表明，虽然原油中的生标受到了严重破坏，但利用这两种方法在沥青质中均可以获得较为完整的生标系列。与其它方法相比，这两种方法简单方便，结果较为可靠、准确，可能是生物降解原油研究的发展方向。     

两种采样方法检测空气中偏二甲肼含量的精密度检验

以自制的偏二甲肼动态配气系统配制已知浓度空气样品为测试环境,采用溶液吸收法采样并简化了G JB2373-1995的分析步骤,使用改进方法与标准方法分别进行实验。用F检验法比较两种方法所对应的两组检测数据,结果表明,两种方法的精密度相当,而溶液吸收法省时、省力。     

A CONVENIENT IRRADIATION CELL FOR FERRIOXALATE ACTINOMETRY

Abstract— A calibrated volumetric optical cuvette is described which both simplifies the technique and improves the precision of potassium ferrioxalate actinometry. The cuvette is used both for irradiation of the actinometer solution and for in situ dilution and chemical developing of the irradiated aliquot. The technique permits all but one manipulation to be carried out in total darkness, thus protecting the actinometer solutions from ambient light. The method can be extended to any actinometric procedure and the volumetric cuvettes are very useful in a variety of other spectrophotometric applications.     

TWO NEW FORMULAS FOR TRIANGULATION NUMBER T

The present paper reports two [new formulas for calculating triangulation number T.They are T =L~2/l~2 and T = 1.45r~2/l~2, where L is the distance between pentons, l the distancebetween any two adjacent capsomeres, r the radius of viral nucleocapsid. The formulas havebeen verified and applied. It is worth noticing that the triangulation number, viral size anddistance between capsomeres are fully connected by the formula r/(Tl)~(1/2) = 0. 83, and the capsidparameters of all icosahedral viruses are unified in one constant, 0.83.     

两种新型的分光光度法

介绍了两种新型的分光光度法:“正滴光度法”和“剩余光度法”。     

THE INVESTIGATION OF MONOMER SYNTHESIS METHODS FOR POLYSULFONES AND OTHER NEW CLASSES OF SULFUR-CONTAINING POLYMERS

Abstract

Polysulfones, the new promising class of sulfur-containing polymers, are produced by aromatic nucleophilic and electrophilic substitution reactions. The first way is based on 4,4′-dichlorodiphenylsulfone (DCDPS) application as one of the basic monomers, which can be produced by three technical methods, utilizing strong sulfonating and sulfonylating agents. The reaction of hydrocarbon sulfonylation with arylsulfochlorides in the presence of small quantities of Fe chloride (kinetics, mechanism, the reactivity of initial compounds) was investigated in detail. For the first time the competitive inhibiting by initial and final products was found in this reaction, and its quantitative evaluation was given. The data obtained allowed to explain the experimentally observed anomalous reactivity of arylsulfochlorides. The chemistry of sulfonylation reaction with stabilized liquid sulfuric anhydride and dimethylsulfate was thoroughly investigated. The peculiarities and application limits of substituted diphenylsulfones synthesis methods were discussed.     

硒的分析方法

就近年来国内外硒的分析方法进行了综述，着重介绍了吸光光度法、荧光光度法、原子吸收光谱法、电化学分析法（引用文献37篇）。     

铍的分析方法进展

综述了1989-1999年来国内外铍的吸光光度法、原子吸收光谱法及原子发射光谱分析法等的研究进展。     

两种新型植物激素燃烧热的测定及生成焓的计算

本文报道了用精密转动弹量热计测定两种新型植物激素２－［（２－氯苯胺基）羰基］苯甲酸与Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）的配合物的燃烧热，换算得Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）配合物的－△ｃＨ＾×ｍ分别为１１８８１．１±６．９，１３２０６．７±７．５ｋＪ·ｍｏｌ＾－１，计算得它们的－△ｆＨ＾×ｍ分别为２０５０．５±６．９，６３９．７±７．５ｋＪ·ｍｏｌ＾－１。     

NON-ENZYMIC METHODS FOR THE PHOSPHORYLATION OF PROTEINS1

Abstract

Non-enzymic methods for the phosphorylation of proteins are reviewed with respect to type of reagent, protein source, reactive site (N[sbnd], O[sbnd] or S[sbnd]), extent of reaction, and effect on physical properties, functionality and biological properties. Experimental procedures are given to illustrate the most important methods. Some enzymic methods are included for comparison. The evidence for phosphorylation of specific amino acid residues, such as serine, threonine, histidine or lysine, is critically assessed. Conclusions are drawn regarding the status of phosphorylation as a synthetic method for modifying proteins.     

溶液电导率的绝对测量方法

概括论述了三种溶液电导率绝对测量方法：基于精确测量电导池几何参数的测量方法、基于电容测量的溶液电导率测量方法和基于Van Der Pauw方法的溶液电导率测量方法。前一种方法用于许多国家的溶液电导率基准测量,后两种方法可发展为溶液电导率测量的基;住方法。     

两种褐煤快速热解的非等温动力学

用电加热金属丝网装置在氮气气氛下对我国两种褐煤进行了快速热解,从实验结果计算了基于单一反应模型和多重反应模型的非等温动力学参数。结果表明,模型参数均与煤种和加热条件有关.多重反应模型参数较好地符合其物理含义。两种模型均能成功地预测热解过程。     

SYNTHESIS OF TWO STABLE DIPHOSPHENES WITH A NEW STABILIZING SUBSTITUENT

Abstract

Two new diphosphenes 7 and 10 have been synthesized by action of DBU on trichlorogermylphosphines 4 and 8; this route involves the intermediate formation of chlorophosphines 5 and 9. Diphosphenes 7 and 10 are stabilized by the 2,6-bis(trifuoromethyl)phenyl group which presents both steric and electronic effects and is used for the first time in phosphorus chemistry.     

CONVENIENT SYNTHETIC METHODS FOR THE PREPARATION OF N-FLUOROALKYLHYDROXAMIC ACIDS

ABSTRACT

Polyhydroxamate chelators containing fluoro substituents are of interest as potential extractants for actinides in separations involving supercritical carbon dioxide. In this context, we have developed three new reagents 1, 2, and 3, that allow the efficient incorporation of an N-fluoroalkyl hydroxamate moiety onto a variety of substrates using acylation, alkylation, and Michael addition strategies.     

TWO NEW SAPONINS FROM MUSSAENDA PUBESECUS

ＴＷＯ　ＮＥＷ　ＳＡＰＯＮＩＮＳ　ＦＲＯＭ　ＭＵＳＳＡＥＮＤＡ　ＰＵＢＥＳＥＣＵＳＴＷＯＮＥＷＳＡＰＯＮＩＮＳＦＲＯＭＭＵＳＳＡＥＮＤＡＰＵＢＥＳＥＣＵＳ￥ＷｅｉＭｉｎＺＨＡＯ；ＪｕｎＰｉｎｇＸＵ；ＧｕｏＷｅｉＱＩＮａｎｄＲｅｎｓｈｅｎｇｘｕ（Ｓｈａ...     

新型铈组稀土显色剂对乙酰基偶氮胂两类显色反应的研究

本文探讨了两类显色反应的特点和转化关系,并测定了两种络合物的组成。     

NEW METHOD FOR GENERATION OF t-BUTYL PERFLUOROALKYL NITROXIDES

Electron transfer reactions between O-benzoyl t-butylhydroxyl-amine,t-BuNHOCOPh(1)and perfluorodiacyl peroxides(RfCO_2)_2(2)mayserve as a novel method for generating useful t-hutyl perfluoroalkylnitroxldes at room temperature in CFCl2-CF2Cl.     

测定诺氟沙星胶囊的新方法

诺氟沙星(Norfloxacinium)是近几年合成的新抗菌素(图1)。具有抗菌谱广,疗效好,毒性低等优点。目前已广泛应用于临床。中国药典1990年版中对诺氟沙星胶囊的含量测定采用非水滴定法。本文改进了此法,采用紫外分光光度法测定该品种含量。实验表明该法简便、快速、重现性也较好。仪器与试药仪器:日本岛津UV-2100紫外分光光度计;日本岛津UV—260紫外分光光度计;751—GW(上海分析仪器厂)。